<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:f9a34334-adef-4b56-820f-080c6de1ef13,g:70a778a2-9483-45f7-a15e-2249b362e778-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://capitalbankmd.com/role/ConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="cbnk-20210930.xsd#ConsolidatedStatementsofIncome"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/ConsolidatedStatementsofIncome" xlink:type="extended" id="if47f0c3221524d529a1510e3e703eccf_ConsolidatedStatementsofIncome">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_acfcb6c5-e26d-4087-9661-1f7fab6f5d24" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperatingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_acfcb6c5-e26d-4087-9661-1f7fab6f5d24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_6a525c5c-2de9-4bfb-a38a-5e269c1fb2e7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_acfcb6c5-e26d-4087-9661-1f7fab6f5d24" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_6a525c5c-2de9-4bfb-a38a-5e269c1fb2e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating_8e01d2f8-9c85-477b-b05b-521bba6ced97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_acfcb6c5-e26d-4087-9661-1f7fab6f5d24" xlink:to="loc_us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating_8e01d2f8-9c85-477b-b05b-521bba6ced97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeFederalFundsSold_a52bc0fa-6144-4c75-a952-c2fce58e2666" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeFederalFundsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_acfcb6c5-e26d-4087-9661-1f7fab6f5d24" xlink:to="loc_us-gaap_InterestIncomeFederalFundsSold_a52bc0fa-6144-4c75-a952-c2fce58e2666" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_49dfbf70-25a1-45ee-9fb2-64bc322792ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_acfcb6c5-e26d-4087-9661-1f7fab6f5d24" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_49dfbf70-25a1-45ee-9fb2-64bc322792ea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseAbstract_50138cda-b8b2-4fac-b6b4-bcfe34e1be8e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_InterestExpenseAbstract_50138cda-b8b2-4fac-b6b4-bcfe34e1be8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDeposits_c1a8f47e-bad7-4eff-ae06-4a61c6419af4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_50138cda-b8b2-4fac-b6b4-bcfe34e1be8e" xlink:to="loc_us-gaap_InterestExpenseDeposits_c1a8f47e-bad7-4eff-ae06-4a61c6419af4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseBorrowings_507a11bf-7d1d-4941-85b8-10bc20661496" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_50138cda-b8b2-4fac-b6b4-bcfe34e1be8e" xlink:to="loc_us-gaap_InterestExpenseBorrowings_507a11bf-7d1d-4941-85b8-10bc20661496" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_9cc7dff5-55be-4293-96a1-3d2de2c558a6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_50138cda-b8b2-4fac-b6b4-bcfe34e1be8e" xlink:to="loc_us-gaap_InterestExpense_9cc7dff5-55be-4293-96a1-3d2de2c558a6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_c3a8b035-64e2-49ae-b53e-6827e510ddfd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_c3a8b035-64e2-49ae-b53e-6827e510ddfd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_cd7b0938-c64e-47ad-9034-bc3d395d59d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_cd7b0938-c64e-47ad-9034-bc3d395d59d6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_ec916a3f-8fad-4588-98bb-c7b8005cdbe4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_ec916a3f-8fad-4588-98bb-c7b8005cdbe4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeAbstract_6c22fc2a-3d94-4793-a566-c92fd51b8397" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_NoninterestIncomeAbstract_6c22fc2a-3d94-4793-a566-c92fd51b8397" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_4b10c3da-7c84-4e8d-938e-6b830ba3cad3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_6c22fc2a-3d94-4793-a566-c92fd51b8397" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_4b10c3da-7c84-4e8d-938e-6b830ba3cad3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_663ba1ed-d735-4340-b5c9-f59c8894fc09" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_6c22fc2a-3d94-4793-a566-c92fd51b8397" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_663ba1ed-d735-4340-b5c9-f59c8894fc09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_f12c9834-cd8e-43d0-93f6-e7ee12f0fd2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeOtherOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_6c22fc2a-3d94-4793-a566-c92fd51b8397" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_f12c9834-cd8e-43d0-93f6-e7ee12f0fd2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_e04c2555-a60a-47fa-9ce4-8bd3c6ffb1ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_6c22fc2a-3d94-4793-a566-c92fd51b8397" xlink:to="loc_us-gaap_NoninterestIncome_e04c2555-a60a-47fa-9ce4-8bd3c6ffb1ad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_87421251-a5e3-4139-8167-2576a7523a09" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_us-gaap_LaborAndRelatedExpense_87421251-a5e3-4139-8167-2576a7523a09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OccupancyAndEquipmentExpense_f65b6bb1-9cc0-4bd0-9e2f-159e3f7b3223" xlink:href="cbnk-20210930.xsd#cbnk_OccupancyAndEquipmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_cbnk_OccupancyAndEquipmentExpense_f65b6bb1-9cc0-4bd0-9e2f-159e3f7b3223" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_6d372d03-fe3e-497f-a109-82ab0da28228" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfessionalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_us-gaap_ProfessionalFees_6d372d03-fe3e-497f-a109-82ab0da28228" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_0f914f36-595a-4724-b817-08298fc94383" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InformationTechnologyAndDataProcessing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_0f914f36-595a-4724-b817-08298fc94383" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_1b186896-9882-4d1f-a28d-0b65efdb6e66" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_us-gaap_AdvertisingExpense_1b186896-9882-4d1f-a28d-0b65efdb6e66" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanProcessingFee_b8f24053-52c0-46dc-af25-bbee766b03c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoanProcessingFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_us-gaap_LoanProcessingFee_b8f24053-52c0-46dc-af25-bbee766b03c0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherRealEstateExpensesNet_3b1c5e33-1290-471f-9119-ac133f085b66" xlink:href="cbnk-20210930.xsd#cbnk_OtherRealEstateExpensesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_cbnk_OtherRealEstateExpensesNet_3b1c5e33-1290-471f-9119-ac133f085b66" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_fb6c2cc6-30eb-4d09-8e6c-9c8cee820f62" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_us-gaap_OtherNoninterestExpense_fb6c2cc6-30eb-4d09-8e6c-9c8cee820f62" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_1d7d793c-7b28-4b3d-8d6b-b2b77a457215" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_83381610-b6f0-4480-8144-f9ac82e41d3d" xlink:to="loc_us-gaap_NoninterestExpense_1d7d793c-7b28-4b3d-8d6b-b2b77a457215" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_ae8aa2b8-fc9d-4f14-adff-53fe768b01ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_ae8aa2b8-fc9d-4f14-adff-53fe768b01ad" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_9b35f106-9349-4aa6-ae17-210b83a72995" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_9b35f106-9349-4aa6-ae17-210b83a72995" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_15c3899e-a608-4e19-a9b2-54c9347ec652" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_NetIncomeLoss_15c3899e-a608-4e19-a9b2-54c9347ec652" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_9ff2ffbc-6424-452e-81f6-9d11d6e72c2a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_EarningsPerShareBasic_9ff2ffbc-6424-452e-81f6-9d11d6e72c2a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_ff4a8be7-28af-469b-8f1c-e0191dac53c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_EarningsPerShareDiluted_ff4a8be7-28af-469b-8f1c-e0191dac53c4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3cff74e7-0358-453e-884d-0db083742d17" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3cff74e7-0358-453e-884d-0db083742d17" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_e996ce00-9e9a-46bd-91d1-3e5669e49fcc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3cff74e7-0358-453e-884d-0db083742d17" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_e996ce00-9e9a-46bd-91d1-3e5669e49fcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_be1ba42e-9547-44ad-aedb-5b2fc3a132dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_3cff74e7-0358-453e-884d-0db083742d17" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_be1ba42e-9547-44ad-aedb-5b2fc3a132dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_675f6052-3a26-4752-9cfb-89b2ad7de293" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_fc11c500-bd35-4e03-a7b5-57378dec2e99" xlink:to="loc_us-gaap_StatementTable_675f6052-3a26-4752-9cfb-89b2ad7de293" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_f584cdda-4146-44d6-8227-799cc57af438" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_675f6052-3a26-4752-9cfb-89b2ad7de293" xlink:to="loc_srt_ProductOrServiceAxis_f584cdda-4146-44d6-8227-799cc57af438" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f584cdda-4146-44d6-8227-799cc57af438_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_f584cdda-4146-44d6-8227-799cc57af438" xlink:to="loc_srt_ProductsAndServicesDomain_f584cdda-4146-44d6-8227-799cc57af438_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_0b3eb154-4891-48b1-9727-01f084d979bd" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_f584cdda-4146-44d6-8227-799cc57af438" xlink:to="loc_srt_ProductsAndServicesDomain_0b3eb154-4891-48b1-9727-01f084d979bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankServicingMember_68c5f42c-3f7c-4393-95be-eac383ceed9e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BankServicingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0b3eb154-4891-48b1-9727-01f084d979bd" xlink:to="loc_us-gaap_BankServicingMember_68c5f42c-3f7c-4393-95be-eac383ceed9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardMember_fa9801cf-f48d-401a-b093-02079086abcb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0b3eb154-4891-48b1-9727-01f084d979bd" xlink:to="loc_us-gaap_CreditCardMember_fa9801cf-f48d-401a-b093-02079086abcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBankingMember_4667c8a7-8b5c-40c7-b46a-d80d72a1856e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0b3eb154-4891-48b1-9727-01f084d979bd" xlink:to="loc_us-gaap_MortgageBankingMember_4667c8a7-8b5c-40c7-b46a-d80d72a1856e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/ConsolidatedStatementsofChangesinShareholdersEquity" xlink:type="simple" xlink:href="cbnk-20210930.xsd#ConsolidatedStatementsofChangesinShareholdersEquity"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/ConsolidatedStatementsofChangesinShareholdersEquity" xlink:type="extended" id="i6504fd76d889455b8b5a58df768ffe45_ConsolidatedStatementsofChangesinShareholdersEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_4a8e19fe-d839-4f92-adc6-dd0d3c6f6fe1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4a8e19fe-d839-4f92-adc6-dd0d3c6f6fe1" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_0db562f3-5105-46d9-8a85-911550d35902" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_0db562f3-5105-46d9-8a85-911550d35902" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_6ad1be80-dfa5-4208-b302-1a02b7d60cf5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_StockholdersEquity_6ad1be80-dfa5-4208-b302-1a02b7d60cf5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_aaa4cc93-15b4-4441-8c6e-e2a323e4668b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_NetIncomeLoss_aaa4cc93-15b4-4441-8c6e-e2a323e4668b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_07cee898-45d2-4873-b186-5f1567f55b88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_07cee898-45d2-4873-b186-5f1567f55b88" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_d2d8b037-3e9b-4a31-8d9f-50e796e77bea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_d2d8b037-3e9b-4a31-8d9f-50e796e77bea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_286f491e-fbe7-4182-8b08-eb6fb60e165b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_286f491e-fbe7-4182-8b08-eb6fb60e165b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_9b5e9dd2-0bc6-4df1-825e-9b1bc4bd6699" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_9b5e9dd2-0bc6-4df1-825e-9b1bc4bd6699" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_b238a0ca-1deb-4fe1-a098-1575b89d6278" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_b238a0ca-1deb-4fe1-a098-1575b89d6278" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e44b88f8-344c-484e-936c-2642b7f6a413" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e44b88f8-344c-484e-936c-2642b7f6a413" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_d421070d-1a34-4a22-a45a-e113981ce2dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_d421070d-1a34-4a22-a45a-e113981ce2dc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_f0854eb8-51ea-4ac9-83d3-8f082faf7ade" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2d1b88a4-ecca-4379-badd-248949880118" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_f0854eb8-51ea-4ac9-83d3-8f082faf7ade" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_bc57b018-17a6-48a8-81b9-e2c20da90830" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_55bc4fcc-823f-40e7-8576-431a9a762d24" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_61904abc-7d8a-40b8-9c5a-8dc43a6eb24d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4a8e19fe-d839-4f92-adc6-dd0d3c6f6fe1" xlink:to="loc_us-gaap_StatementTable_61904abc-7d8a-40b8-9c5a-8dc43a6eb24d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_b9937aea-9f1d-4c0d-bd22-dd9f23ff58dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_61904abc-7d8a-40b8-9c5a-8dc43a6eb24d" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_b9937aea-9f1d-4c0d-bd22-dd9f23ff58dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_b9937aea-9f1d-4c0d-bd22-dd9f23ff58dd_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_b9937aea-9f1d-4c0d-bd22-dd9f23ff58dd" xlink:to="loc_us-gaap_EquityComponentDomain_b9937aea-9f1d-4c0d-bd22-dd9f23ff58dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e4ab0d1e-f69c-40ab-9b6f-b6048e0bf255" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_b9937aea-9f1d-4c0d-bd22-dd9f23ff58dd" xlink:to="loc_us-gaap_EquityComponentDomain_e4ab0d1e-f69c-40ab-9b6f-b6048e0bf255" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_fbc0011a-195a-4357-9924-62a228921758" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4ab0d1e-f69c-40ab-9b6f-b6048e0bf255" xlink:to="loc_us-gaap_CommonStockMember_fbc0011a-195a-4357-9924-62a228921758" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_66e5b10c-c2f9-4b45-a324-202476e46dc9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4ab0d1e-f69c-40ab-9b6f-b6048e0bf255" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_66e5b10c-c2f9-4b45-a324-202476e46dc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_4b95300b-86f8-4b7f-9000-ab1fb03f4618" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4ab0d1e-f69c-40ab-9b6f-b6048e0bf255" xlink:to="loc_us-gaap_RetainedEarningsMember_4b95300b-86f8-4b7f-9000-ab1fb03f4618" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_b55db33c-99ea-428d-8f72-dedf0f6a7cc6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4ab0d1e-f69c-40ab-9b6f-b6048e0bf255" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_b55db33c-99ea-428d-8f72-dedf0f6a7cc6" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationBasisofpresentationDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#NatureofBusinessandBasisofPresentationBasisofpresentationDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationBasisofpresentationDetails" xlink:type="extended" id="i700dd33c10a6461db9285d010ff5fc85_NatureofBusinessandBasisofPresentationBasisofpresentationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_29e7c0d4-3925-4bd2-8187-6d2c6a1b36fc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_5821c962-501f-437d-96bb-cd7cecdc32ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_29e7c0d4-3925-4bd2-8187-6d2c6a1b36fc" xlink:to="loc_us-gaap_NotesReceivableNet_5821c962-501f-437d-96bb-cd7cecdc32ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_ccf8364e-9e73-4626-9eab-4eb611236dbe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_29e7c0d4-3925-4bd2-8187-6d2c6a1b36fc" xlink:to="loc_us-gaap_NumberOfReportableSegments_ccf8364e-9e73-4626-9eab-4eb611236dbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_3898044d-683a-442d-86a2-304196561cf5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_29e7c0d4-3925-4bd2-8187-6d2c6a1b36fc" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_3898044d-683a-442d-86a2-304196561cf5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_761e4f29-9036-4e39-86f4-ce19e693f8f0" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_3898044d-683a-442d-86a2-304196561cf5" xlink:to="loc_dei_LegalEntityAxis_761e4f29-9036-4e39-86f4-ce19e693f8f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_761e4f29-9036-4e39-86f4-ce19e693f8f0_default" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_761e4f29-9036-4e39-86f4-ce19e693f8f0" xlink:to="loc_dei_EntityDomain_761e4f29-9036-4e39-86f4-ce19e693f8f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_51b37dd1-31bb-4863-b707-82b1d2f09bca" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_761e4f29-9036-4e39-86f4-ce19e693f8f0" xlink:to="loc_dei_EntityDomain_51b37dd1-31bb-4863-b707-82b1d2f09bca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ChurchStreetCapitalMember_c5e8530e-71b3-493d-9126-c0498999617e" xlink:href="cbnk-20210930.xsd#cbnk_ChurchStreetCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_51b37dd1-31bb-4863-b707-82b1d2f09bca" xlink:to="loc_cbnk_ChurchStreetCapitalMember_c5e8530e-71b3-493d-9126-c0498999617e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationSBAPaycheckProtectionProgramDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#NatureofBusinessandBasisofPresentationSBAPaycheckProtectionProgramDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationSBAPaycheckProtectionProgramDetails" xlink:type="extended" id="ic9a16629881047a9ad44958216135405_NatureofBusinessandBasisofPresentationSBAPaycheckProtectionProgramDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_d8792424-00ae-4922-91eb-8f4b44b5e68d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_8139a05c-8186-4096-bd5b-dca3328ca4dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_d8792424-00ae-4922-91eb-8f4b44b5e68d" xlink:to="loc_us-gaap_NotesReceivableGross_8139a05c-8186-4096-bd5b-dca3328ca4dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_5c76bb6f-f486-472b-9e3d-ad2afa690d2d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_d8792424-00ae-4922-91eb-8f4b44b5e68d" xlink:to="loc_us-gaap_ContractWithCustomerLiability_5c76bb6f-f486-472b-9e3d-ad2afa690d2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOperating_57e2929b-fded-4878-beca-3003030f74b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_d8792424-00ae-4922-91eb-8f4b44b5e68d" xlink:to="loc_us-gaap_InterestIncomeOperating_57e2929b-fded-4878-beca-3003030f74b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_1aef85ea-d4cb-4991-8dc8-3e0f9a677b55" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_d8792424-00ae-4922-91eb-8f4b44b5e68d" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_1aef85ea-d4cb-4991-8dc8-3e0f9a677b55" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_18d1fab7-7047-472a-9d41-94da02facd7b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_1aef85ea-d4cb-4991-8dc8-3e0f9a677b55" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_18d1fab7-7047-472a-9d41-94da02facd7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_18d1fab7-7047-472a-9d41-94da02facd7b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_18d1fab7-7047-472a-9d41-94da02facd7b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_18d1fab7-7047-472a-9d41-94da02facd7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_fe2158d5-9047-4845-9e9e-ea8133ef5a0e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_18d1fab7-7047-472a-9d41-94da02facd7b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_fe2158d5-9047-4845-9e9e-ea8133ef5a0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_592ffb33-1694-4348-8a0b-503602ddd773" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_fe2158d5-9047-4845-9e9e-ea8133ef5a0e" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_592ffb33-1694-4348-8a0b-503602ddd773" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_d305dd43-25d0-4f3f-b031-32005177eb55" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_1aef85ea-d4cb-4991-8dc8-3e0f9a677b55" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_d305dd43-25d0-4f3f-b031-32005177eb55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_d305dd43-25d0-4f3f-b031-32005177eb55_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_d305dd43-25d0-4f3f-b031-32005177eb55" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_d305dd43-25d0-4f3f-b031-32005177eb55_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_39f1825d-a36e-4966-80f3-9b42bea92c1a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_d305dd43-25d0-4f3f-b031-32005177eb55" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_39f1825d-a36e-4966-80f3-9b42bea92c1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_PaycheckProtectionProgramMember_9bca6c9d-3346-46e4-8e18-dd5ddb476490" xlink:href="cbnk-20210930.xsd#cbnk_PaycheckProtectionProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_39f1825d-a36e-4966-80f3-9b42bea92c1a" xlink:to="loc_cbnk_PaycheckProtectionProgramMember_9bca6c9d-3346-46e4-8e18-dd5ddb476490" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationPremisesandequipmentDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#NatureofBusinessandBasisofPresentationPremisesandequipmentDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationPremisesandequipmentDetails" xlink:type="extended" id="ieda4239cb812465e9007cd25f09cf8cf_NatureofBusinessandBasisofPresentationPremisesandequipmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7e35b0da-0dcc-47b5-9cc3-68d9f2abef53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_c0e17e9a-fb7d-4812-b23c-a6cd08591cdf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7e35b0da-0dcc-47b5-9cc3-68d9f2abef53" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_c0e17e9a-fb7d-4812-b23c-a6cd08591cdf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1f3d054f-d876-45ae-9c40-b016e3084eb6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7e35b0da-0dcc-47b5-9cc3-68d9f2abef53" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1f3d054f-d876-45ae-9c40-b016e3084eb6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_573318f5-4c33-450f-af0d-4fd8e35b7c11" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1f3d054f-d876-45ae-9c40-b016e3084eb6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_573318f5-4c33-450f-af0d-4fd8e35b7c11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_573318f5-4c33-450f-af0d-4fd8e35b7c11_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_573318f5-4c33-450f-af0d-4fd8e35b7c11" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_573318f5-4c33-450f-af0d-4fd8e35b7c11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5b89087b-60ae-4837-bc84-5cff5a28afa3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_573318f5-4c33-450f-af0d-4fd8e35b7c11" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5b89087b-60ae-4837-bc84-5cff5a28afa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_PremisesAndEquipmentMember_a9829f9d-eb4e-42aa-8757-cf6d13ed7088" xlink:href="cbnk-20210930.xsd#cbnk_PremisesAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5b89087b-60ae-4837-bc84-5cff5a28afa3" xlink:to="loc_cbnk_PremisesAndEquipmentMember_a9829f9d-eb4e-42aa-8757-cf6d13ed7088" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_4408aca7-bd43-4d7b-a4e9-e2949a5ae5e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5b89087b-60ae-4837-bc84-5cff5a28afa3" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_4408aca7-bd43-4d7b-a4e9-e2949a5ae5e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9bfaf7ab-882d-461f-b856-bb44cff76283" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1f3d054f-d876-45ae-9c40-b016e3084eb6" xlink:to="loc_srt_RangeAxis_9bfaf7ab-882d-461f-b856-bb44cff76283" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9bfaf7ab-882d-461f-b856-bb44cff76283_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9bfaf7ab-882d-461f-b856-bb44cff76283" xlink:to="loc_srt_RangeMember_9bfaf7ab-882d-461f-b856-bb44cff76283_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3106ff72-e12a-4c20-90f2-0eafa0fe85af" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9bfaf7ab-882d-461f-b856-bb44cff76283" xlink:to="loc_srt_RangeMember_3106ff72-e12a-4c20-90f2-0eafa0fe85af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_cf7f97f5-5829-4136-85ef-cb147365310d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3106ff72-e12a-4c20-90f2-0eafa0fe85af" xlink:to="loc_srt_MinimumMember_cf7f97f5-5829-4136-85ef-cb147365310d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_094d423a-fb1f-4cc8-9970-6d89a677be2d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3106ff72-e12a-4c20-90f2-0eafa0fe85af" xlink:to="loc_srt_MaximumMember_094d423a-fb1f-4cc8-9970-6d89a677be2d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationEarningsperShareDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#NatureofBusinessandBasisofPresentationEarningsperShareDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationEarningsperShareDetails" xlink:type="extended" id="id06c57a853e34ffdaffb61dcf024d746_NatureofBusinessandBasisofPresentationEarningsperShareDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_21e0e1df-7e8f-408b-8a52-19b19d924022" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_17aa62b1-9bc9-4cd4-b17b-8fa56328d343" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_21e0e1df-7e8f-408b-8a52-19b19d924022" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_17aa62b1-9bc9-4cd4-b17b-8fa56328d343" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_34a35514-d1f4-4073-a0f7-b3ea26250635" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_21e0e1df-7e8f-408b-8a52-19b19d924022" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_34a35514-d1f4-4073-a0f7-b3ea26250635" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5879ac93-3af5-4de5-a0c2-c7cb38b45b63" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_34a35514-d1f4-4073-a0f7-b3ea26250635" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5879ac93-3af5-4de5-a0c2-c7cb38b45b63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_5879ac93-3af5-4de5-a0c2-c7cb38b45b63_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5879ac93-3af5-4de5-a0c2-c7cb38b45b63" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_5879ac93-3af5-4de5-a0c2-c7cb38b45b63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1e4b70e9-1fb3-4139-8b96-5591690de019" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5879ac93-3af5-4de5-a0c2-c7cb38b45b63" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1e4b70e9-1fb3-4139-8b96-5591690de019" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_37f4e5ee-e6b9-40f4-9d8a-f29c20b16cbc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1e4b70e9-1fb3-4139-8b96-5591690de019" xlink:to="loc_us-gaap_EmployeeStockOptionMember_37f4e5ee-e6b9-40f4-9d8a-f29c20b16cbc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationComprehensiveIncomeDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#NatureofBusinessandBasisofPresentationComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/NatureofBusinessandBasisofPresentationComprehensiveIncomeDetails" xlink:type="extended" id="i121deee5abe84450912f5853c708c9c9_NatureofBusinessandBasisofPresentationComprehensiveIncomeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d7d99578-52b3-4b33-b3a4-a3a2427c0e06" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociBeforeTaxAttributableToParent_ae05b29a-dd71-4e8b-8418-493836bfb0e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AociBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d7d99578-52b3-4b33-b3a4-a3a2427c0e06" xlink:to="loc_us-gaap_AociBeforeTaxAttributableToParent_ae05b29a-dd71-4e8b-8418-493836bfb0e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociTaxAttributableToParent_7ecb1d4d-016d-471c-92d3-034823ecf132" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AociTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d7d99578-52b3-4b33-b3a4-a3a2427c0e06" xlink:to="loc_us-gaap_AociTaxAttributableToParent_7ecb1d4d-016d-471c-92d3-034823ecf132" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_34e9a8dd-b5d3-4de5-82a6-8fea58ceeaa2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d7d99578-52b3-4b33-b3a4-a3a2427c0e06" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_34e9a8dd-b5d3-4de5-82a6-8fea58ceeaa2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_087d64ae-7774-440c-b805-eb99bb915801" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d7d99578-52b3-4b33-b3a4-a3a2427c0e06" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_087d64ae-7774-440c-b805-eb99bb915801" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_36cd9d7c-5072-4be8-9893-c43cdccdab59" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_087d64ae-7774-440c-b805-eb99bb915801" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_36cd9d7c-5072-4be8-9893-c43cdccdab59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_36cd9d7c-5072-4be8-9893-c43cdccdab59_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_36cd9d7c-5072-4be8-9893-c43cdccdab59" xlink:to="loc_us-gaap_EquityComponentDomain_36cd9d7c-5072-4be8-9893-c43cdccdab59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5d3a703c-08b9-454a-9087-9e691ed71e2d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_36cd9d7c-5072-4be8-9893-c43cdccdab59" xlink:to="loc_us-gaap_EquityComponentDomain_5d3a703c-08b9-454a-9087-9e691ed71e2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_86dfd7f1-c06b-4303-9190-2a3106361f49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5d3a703c-08b9-454a-9087-9e691ed71e2d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_86dfd7f1-c06b-4303-9190-2a3106361f49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_8f4843c0-7728-4153-a39e-54ce9e92e17a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_86dfd7f1-c06b-4303-9190-2a3106361f49" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_8f4843c0-7728-4153-a39e-54ce9e92e17a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/InvestmentSecuritiesAmortizedcosttoEstimatedFairValueDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#InvestmentSecuritiesAmortizedcosttoEstimatedFairValueDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/InvestmentSecuritiesAmortizedcosttoEstimatedFairValueDetails" xlink:type="extended" id="i8757646ef36149bc84fc468089be1d4c_InvestmentSecuritiesAmortizedcosttoEstimatedFairValueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_21c9650a-4c3e-4327-b2a7-f64e8dc2a540" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_21c9650a-4c3e-4327-b2a7-f64e8dc2a540" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_5402b998-b4ac-4686-a1a1-08ec7200d6a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_5402b998-b4ac-4686-a1a1-08ec7200d6a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_6925d733-567f-4cc4-88b5-118ae2840753" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_6925d733-567f-4cc4-88b5-118ae2840753" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_9fb43582-0265-4371-9f89-5ae4d2d67282" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_9fb43582-0265-4371-9f89-5ae4d2d67282" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold_5c08cbac-8022-413b-a06f-c7352ef8cf9b" xlink:href="cbnk-20210930.xsd#cbnk_DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_cbnk_DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold_5c08cbac-8022-413b-a06f-c7352ef8cf9b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_3e7802aa-134b-4ee3-ac5f-cf1bc52c1065" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_3e7802aa-134b-4ee3-ac5f-cf1bc52c1065" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_dabfd8ab-da5f-49c8-a4e5-52df9bd03163" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_dabfd8ab-da5f-49c8-a4e5-52df9bd03163" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_ff2b096a-de16-4588-80f8-80bf51a4a299" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_ff2b096a-de16-4588-80f8-80bf51a4a299" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_27d58458-655b-4eb5-9b96-3b0d4f73f213" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_52811fa7-8551-460d-87f6-010444a8d3df" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_27d58458-655b-4eb5-9b96-3b0d4f73f213" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_83fb4be6-8193-4e99-926f-f6eff9e02229" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_27d58458-655b-4eb5-9b96-3b0d4f73f213" xlink:to="loc_us-gaap_FinancialInstrumentAxis_83fb4be6-8193-4e99-926f-f6eff9e02229" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_83fb4be6-8193-4e99-926f-f6eff9e02229_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_83fb4be6-8193-4e99-926f-f6eff9e02229" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_83fb4be6-8193-4e99-926f-f6eff9e02229_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e33b2663-0f63-4c9e-a9bc-53dfacf23844" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_83fb4be6-8193-4e99-926f-f6eff9e02229" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e33b2663-0f63-4c9e-a9bc-53dfacf23844" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_b007e611-a511-435f-9c53-867768857530" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e33b2663-0f63-4c9e-a9bc-53dfacf23844" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_b007e611-a511-435f-9c53-867768857530" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_edf6bcff-e4e9-4045-8592-4389923122a8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e33b2663-0f63-4c9e-a9bc-53dfacf23844" xlink:to="loc_us-gaap_MunicipalBondsMember_edf6bcff-e4e9-4045-8592-4389923122a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_266649b5-0389-4b87-accb-c2a90efe4115" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e33b2663-0f63-4c9e-a9bc-53dfacf23844" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_266649b5-0389-4b87-accb-c2a90efe4115" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_9ad43e93-6656-42a2-9852-ee9468ab0ee5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e33b2663-0f63-4c9e-a9bc-53dfacf23844" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_9ad43e93-6656-42a2-9852-ee9468ab0ee5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_555ff01a-3589-474f-b8af-43723c61154b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e33b2663-0f63-4c9e-a9bc-53dfacf23844" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_555ff01a-3589-474f-b8af-43723c61154b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/InvestmentSecuritiesUnrealizedLossesDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#InvestmentSecuritiesUnrealizedLossesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/InvestmentSecuritiesUnrealizedLossesDetails" xlink:type="extended" id="i9cf8ec76313e4546b1c139f5b04e4d8f_InvestmentSecuritiesUnrealizedLossesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8098029a-4acc-42ed-9cb1-8c6cca861013" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAbstract_be099b30-d249-4964-9b1c-9536b3b07b90" xlink:href="cbnk-20210930.xsd#cbnk_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8098029a-4acc-42ed-9cb1-8c6cca861013" xlink:to="loc_cbnk_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAbstract_be099b30-d249-4964-9b1c-9536b3b07b90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_7a0919a3-7bfc-42b1-b0d6-ed346f7987b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAbstract_be099b30-d249-4964-9b1c-9536b3b07b90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_7a0919a3-7bfc-42b1-b0d6-ed346f7987b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_dcb65ff2-0885-4187-a071-64571377543d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAbstract_be099b30-d249-4964-9b1c-9536b3b07b90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_dcb65ff2-0885-4187-a071-64571377543d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_34d45b7c-b705-4276-80a3-8f00d684c5ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_DebtSecuritiesAvailableforsaleUnrealizedLossPositionAbstract_be099b30-d249-4964-9b1c-9536b3b07b90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_34d45b7c-b705-4276-80a3-8f00d684c5ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_4d37146e-4ea5-46a0-9714-eb495492b115" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8098029a-4acc-42ed-9cb1-8c6cca861013" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_4d37146e-4ea5-46a0-9714-eb495492b115" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_bcc0f1e1-c7d0-4c09-8a10-1f9fec7a40d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_4d37146e-4ea5-46a0-9714-eb495492b115" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_bcc0f1e1-c7d0-4c09-8a10-1f9fec7a40d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_1130b878-f7b6-4193-a26f-347d08bb94dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_4d37146e-4ea5-46a0-9714-eb495492b115" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_1130b878-f7b6-4193-a26f-347d08bb94dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_2b696f19-d4cb-4cbe-9c78-0f3e892b8788" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_4d37146e-4ea5-46a0-9714-eb495492b115" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_2b696f19-d4cb-4cbe-9c78-0f3e892b8788" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_9f39db8d-e15b-4c7c-8716-11303102cf7f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8098029a-4acc-42ed-9cb1-8c6cca861013" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_9f39db8d-e15b-4c7c-8716-11303102cf7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_631a711b-8772-4a79-ac70-29563ed157a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_8098029a-4acc-42ed-9cb1-8c6cca861013" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_631a711b-8772-4a79-ac70-29563ed157a9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_0b5427ff-482e-4fd0-a0b2-401678e0cd46" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_631a711b-8772-4a79-ac70-29563ed157a9" xlink:to="loc_us-gaap_FinancialInstrumentAxis_0b5427ff-482e-4fd0-a0b2-401678e0cd46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_0b5427ff-482e-4fd0-a0b2-401678e0cd46_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_0b5427ff-482e-4fd0-a0b2-401678e0cd46" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_0b5427ff-482e-4fd0-a0b2-401678e0cd46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ea74b66f-a6f5-47c8-b024-937775ca614b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_0b5427ff-482e-4fd0-a0b2-401678e0cd46" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ea74b66f-a6f5-47c8-b024-937775ca614b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_41854745-4c62-4fe7-a839-b98ea8e4d3eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ea74b66f-a6f5-47c8-b024-937775ca614b" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_41854745-4c62-4fe7-a839-b98ea8e4d3eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_e4b6217d-1f1b-4988-ba0e-b3b0c7e8788f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ea74b66f-a6f5-47c8-b024-937775ca614b" xlink:to="loc_us-gaap_MunicipalBondsMember_e4b6217d-1f1b-4988-ba0e-b3b0c7e8788f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_90203af5-4df8-43be-8719-3e1f36e1a88b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ea74b66f-a6f5-47c8-b024-937775ca614b" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_90203af5-4df8-43be-8719-3e1f36e1a88b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_2ab8188a-c160-4f70-b0fe-41100273b218" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ea74b66f-a6f5-47c8-b024-937775ca614b" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_2ab8188a-c160-4f70-b0fe-41100273b218" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_f6f73c3f-0a7b-4054-9d3e-e75ff5f2626d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ea74b66f-a6f5-47c8-b024-937775ca614b" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_f6f73c3f-0a7b-4054-9d3e-e75ff5f2626d" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/InvestmentSecuritiesPledgedSecuritiesDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#InvestmentSecuritiesPledgedSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/InvestmentSecuritiesPledgedSecuritiesDetails" xlink:type="extended" id="i6748aea5fcea43e08700d2856e924be0_InvestmentSecuritiesPledgedSecuritiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems_db44c409-ac3a-4dd7-8dcd-7a22b073eed9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue_28f68f46-5050-4aea-9dd5-6be121895667" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems_db44c409-ac3a-4dd7-8dcd-7a22b073eed9" xlink:to="loc_us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue_28f68f46-5050-4aea-9dd5-6be121895667" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable_253d41d6-c9f9-452e-8618-ddc7ab962129" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems_db44c409-ac3a-4dd7-8dcd-7a22b073eed9" xlink:to="loc_us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable_253d41d6-c9f9-452e-8618-ddc7ab962129" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_8ec211fa-8875-496b-bc22-99c799468572" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable_253d41d6-c9f9-452e-8618-ddc7ab962129" xlink:to="loc_us-gaap_FinancialInstrumentAxis_8ec211fa-8875-496b-bc22-99c799468572" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8ec211fa-8875-496b-bc22-99c799468572_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_8ec211fa-8875-496b-bc22-99c799468572" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8ec211fa-8875-496b-bc22-99c799468572_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_7ca70f46-744e-461b-abfe-7f78d2da64e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_8ec211fa-8875-496b-bc22-99c799468572" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_7ca70f46-744e-461b-abfe-7f78d2da64e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankAdvancesMember_fe21e461-8053-49ff-9ff8-c85ad32ffb97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FederalHomeLoanBankAdvancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_7ca70f46-744e-461b-abfe-7f78d2da64e8" xlink:to="loc_us-gaap_FederalHomeLoanBankAdvancesMember_fe21e461-8053-49ff-9ff8-c85ad32ffb97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_6fef072a-2ac4-4bd2-a7ae-cbec99cc1838" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable_253d41d6-c9f9-452e-8618-ddc7ab962129" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_6fef072a-2ac4-4bd2-a7ae-cbec99cc1838" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_6fef072a-2ac4-4bd2-a7ae-cbec99cc1838_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_6fef072a-2ac4-4bd2-a7ae-cbec99cc1838" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_6fef072a-2ac4-4bd2-a7ae-cbec99cc1838_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_90facc1a-e7c0-499d-8db4-0b6b2cb12102" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_6fef072a-2ac4-4bd2-a7ae-cbec99cc1838" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_90facc1a-e7c0-499d-8db4-0b6b2cb12102" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_a6a65eae-a1d1-4225-8091-c645ffba3048" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_90facc1a-e7c0-499d-8db4-0b6b2cb12102" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_a6a65eae-a1d1-4225-8091-c645ffba3048" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_3cc2e138-522f-45ed-82f5-49bc69e5a760" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_90facc1a-e7c0-499d-8db4-0b6b2cb12102" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_3cc2e138-522f-45ed-82f5-49bc69e5a760" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_e594cc25-7d3c-4124-91f1-2e8d0401c439" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_90facc1a-e7c0-499d-8db4-0b6b2cb12102" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_e594cc25-7d3c-4124-91f1-2e8d0401c439" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/InvestmentSecuritiesbyMaturityDatesDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#InvestmentSecuritiesbyMaturityDatesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/InvestmentSecuritiesbyMaturityDatesDetails" xlink:type="extended" id="i2cc125febd904f41b113cbcf229473a5_InvestmentSecuritiesbyMaturityDatesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_311c19fe-9d8e-49db-99ef-4ecc74fea653" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_15a8771c-f91d-487f-9842-68e8553f16bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_311c19fe-9d8e-49db-99ef-4ecc74fea653" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_15a8771c-f91d-487f-9842-68e8553f16bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_dda5d47c-bafe-4abe-955e-882ebff52bd1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_15a8771c-f91d-487f-9842-68e8553f16bb" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_dda5d47c-bafe-4abe-955e-882ebff52bd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_72fea1c2-3c32-4f8e-a18a-6188cddc598e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_15a8771c-f91d-487f-9842-68e8553f16bb" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_72fea1c2-3c32-4f8e-a18a-6188cddc598e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_ff5defa5-943b-49ce-918f-70e1dbe366e7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_15a8771c-f91d-487f-9842-68e8553f16bb" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_ff5defa5-943b-49ce-918f-70e1dbe366e7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_947fb103-4e68-4e05-ba9c-24e55d6d4c4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_15a8771c-f91d-487f-9842-68e8553f16bb" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_947fb103-4e68-4e05-ba9c-24e55d6d4c4d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_d59ea040-2a37-4ce5-8315-8c97b7c6381d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_15a8771c-f91d-487f-9842-68e8553f16bb" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_d59ea040-2a37-4ce5-8315-8c97b7c6381d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_8b71ac0f-3232-40ce-98e0-e3b154fed969" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_311c19fe-9d8e-49db-99ef-4ecc74fea653" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_8b71ac0f-3232-40ce-98e0-e3b154fed969" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_6dcc4c7a-1a99-4870-a6a3-e23fd02d93e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_8b71ac0f-3232-40ce-98e0-e3b154fed969" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_6dcc4c7a-1a99-4870-a6a3-e23fd02d93e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_03ed4d19-7320-42fd-a5bb-19756f5e1b97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_8b71ac0f-3232-40ce-98e0-e3b154fed969" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_03ed4d19-7320-42fd-a5bb-19756f5e1b97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_93544a0b-be2e-4117-b85c-af1c2bf7e3da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_8b71ac0f-3232-40ce-98e0-e3b154fed969" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_93544a0b-be2e-4117-b85c-af1c2bf7e3da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_8340889d-fe55-41c8-88ac-f3e3a5c37ac8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_8b71ac0f-3232-40ce-98e0-e3b154fed969" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_8340889d-fe55-41c8-88ac-f3e3a5c37ac8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ccb58281-0d3e-48fc-a289-6ffc8d66618c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_8b71ac0f-3232-40ce-98e0-e3b154fed969" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ccb58281-0d3e-48fc-a289-6ffc8d66618c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6ae54c97-4129-46e0-90c4-5d31268d6f3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_311c19fe-9d8e-49db-99ef-4ecc74fea653" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6ae54c97-4129-46e0-90c4-5d31268d6f3d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_4f76123a-725c-432b-9025-700b3da97266" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6ae54c97-4129-46e0-90c4-5d31268d6f3d" xlink:to="loc_us-gaap_FinancialInstrumentAxis_4f76123a-725c-432b-9025-700b3da97266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4f76123a-725c-432b-9025-700b3da97266_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_4f76123a-725c-432b-9025-700b3da97266" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4f76123a-725c-432b-9025-700b3da97266_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f22060e0-4f28-4290-93c6-4101bac908e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_4f76123a-725c-432b-9025-700b3da97266" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f22060e0-4f28-4290-93c6-4101bac908e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_b1fa519b-f772-4056-9cff-eb270bdf1848" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f22060e0-4f28-4290-93c6-4101bac908e3" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_b1fa519b-f772-4056-9cff-eb270bdf1848" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/SBAPPPLoansReceivable" xlink:type="simple" xlink:href="cbnk-20210930.xsd#SBAPPPLoansReceivable"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/SBAPPPLoansReceivable" xlink:type="extended" id="i42e43251b8c74adea763e4814d0e1711_SBAPPPLoansReceivable">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_638be718-d1bc-4018-986e-812853be3917" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesTextBlock_afe7affa-6c1c-4a9c-b7c7-3af0daa9e73e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_638be718-d1bc-4018-986e-812853be3917" xlink:to="loc_us-gaap_FinancingReceivablesTextBlock_afe7affa-6c1c-4a9c-b7c7-3af0daa9e73e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_fdced1b2-b58d-44d8-8214-45d94108e407" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_638be718-d1bc-4018-986e-812853be3917" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_fdced1b2-b58d-44d8-8214-45d94108e407" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_256e5843-697e-479b-a229-674a03507f31" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_fdced1b2-b58d-44d8-8214-45d94108e407" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_256e5843-697e-479b-a229-674a03507f31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_256e5843-697e-479b-a229-674a03507f31_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_256e5843-697e-479b-a229-674a03507f31" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_256e5843-697e-479b-a229-674a03507f31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_0ec6b888-6460-49f6-9a73-a7b5ee65406d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_256e5843-697e-479b-a229-674a03507f31" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_0ec6b888-6460-49f6-9a73-a7b5ee65406d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_PaycheckProtectionProgramMember_333e40f8-6b07-4801-a3ee-c256bc0ba39c" xlink:href="cbnk-20210930.xsd#cbnk_PaycheckProtectionProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_0ec6b888-6460-49f6-9a73-a7b5ee65406d" xlink:to="loc_cbnk_PaycheckProtectionProgramMember_333e40f8-6b07-4801-a3ee-c256bc0ba39c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/SBAPPPLoansReceivableDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#SBAPPPLoansReceivableDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/SBAPPPLoansReceivableDetails" xlink:type="extended" id="ibe61d64128364994982eae0f5da1c195_SBAPPPLoansReceivableDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_ef6a85bf-6ef3-4900-b701-b1aec1ff0dc0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_c683cda5-e715-4d0c-a09c-ce932c64bcb5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_ef6a85bf-6ef3-4900-b701-b1aec1ff0dc0" xlink:to="loc_us-gaap_NotesReceivableGross_c683cda5-e715-4d0c-a09c-ce932c64bcb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_008c3b6e-acad-4071-93d8-04229d6ba3f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_ef6a85bf-6ef3-4900-b701-b1aec1ff0dc0" xlink:to="loc_us-gaap_ContractWithCustomerLiability_008c3b6e-acad-4071-93d8-04229d6ba3f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_46528276-d790-4e52-a566-0867ad29dd3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_ef6a85bf-6ef3-4900-b701-b1aec1ff0dc0" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_46528276-d790-4e52-a566-0867ad29dd3f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_e2e7d472-b7c9-46c0-8edc-4a2fc002dcce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_46528276-d790-4e52-a566-0867ad29dd3f" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_e2e7d472-b7c9-46c0-8edc-4a2fc002dcce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_e2e7d472-b7c9-46c0-8edc-4a2fc002dcce_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_e2e7d472-b7c9-46c0-8edc-4a2fc002dcce" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_e2e7d472-b7c9-46c0-8edc-4a2fc002dcce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_fa1f626b-415f-4658-995b-7c04fba5cdb0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_e2e7d472-b7c9-46c0-8edc-4a2fc002dcce" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_fa1f626b-415f-4658-995b-7c04fba5cdb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_2044ea22-a85a-4c7e-ba73-6224b4f45001" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_fa1f626b-415f-4658-995b-7c04fba5cdb0" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_2044ea22-a85a-4c7e-ba73-6224b4f45001" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_a5ded0dc-206d-465c-8ed4-f367970eb9e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_46528276-d790-4e52-a566-0867ad29dd3f" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_a5ded0dc-206d-465c-8ed4-f367970eb9e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a5ded0dc-206d-465c-8ed4-f367970eb9e8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_a5ded0dc-206d-465c-8ed4-f367970eb9e8" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a5ded0dc-206d-465c-8ed4-f367970eb9e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a211f44b-94ea-424f-a069-a80c70cef24f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_a5ded0dc-206d-465c-8ed4-f367970eb9e8" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a211f44b-94ea-424f-a069-a80c70cef24f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_PaycheckProtectionProgramMember_0fd9535d-4d33-44f3-a2c9-783269523848" xlink:href="cbnk-20210930.xsd#cbnk_PaycheckProtectionProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a211f44b-94ea-424f-a069-a80c70cef24f" xlink:to="loc_cbnk_PaycheckProtectionProgramMember_0fd9535d-4d33-44f3-a2c9-783269523848" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableClassificationofLoansDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#PortfolioLoansReceivableClassificationofLoansDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableClassificationofLoansDetails" xlink:type="extended" id="i6113ade649024a3f8b0c69e4426bd7ff_PortfolioLoansReceivableClassificationofLoansDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_187d9f0a-b095-40ea-af7c-4eed715e8075" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_us-gaap_NotesReceivableGross_187d9f0a-b095-40ea-af7c-4eed715e8075" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount_3ccc42a2-3176-4a36-9778-e95a913af065" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_us-gaap_FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount_3ccc42a2-3176-4a36-9778-e95a913af065" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_b5aa726d-e14f-42a0-ab49-cf68ccb81470" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_b5aa726d-e14f-42a0-ab49-cf68ccb81470" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_1da1684a-acfe-4561-8584-68f99cff8baa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_us-gaap_NotesReceivableNet_1da1684a-acfe-4561-8584-68f99cff8baa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableFixedInterestRateTerm_00667afb-ced8-4aac-8db4-8bfee55235cf" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableFixedInterestRateTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_FinancingReceivableFixedInterestRateTerm_00667afb-ced8-4aac-8db4-8bfee55235cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableInitialCommitmentTerm_86780670-ecee-4fea-9006-4da0e23c250a" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableInitialCommitmentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_FinancingReceivableInitialCommitmentTerm_86780670-ecee-4fea-9006-4da0e23c250a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableBalloonPaymentPeriod_2d733c50-c724-403a-bcb2-aaaf68d0a405" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableBalloonPaymentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_FinancingReceivableBalloonPaymentPeriod_2d733c50-c724-403a-bcb2-aaaf68d0a405" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoansAndLeasesReceivableCovenantComplianceDebtServiceCoverageRatio_f2ccf94f-5489-4c4d-a7d3-22947a84dcf7" xlink:href="cbnk-20210930.xsd#cbnk_LoansAndLeasesReceivableCovenantComplianceDebtServiceCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_LoansAndLeasesReceivableCovenantComplianceDebtServiceCoverageRatio_f2ccf94f-5489-4c4d-a7d3-22947a84dcf7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivablePercentOfRealEstatePortfolio_b42dad1d-4f26-4eca-a9ce-b21d381d44fa" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivablePercentOfRealEstatePortfolio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_FinancingReceivablePercentOfRealEstatePortfolio_b42dad1d-4f26-4eca-a9ce-b21d381d44fa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableAmortizationPeriod_7a19f6f9-db96-4912-9ae6-3355426d9ff0" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableAmortizationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_FinancingReceivableAmortizationPeriod_7a19f6f9-db96-4912-9ae6-3355426d9ff0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivablePrincipalToCollateralValueRatioPercent_8c4c5138-fe0c-400a-99a0-087eff0df12c" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivablePrincipalToCollateralValueRatioPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_FinancingReceivablePrincipalToCollateralValueRatioPercent_8c4c5138-fe0c-400a-99a0-087eff0df12c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableRepaymentHistoryUsedForScoringModel_30d6ddf9-6750-46f2-9eec-e2b00788730c" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableRepaymentHistoryUsedForScoringModel"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_FinancingReceivableRepaymentHistoryUsedForScoringModel_30d6ddf9-6750-46f2-9eec-e2b00788730c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_40bf4222-2b0c-4a13-98a8-18c5ef936be3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_40bf4222-2b0c-4a13-98a8-18c5ef936be3" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableWithNonaccretableDiscountsNetAmount_1d49a738-a939-4b73-a68a-e543e91b60a5" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableWithNonaccretableDiscountsNetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_cbnk_FinancingReceivableWithNonaccretableDiscountsNetAmount_1d49a738-a939-4b73-a68a-e543e91b60a5" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_e65883e2-0679-425a-a401-91e647c41be1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_8e781931-b338-49b9-8524-fe6afa3cf74c" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_e65883e2-0679-425a-a401-91e647c41be1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis_baf75505-729c-46cd-acf1-19a4a7151857" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_e65883e2-0679-425a-a401-91e647c41be1" xlink:to="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis_baf75505-729c-46cd-acf1-19a4a7151857" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerDomain_baf75505-729c-46cd-acf1-19a4a7151857_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfFinancingReceivableTypeOfBorrowerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis_baf75505-729c-46cd-acf1-19a4a7151857" xlink:to="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerDomain_baf75505-729c-46cd-acf1-19a4a7151857_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerDomain_5bf92db9-f3bb-4750-95b0-be355e69476f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfFinancingReceivableTypeOfBorrowerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis_baf75505-729c-46cd-acf1-19a4a7151857" xlink:to="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerDomain_5bf92db9-f3bb-4750-95b0-be355e69476f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OwnerOccupiedRealEstateMember_84f43437-f1f1-4797-9706-df2d237d1d85" xlink:href="cbnk-20210930.xsd#cbnk_OwnerOccupiedRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerDomain_5bf92db9-f3bb-4750-95b0-be355e69476f" xlink:to="loc_cbnk_OwnerOccupiedRealEstateMember_84f43437-f1f1-4797-9706-df2d237d1d85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_InvestorRealEstateMember_b3b00835-84c5-485a-9e23-19ef546b52e0" xlink:href="cbnk-20210930.xsd#cbnk_InvestorRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfFinancingReceivableTypeOfBorrowerDomain_5bf92db9-f3bb-4750-95b0-be355e69476f" xlink:to="loc_cbnk_InvestorRealEstateMember_b3b00835-84c5-485a-9e23-19ef546b52e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a84d36c7-6f3d-45d5-bdce-ba983ca1cb4c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_e65883e2-0679-425a-a401-91e647c41be1" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a84d36c7-6f3d-45d5-bdce-ba983ca1cb4c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_a84d36c7-6f3d-45d5-bdce-ba983ca1cb4c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a84d36c7-6f3d-45d5-bdce-ba983ca1cb4c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_a84d36c7-6f3d-45d5-bdce-ba983ca1cb4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bf19f0b5-ccdc-417a-bfce-418704d1037c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a84d36c7-6f3d-45d5-bdce-ba983ca1cb4c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bf19f0b5-ccdc-417a-bfce-418704d1037c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_9d2e7eef-c68b-4a46-8968-0c67ce8a411b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bf19f0b5-ccdc-417a-bfce-418704d1037c" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_9d2e7eef-c68b-4a46-8968-0c67ce8a411b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_26cae9dd-070b-47f4-b00b-f5b4a9414ed9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bf19f0b5-ccdc-417a-bfce-418704d1037c" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_26cae9dd-070b-47f4-b00b-f5b4a9414ed9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_563603b7-68a0-4227-9d02-5330381d3d5a" xlink:href="cbnk-20210930.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bf19f0b5-ccdc-417a-bfce-418704d1037c" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_563603b7-68a0-4227-9d02-5330381d3d5a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_a92129ce-4d74-4a61-8ce4-393ebbb0f4d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bf19f0b5-ccdc-417a-bfce-418704d1037c" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_a92129ce-4d74-4a61-8ce4-393ebbb0f4d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_51225a85-578a-4c1c-abf1-f4a7fb2e9b06" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_e65883e2-0679-425a-a401-91e647c41be1" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_51225a85-578a-4c1c-abf1-f4a7fb2e9b06" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_51225a85-578a-4c1c-abf1-f4a7fb2e9b06_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_51225a85-578a-4c1c-abf1-f4a7fb2e9b06" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_51225a85-578a-4c1c-abf1-f4a7fb2e9b06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_b51d0db7-c2d1-4296-895b-d32cb46a36fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_51225a85-578a-4c1c-abf1-f4a7fb2e9b06" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_b51d0db7-c2d1-4296-895b-d32cb46a36fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_833362d8-02bf-4fe2-bf62-a3a2a4f8ba06" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_b51d0db7-c2d1-4296-895b-d32cb46a36fd" xlink:to="loc_us-gaap_RealEstateLoanMember_833362d8-02bf-4fe2-bf62-a3a2a4f8ba06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_d4affcee-43ad-4574-a308-f3598acc827c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_b51d0db7-c2d1-4296-895b-d32cb46a36fd" xlink:to="loc_us-gaap_CreditCardReceivablesMember_d4affcee-43ad-4574-a308-f3598acc827c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_e3a73841-5554-49d1-9db1-fddd5ad726db" xlink:href="cbnk-20210930.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_b51d0db7-c2d1-4296-895b-d32cb46a36fd" xlink:to="loc_cbnk_OtherConsumerMember_e3a73841-5554-49d1-9db1-fddd5ad726db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_89f4e6f1-ef14-4cfc-af9c-25f91df689ac" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_e65883e2-0679-425a-a401-91e647c41be1" xlink:to="loc_us-gaap_CollateralAxis_89f4e6f1-ef14-4cfc-af9c-25f91df689ac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_89f4e6f1-ef14-4cfc-af9c-25f91df689ac_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_89f4e6f1-ef14-4cfc-af9c-25f91df689ac" xlink:to="loc_us-gaap_CollateralDomain_89f4e6f1-ef14-4cfc-af9c-25f91df689ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_252637f9-f46d-4299-aeec-b4322d8d029f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_89f4e6f1-ef14-4cfc-af9c-25f91df689ac" xlink:to="loc_us-gaap_CollateralDomain_252637f9-f46d-4299-aeec-b4322d8d029f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_SavingsDepositsMember_71816f5f-ef21-4110-8abe-39988e0a2aed" xlink:href="cbnk-20210930.xsd#cbnk_SavingsDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_252637f9-f46d-4299-aeec-b4322d8d029f" xlink:to="loc_cbnk_SavingsDepositsMember_71816f5f-ef21-4110-8abe-39988e0a2aed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_03836d62-2f04-4083-a9a0-7b6ca5aa4127" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_e65883e2-0679-425a-a401-91e647c41be1" xlink:to="loc_srt_RangeAxis_03836d62-2f04-4083-a9a0-7b6ca5aa4127" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_03836d62-2f04-4083-a9a0-7b6ca5aa4127_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_03836d62-2f04-4083-a9a0-7b6ca5aa4127" xlink:to="loc_srt_RangeMember_03836d62-2f04-4083-a9a0-7b6ca5aa4127_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_58b45e11-1140-4583-9063-6671c835d63d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_03836d62-2f04-4083-a9a0-7b6ca5aa4127" xlink:to="loc_srt_RangeMember_58b45e11-1140-4583-9063-6671c835d63d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_5e92aa10-bfe1-4c06-bf45-526ddde9fea9" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_58b45e11-1140-4583-9063-6671c835d63d" xlink:to="loc_srt_MinimumMember_5e92aa10-bfe1-4c06-bf45-526ddde9fea9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_498d91bd-9322-4fd9-a128-156c2baaa6b0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_58b45e11-1140-4583-9063-6671c835d63d" xlink:to="loc_srt_MaximumMember_498d91bd-9322-4fd9-a128-156c2baaa6b0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableAllowanceforLoanLossesDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#PortfolioLoansReceivableAllowanceforLoanLossesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableAllowanceforLoanLossesDetails" xlink:type="extended" id="i73874a81e2a2456f88060731c8ab985d_PortfolioLoansReceivableAllowanceforLoanLossesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_29fadf21-c3f7-4347-b819-6fffcf8dc1ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForLoanAndLeaseLossesRollForward_ad277106-64c0-401d-9df8-2f8379ee843c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForLoanAndLeaseLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_29fadf21-c3f7-4347-b819-6fffcf8dc1ea" xlink:to="loc_us-gaap_AllowanceForLoanAndLeaseLossesRollForward_ad277106-64c0-401d-9df8-2f8379ee843c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_d8e6642a-b055-4424-a0a3-8ce097fcee99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForLoanAndLeaseLossesRollForward_ad277106-64c0-401d-9df8-2f8379ee843c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_d8e6642a-b055-4424-a0a3-8ce097fcee99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_7637b7d7-ddfe-41b9-83ae-dd52d6288f1b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForLoanAndLeaseLossesRollForward_ad277106-64c0-401d-9df8-2f8379ee843c" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_7637b7d7-ddfe-41b9-83ae-dd52d6288f1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_639abe33-abad-4e35-ae6e-aece48e405af" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForLoanAndLeaseLossesRollForward_ad277106-64c0-401d-9df8-2f8379ee843c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_639abe33-abad-4e35-ae6e-aece48e405af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_5237e1e6-1b81-432b-993f-b8203b91e63d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForLoanAndLeaseLossesRollForward_ad277106-64c0-401d-9df8-2f8379ee843c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_5237e1e6-1b81-432b-993f-b8203b91e63d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_e5f470cc-fc5f-4b72-ada6-6b5e2281cb02" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_87132f18-b1f5-49d7-916a-94b3ff6a92dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_29fadf21-c3f7-4347-b819-6fffcf8dc1ea" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_87132f18-b1f5-49d7-916a-94b3ff6a92dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_ad25e113-f66b-40f1-a14b-f2a9daa770e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_29fadf21-c3f7-4347-b819-6fffcf8dc1ea" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_ad25e113-f66b-40f1-a14b-f2a9daa770e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_109e4522-2763-4cee-ac03-9f3b2a84fc25" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_29fadf21-c3f7-4347-b819-6fffcf8dc1ea" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_109e4522-2763-4cee-ac03-9f3b2a84fc25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_b7c08bee-dfbe-41f7-a02e-c9651d4e1edd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_29fadf21-c3f7-4347-b819-6fffcf8dc1ea" xlink:to="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_b7c08bee-dfbe-41f7-a02e-c9651d4e1edd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_ac65a490-0ab8-4ce6-8a4b-f62dd4dfda49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_29fadf21-c3f7-4347-b819-6fffcf8dc1ea" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_ac65a490-0ab8-4ce6-8a4b-f62dd4dfda49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_7757c7c3-2bfc-4864-b17e-e50646bc3238" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_ac65a490-0ab8-4ce6-8a4b-f62dd4dfda49" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_7757c7c3-2bfc-4864-b17e-e50646bc3238" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_7757c7c3-2bfc-4864-b17e-e50646bc3238_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_7757c7c3-2bfc-4864-b17e-e50646bc3238" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_7757c7c3-2bfc-4864-b17e-e50646bc3238_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_93fbad14-1987-4de4-9b24-dc3f98b760a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_7757c7c3-2bfc-4864-b17e-e50646bc3238" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_93fbad14-1987-4de4-9b24-dc3f98b760a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_5c306a5b-e633-474b-a6af-16c71fc8265d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_93fbad14-1987-4de4-9b24-dc3f98b760a9" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_5c306a5b-e633-474b-a6af-16c71fc8265d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_29275847-6498-4eac-b573-ec3eb150be4f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_93fbad14-1987-4de4-9b24-dc3f98b760a9" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_29275847-6498-4eac-b573-ec3eb150be4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_d821c5b9-4bea-4b29-bb25-55d5507d9371" xlink:href="cbnk-20210930.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_93fbad14-1987-4de4-9b24-dc3f98b760a9" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_d821c5b9-4bea-4b29-bb25-55d5507d9371" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_ec4adfa4-a47a-442f-a203-9ac2d43236b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_93fbad14-1987-4de4-9b24-dc3f98b760a9" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_ec4adfa4-a47a-442f-a203-9ac2d43236b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_d323f8f3-626d-4510-a29a-5092b62f4f8c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_ac65a490-0ab8-4ce6-8a4b-f62dd4dfda49" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_d323f8f3-626d-4510-a29a-5092b62f4f8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_d323f8f3-626d-4510-a29a-5092b62f4f8c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_d323f8f3-626d-4510-a29a-5092b62f4f8c" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_d323f8f3-626d-4510-a29a-5092b62f4f8c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_06158b9d-493f-4362-b115-9786e31528ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_d323f8f3-626d-4510-a29a-5092b62f4f8c" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_06158b9d-493f-4362-b115-9786e31528ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_8852560e-8d9e-46ae-ad2e-7d82ae53cb59" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_06158b9d-493f-4362-b115-9786e31528ea" xlink:to="loc_us-gaap_RealEstateLoanMember_8852560e-8d9e-46ae-ad2e-7d82ae53cb59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_f600f689-db77-4f0d-864c-bceb1914e5ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_06158b9d-493f-4362-b115-9786e31528ea" xlink:to="loc_us-gaap_CreditCardReceivablesMember_f600f689-db77-4f0d-864c-bceb1914e5ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_abef078c-725c-4e2b-95c7-7ee2f5873ec0" xlink:href="cbnk-20210930.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_06158b9d-493f-4362-b115-9786e31528ea" xlink:to="loc_cbnk_OtherConsumerMember_abef078c-725c-4e2b-95c7-7ee2f5873ec0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivablePastDueFinancingReceivableDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#PortfolioLoansReceivablePastDueFinancingReceivableDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivablePastDueFinancingReceivableDetails" xlink:type="extended" id="i0cbc93e757324307b9bc82c987cc0a92_PortfolioLoansReceivablePastDueFinancingReceivableDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue_fa177e97-dcde-4aee-89c4-6b6eb18260ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue_fa177e97-dcde-4aee-89c4-6b6eb18260ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentCurrent_241100a9-2235-463c-8be1-37e2d86f4470" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentCurrent_241100a9-2235-463c-8be1-37e2d86f4470" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_7e720683-1034-42ae-880d-5f0dbfe5ece8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:to="loc_us-gaap_NotesReceivableGross_7e720683-1034-42ae-880d-5f0dbfe5ece8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_1ed05d0c-b0e0-4ae6-a2fb-74a0d5c7be1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_1ed05d0c-b0e0-4ae6-a2fb-74a0d5c7be1f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_abb9222d-602a-46e2-b5fc-29e35893d423" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_abb9222d-602a-46e2-b5fc-29e35893d423" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableNumberOfLoansInProcessOfForeclosure_42c10d91-d8ef-4206-ad76-f69b996cca97" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableNumberOfLoansInProcessOfForeclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:to="loc_cbnk_FinancingReceivableNumberOfLoansInProcessOfForeclosure_42c10d91-d8ef-4206-ad76-f69b996cca97" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansInProcessOfForeclosureAmount_fb28a77b-cb96-471e-865e-f33efc0de0f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageLoansInProcessOfForeclosureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:to="loc_us-gaap_MortgageLoansInProcessOfForeclosureAmount_fb28a77b-cb96-471e-865e-f33efc0de0f8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_2f045ee6-2399-4d47-9a4e-6c2502506d5a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_4b942915-1624-42d9-9e4f-9d3768d1bf4f" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_2f045ee6-2399-4d47-9a4e-6c2502506d5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_d9058a5d-7091-4ceb-b5c7-64d30b79592d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_2f045ee6-2399-4d47-9a4e-6c2502506d5a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_d9058a5d-7091-4ceb-b5c7-64d30b79592d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_d9058a5d-7091-4ceb-b5c7-64d30b79592d_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_d9058a5d-7091-4ceb-b5c7-64d30b79592d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_d9058a5d-7091-4ceb-b5c7-64d30b79592d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c61d8efc-d06e-4ba0-8774-2c8c74bc4990" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_d9058a5d-7091-4ceb-b5c7-64d30b79592d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c61d8efc-d06e-4ba0-8774-2c8c74bc4990" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_9f513a88-0a04-4117-b321-903d103caa18" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c61d8efc-d06e-4ba0-8774-2c8c74bc4990" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_9f513a88-0a04-4117-b321-903d103caa18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_fb11a732-9570-4896-bfd8-d7faef7dc791" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c61d8efc-d06e-4ba0-8774-2c8c74bc4990" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_fb11a732-9570-4896-bfd8-d7faef7dc791" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_a48cec67-3ec7-495b-9c38-266190222a13" xlink:href="cbnk-20210930.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c61d8efc-d06e-4ba0-8774-2c8c74bc4990" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_a48cec67-3ec7-495b-9c38-266190222a13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_12581a0e-1832-45b8-b7d3-068c5a11ef2f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c61d8efc-d06e-4ba0-8774-2c8c74bc4990" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_12581a0e-1832-45b8-b7d3-068c5a11ef2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_f3f780f2-3ea4-4d3c-988e-da04912aa794" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_2f045ee6-2399-4d47-9a4e-6c2502506d5a" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_f3f780f2-3ea4-4d3c-988e-da04912aa794" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_f3f780f2-3ea4-4d3c-988e-da04912aa794_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_f3f780f2-3ea4-4d3c-988e-da04912aa794" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_f3f780f2-3ea4-4d3c-988e-da04912aa794_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_36635c94-e14e-4ff8-b4aa-a256b8778475" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_f3f780f2-3ea4-4d3c-988e-da04912aa794" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_36635c94-e14e-4ff8-b4aa-a256b8778475" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_2ee76d1f-cf5c-47cd-b9be-2587a7a0e3b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_36635c94-e14e-4ff8-b4aa-a256b8778475" xlink:to="loc_us-gaap_RealEstateLoanMember_2ee76d1f-cf5c-47cd-b9be-2587a7a0e3b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_caa45e4b-156c-4970-bb7d-a35b9a427c2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_36635c94-e14e-4ff8-b4aa-a256b8778475" xlink:to="loc_us-gaap_CreditCardReceivablesMember_caa45e4b-156c-4970-bb7d-a35b9a427c2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_1509681a-44c9-4abd-a27d-84b79ec8b697" xlink:href="cbnk-20210930.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_36635c94-e14e-4ff8-b4aa-a256b8778475" xlink:to="loc_cbnk_OtherConsumerMember_1509681a-44c9-4abd-a27d-84b79ec8b697" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_AcquiredLoansMember_58896555-f280-4249-b464-04818a2d7127" xlink:href="cbnk-20210930.xsd#cbnk_AcquiredLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_36635c94-e14e-4ff8-b4aa-a256b8778475" xlink:to="loc_cbnk_AcquiredLoansMember_58896555-f280-4249-b464-04818a2d7127" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_e6907451-bb51-42f9-8aa8-fed8f9edd81e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_2f045ee6-2399-4d47-9a4e-6c2502506d5a" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_e6907451-bb51-42f9-8aa8-fed8f9edd81e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_e6907451-bb51-42f9-8aa8-fed8f9edd81e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_e6907451-bb51-42f9-8aa8-fed8f9edd81e" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_e6907451-bb51-42f9-8aa8-fed8f9edd81e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_2d38cfeb-3d45-4ff8-b422-ee71cbaaf4a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_e6907451-bb51-42f9-8aa8-fed8f9edd81e" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_2d38cfeb-3d45-4ff8-b422-ee71cbaaf4a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivables30To89DaysPastDueMember_7b6a38b9-6d70-40f3-b5f4-fb6b669de26b" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivables30To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_2d38cfeb-3d45-4ff8-b422-ee71cbaaf4a9" xlink:to="loc_cbnk_FinancingReceivables30To89DaysPastDueMember_7b6a38b9-6d70-40f3-b5f4-fb6b669de26b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_230519bd-fe63-4b7d-b0bb-0e89f9308427" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_2d38cfeb-3d45-4ff8-b422-ee71cbaaf4a9" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_230519bd-fe63-4b7d-b0bb-0e89f9308427" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_6f6cd914-cde7-48aa-ae59-83f76a17f0d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_2f045ee6-2399-4d47-9a4e-6c2502506d5a" xlink:to="loc_us-gaap_CollateralAxis_6f6cd914-cde7-48aa-ae59-83f76a17f0d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_6f6cd914-cde7-48aa-ae59-83f76a17f0d8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_6f6cd914-cde7-48aa-ae59-83f76a17f0d8" xlink:to="loc_us-gaap_CollateralDomain_6f6cd914-cde7-48aa-ae59-83f76a17f0d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_965f84f4-397a-4ddd-9535-d40b9922d82d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_6f6cd914-cde7-48aa-ae59-83f76a17f0d8" xlink:to="loc_us-gaap_CollateralDomain_965f84f4-397a-4ddd-9535-d40b9922d82d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_c4ed7e46-ed1d-4367-a2b4-ed18db523c3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_965f84f4-397a-4ddd-9535-d40b9922d82d" xlink:to="loc_us-gaap_ResidentialRealEstateMember_c4ed7e46-ed1d-4367-a2b4-ed18db523c3f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableImpairedLoansDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#PortfolioLoansReceivableImpairedLoansDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableImpairedLoansDetails" xlink:type="extended" id="i57f8573edd8a47b6a1f5e6d58c3cfa9a_PortfolioLoansReceivableImpairedLoansDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableImpairedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_847a8c18-04d7-471d-8934-65a7bf1d0751" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:to="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_847a8c18-04d7-471d-8934-65a7bf1d0751" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_f68062b5-0046-4863-ac9b-12bcf5e765e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_f68062b5-0046-4863-ac9b-12bcf5e765e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_d375e437-3c39-43a3-9eec-15d56d3eb390" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_d375e437-3c39-43a3-9eec-15d56d3eb390" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_b24cfd89-7d68-4735-be84-3a1721d77f26" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRecordedInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:to="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_b24cfd89-7d68-4735-be84-3a1721d77f26" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRelatedAllowance_172ba6ba-9ad2-493f-b8d8-860dafc11371" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRelatedAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:to="loc_us-gaap_ImpairedFinancingReceivableRelatedAllowance_172ba6ba-9ad2-493f-b8d8-860dafc11371" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_f0eb4539-3be2-4868-bfcb-e20fcce9301e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:to="loc_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_f0eb4539-3be2-4868-bfcb-e20fcce9301e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod_cc5c4b98-2b3c-4a2a-9939-e74b065f2e20" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:to="loc_us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod_cc5c4b98-2b3c-4a2a-9939-e74b065f2e20" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_8a0040f0-1427-4fcf-abe7-f04daf69651d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfImpairedFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_c3092c56-1b40-44e5-bb72-6921d3f599e6" xlink:to="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_8a0040f0-1427-4fcf-abe7-f04daf69651d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_0a3daabb-885e-40b5-95f2-5208db8dc8b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_8a0040f0-1427-4fcf-abe7-f04daf69651d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_0a3daabb-885e-40b5-95f2-5208db8dc8b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_0a3daabb-885e-40b5-95f2-5208db8dc8b2_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_0a3daabb-885e-40b5-95f2-5208db8dc8b2" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_0a3daabb-885e-40b5-95f2-5208db8dc8b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_409cad2f-499d-4bf3-b379-5bb135a234dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_0a3daabb-885e-40b5-95f2-5208db8dc8b2" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_409cad2f-499d-4bf3-b379-5bb135a234dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_6f618c08-6a00-4a85-a673-8795954c3f21" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_409cad2f-499d-4bf3-b379-5bb135a234dd" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_6f618c08-6a00-4a85-a673-8795954c3f21" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_216d071b-9eb4-4067-aa93-4af7c70d709b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_409cad2f-499d-4bf3-b379-5bb135a234dd" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_216d071b-9eb4-4067-aa93-4af7c70d709b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_fdd7250c-dc10-4ebc-b17a-f4cfea9e069e" xlink:href="cbnk-20210930.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_409cad2f-499d-4bf3-b379-5bb135a234dd" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_fdd7250c-dc10-4ebc-b17a-f4cfea9e069e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_0f3bce8d-575c-4b7a-adac-722c84f0036a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_409cad2f-499d-4bf3-b379-5bb135a234dd" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_0f3bce8d-575c-4b7a-adac-722c84f0036a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_f5032f1c-b308-45bf-ad17-da0e0eefda40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_8a0040f0-1427-4fcf-abe7-f04daf69651d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_f5032f1c-b308-45bf-ad17-da0e0eefda40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_f5032f1c-b308-45bf-ad17-da0e0eefda40_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_f5032f1c-b308-45bf-ad17-da0e0eefda40" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_f5032f1c-b308-45bf-ad17-da0e0eefda40_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a6aaa08c-ce4b-4d9d-bfc2-5800452b3a1d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_f5032f1c-b308-45bf-ad17-da0e0eefda40" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a6aaa08c-ce4b-4d9d-bfc2-5800452b3a1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_f549e0cc-94ea-4567-a138-744a916d7398" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a6aaa08c-ce4b-4d9d-bfc2-5800452b3a1d" xlink:to="loc_us-gaap_RealEstateLoanMember_f549e0cc-94ea-4567-a138-744a916d7398" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_d904f4b8-b1af-4342-a935-114b14c85cca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a6aaa08c-ce4b-4d9d-bfc2-5800452b3a1d" xlink:to="loc_us-gaap_CreditCardReceivablesMember_d904f4b8-b1af-4342-a935-114b14c85cca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_f63ebd2e-7174-4078-a0a9-7af15e9f7de7" xlink:href="cbnk-20210930.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a6aaa08c-ce4b-4d9d-bfc2-5800452b3a1d" xlink:to="loc_cbnk_OtherConsumerMember_f63ebd2e-7174-4078-a0a9-7af15e9f7de7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_AcquiredLoansMember_239d2feb-2c69-418c-a101-313e0fc16486" xlink:href="cbnk-20210930.xsd#cbnk_AcquiredLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a6aaa08c-ce4b-4d9d-bfc2-5800452b3a1d" xlink:to="loc_cbnk_AcquiredLoansMember_239d2feb-2c69-418c-a101-313e0fc16486" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableCreditQualityIndicatorsDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#PortfolioLoansReceivableCreditQualityIndicatorsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableCreditQualityIndicatorsDetails" xlink:type="extended" id="i697b38eacec44127ba5e09cabb6d3c8c_PortfolioLoansReceivableCreditQualityIndicatorsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_e2045732-8f4b-41df-ad81-2ffd98274d4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_6102647a-eb98-4ed3-97a3-7ed02eeaa1eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_e2045732-8f4b-41df-ad81-2ffd98274d4d" xlink:to="loc_us-gaap_NotesReceivableGross_6102647a-eb98-4ed3-97a3-7ed02eeaa1eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_74eda012-c957-47b9-be33-3fb06751884b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_e2045732-8f4b-41df-ad81-2ffd98274d4d" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_74eda012-c957-47b9-be33-3fb06751884b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a214f9b0-1008-4879-827b-557700ec22a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_74eda012-c957-47b9-be33-3fb06751884b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a214f9b0-1008-4879-827b-557700ec22a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_a214f9b0-1008-4879-827b-557700ec22a4_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a214f9b0-1008-4879-827b-557700ec22a4" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_a214f9b0-1008-4879-827b-557700ec22a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c66a5d46-3f0c-4e5e-903c-36c1c6ea74c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a214f9b0-1008-4879-827b-557700ec22a4" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c66a5d46-3f0c-4e5e-903c-36c1c6ea74c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_37dde9d8-9d43-4d49-b469-7e315ead9162" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c66a5d46-3f0c-4e5e-903c-36c1c6ea74c6" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_37dde9d8-9d43-4d49-b469-7e315ead9162" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_e71e9eba-ce06-4524-91b2-aa0a16a5a7d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c66a5d46-3f0c-4e5e-903c-36c1c6ea74c6" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_e71e9eba-ce06-4524-91b2-aa0a16a5a7d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ConstructionPortfolioSegmentMember_f982be52-647c-4ee4-a640-ca12ab5b9eec" xlink:href="cbnk-20210930.xsd#cbnk_ConstructionPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c66a5d46-3f0c-4e5e-903c-36c1c6ea74c6" xlink:to="loc_cbnk_ConstructionPortfolioSegmentMember_f982be52-647c-4ee4-a640-ca12ab5b9eec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_74be1ed7-c8f5-4edc-b2f2-f882f97ebbae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c66a5d46-3f0c-4e5e-903c-36c1c6ea74c6" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_74be1ed7-c8f5-4edc-b2f2-f882f97ebbae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_632b7f4a-52ab-45d7-9e08-be6a6c4d4cb3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_74eda012-c957-47b9-be33-3fb06751884b" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_632b7f4a-52ab-45d7-9e08-be6a6c4d4cb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_632b7f4a-52ab-45d7-9e08-be6a6c4d4cb3_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_632b7f4a-52ab-45d7-9e08-be6a6c4d4cb3" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_632b7f4a-52ab-45d7-9e08-be6a6c4d4cb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_ad859ef3-1aa4-4bb1-9407-2aa1e9d3da6f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_632b7f4a-52ab-45d7-9e08-be6a6c4d4cb3" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_ad859ef3-1aa4-4bb1-9407-2aa1e9d3da6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_667e7dd0-b110-4eea-be2b-1c72ec22f9d7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_ad859ef3-1aa4-4bb1-9407-2aa1e9d3da6f" xlink:to="loc_us-gaap_RealEstateLoanMember_667e7dd0-b110-4eea-be2b-1c72ec22f9d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_641c0016-6641-4931-936d-c524619c0fe6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_ad859ef3-1aa4-4bb1-9407-2aa1e9d3da6f" xlink:to="loc_us-gaap_CreditCardReceivablesMember_641c0016-6641-4931-936d-c524619c0fe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_8e9aca44-d2d4-49bc-bdf2-e64b67e8b063" xlink:href="cbnk-20210930.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_ad859ef3-1aa4-4bb1-9407-2aa1e9d3da6f" xlink:to="loc_cbnk_OtherConsumerMember_8e9aca44-d2d4-49bc-bdf2-e64b67e8b063" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_a4dde84d-b848-4083-ab58-52afb7c9d3e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_74eda012-c957-47b9-be33-3fb06751884b" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_a4dde84d-b848-4083-ab58-52afb7c9d3e3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_a4dde84d-b848-4083-ab58-52afb7c9d3e3_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_a4dde84d-b848-4083-ab58-52afb7c9d3e3" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_a4dde84d-b848-4083-ab58-52afb7c9d3e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_e5cb1cb2-8169-40d6-b3eb-287650905f42" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_a4dde84d-b848-4083-ab58-52afb7c9d3e3" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_e5cb1cb2-8169-40d6-b3eb-287650905f42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassMember_745f9b31-73f3-4c76-bf61-69f58be72544" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_e5cb1cb2-8169-40d6-b3eb-287650905f42" xlink:to="loc_us-gaap_PassMember_745f9b31-73f3-4c76-bf61-69f58be72544" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SpecialMentionMember_3f999ab1-db89-489b-b25a-fa7e6c084b99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SpecialMentionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_e5cb1cb2-8169-40d6-b3eb-287650905f42" xlink:to="loc_us-gaap_SpecialMentionMember_3f999ab1-db89-489b-b25a-fa7e6c084b99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubstandardMember_c63e304d-8936-4a39-9914-ed9984dfabe6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubstandardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_e5cb1cb2-8169-40d6-b3eb-287650905f42" xlink:to="loc_us-gaap_SubstandardMember_c63e304d-8936-4a39-9914-ed9984dfabe6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DoubtfulMember_c145db77-db39-4ef8-8714-40347a2e6455" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DoubtfulMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_e5cb1cb2-8169-40d6-b3eb-287650905f42" xlink:to="loc_us-gaap_DoubtfulMember_c145db77-db39-4ef8-8714-40347a2e6455" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableTroubleDebtRestructuringDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#PortfolioLoansReceivableTroubleDebtRestructuringDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableTroubleDebtRestructuringDetails" xlink:type="extended" id="i2051b554250c4289a23516cc3befd247_PortfolioLoansReceivableTroubleDebtRestructuringDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsLineItems_af4d2af2-78e0-4964-9be4-4a8bfde98cc2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsNumberOfContracts2_c2f24c90-b0e2-4986-b670-477d3f5bbcf1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsNumberOfContracts2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_af4d2af2-78e0-4964-9be4-4a8bfde98cc2" xlink:to="loc_us-gaap_FinancingReceivableModificationsNumberOfContracts2_c2f24c90-b0e2-4986-b670-477d3f5bbcf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsRecordedInvestment_fd1d4126-a81c-4ba5-9ad1-eeb02bd5a00b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsRecordedInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_af4d2af2-78e0-4964-9be4-4a8bfde98cc2" xlink:to="loc_us-gaap_FinancingReceivableModificationsRecordedInvestment_fd1d4126-a81c-4ba5-9ad1-eeb02bd5a00b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_2aa02ac7-a2bc-47a2-a952-1c974d6dc06c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_af4d2af2-78e0-4964-9be4-4a8bfde98cc2" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_2aa02ac7-a2bc-47a2-a952-1c974d6dc06c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_8afef569-3e95-4681-b0a5-c81ec6c190d7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentPerformanceStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_2aa02ac7-a2bc-47a2-a952-1c974d6dc06c" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_8afef569-3e95-4681-b0a5-c81ec6c190d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_8afef569-3e95-4681-b0a5-c81ec6c190d7_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_8afef569-3e95-4681-b0a5-c81ec6c190d7" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_8afef569-3e95-4681-b0a5-c81ec6c190d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_586cdd20-c045-4c49-aed6-20fc6a274239" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_8afef569-3e95-4681-b0a5-c81ec6c190d7" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_586cdd20-c045-4c49-aed6-20fc6a274239" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformingFinancingReceivableMember_887279fc-456a-406e-8484-4f1803d2dcf6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformingFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_586cdd20-c045-4c49-aed6-20fc6a274239" xlink:to="loc_us-gaap_PerformingFinancingReceivableMember_887279fc-456a-406e-8484-4f1803d2dcf6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonperformingFinancingReceivableMember_88b4f309-94f9-4d7b-a366-8944a5f61217" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonperformingFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_586cdd20-c045-4c49-aed6-20fc6a274239" xlink:to="loc_us-gaap_NonperformingFinancingReceivableMember_88b4f309-94f9-4d7b-a366-8944a5f61217" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_7f787575-36e9-4896-8fbe-ea9519c600a8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_2aa02ac7-a2bc-47a2-a952-1c974d6dc06c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_7f787575-36e9-4896-8fbe-ea9519c600a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_7f787575-36e9-4896-8fbe-ea9519c600a8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_7f787575-36e9-4896-8fbe-ea9519c600a8" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_7f787575-36e9-4896-8fbe-ea9519c600a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_567831c2-e72d-4108-8601-b1efadc6a3c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_7f787575-36e9-4896-8fbe-ea9519c600a8" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_567831c2-e72d-4108-8601-b1efadc6a3c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_ed842c30-6421-46af-901d-a4b15327354b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_567831c2-e72d-4108-8601-b1efadc6a3c0" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_ed842c30-6421-46af-901d-a4b15327354b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_008202d7-0b4f-47bc-9681-07c059a7aa56" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_567831c2-e72d-4108-8601-b1efadc6a3c0" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_008202d7-0b4f-47bc-9681-07c059a7aa56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_a33b45ef-0cc6-4c1d-84c5-5ce7a056bf2c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_2aa02ac7-a2bc-47a2-a952-1c974d6dc06c" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_a33b45ef-0cc6-4c1d-84c5-5ce7a056bf2c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a33b45ef-0cc6-4c1d-84c5-5ce7a056bf2c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_a33b45ef-0cc6-4c1d-84c5-5ce7a056bf2c" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_a33b45ef-0cc6-4c1d-84c5-5ce7a056bf2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_891803ae-6697-4174-87b2-50a18555d36f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_a33b45ef-0cc6-4c1d-84c5-5ce7a056bf2c" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_891803ae-6697-4174-87b2-50a18555d36f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_6a383610-436c-4562-b8fc-fb29980efda2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_891803ae-6697-4174-87b2-50a18555d36f" xlink:to="loc_us-gaap_RealEstateLoanMember_6a383610-436c-4562-b8fc-fb29980efda2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_AcquiredLoansMember_2acc3c81-9f4e-438e-8636-cf6d064183ff" xlink:href="cbnk-20210930.xsd#cbnk_AcquiredLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_891803ae-6697-4174-87b2-50a18555d36f" xlink:to="loc_cbnk_AcquiredLoansMember_2acc3c81-9f4e-438e-8636-cf6d064183ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableModificationStatusAxis_78c039ee-d069-4079-9a48-077a3c12c590" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableModificationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_2aa02ac7-a2bc-47a2-a952-1c974d6dc06c" xlink:to="loc_cbnk_FinancingReceivableModificationStatusAxis_78c039ee-d069-4079-9a48-077a3c12c590" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableModificationStatusDomain_78c039ee-d069-4079-9a48-077a3c12c590_default" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableModificationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cbnk_FinancingReceivableModificationStatusAxis_78c039ee-d069-4079-9a48-077a3c12c590" xlink:to="loc_cbnk_FinancingReceivableModificationStatusDomain_78c039ee-d069-4079-9a48-077a3c12c590_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_FinancingReceivableModificationStatusDomain_5b522a9b-0f0b-49b7-beba-2e0384d02729" xlink:href="cbnk-20210930.xsd#cbnk_FinancingReceivableModificationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cbnk_FinancingReceivableModificationStatusAxis_78c039ee-d069-4079-9a48-077a3c12c590" xlink:to="loc_cbnk_FinancingReceivableModificationStatusDomain_5b522a9b-0f0b-49b7-beba-2e0384d02729" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_NewTDRMember_0ab5534e-bd2b-440d-9d9f-60c61dc736bb" xlink:href="cbnk-20210930.xsd#cbnk_NewTDRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_FinancingReceivableModificationStatusDomain_5b522a9b-0f0b-49b7-beba-2e0384d02729" xlink:to="loc_cbnk_NewTDRMember_0ab5534e-bd2b-440d-9d9f-60c61dc736bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_PaidOffTDRMember_0b91b4ce-8f30-410a-876f-5274f3e267af" xlink:href="cbnk-20210930.xsd#cbnk_PaidOffTDRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbnk_FinancingReceivableModificationStatusDomain_5b522a9b-0f0b-49b7-beba-2e0384d02729" xlink:to="loc_cbnk_PaidOffTDRMember_0b91b4ce-8f30-410a-876f-5274f3e267af" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableOutstandingLoanCommitmentsDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#PortfolioLoansReceivableOutstandingLoanCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableOutstandingLoanCommitmentsDetails" xlink:type="extended" id="ic396dba6e6854f48aae3de288b8fc00d_PortfolioLoansReceivableOutstandingLoanCommitmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_e2e8d572-f412-476c-89a3-3bdb8e05cba1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusedCommitmentsToExtendCredit_702c6555-0b2f-4ac3-8332-b0b1c14ab068" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnusedCommitmentsToExtendCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_e2e8d572-f412-476c-89a3-3bdb8e05cba1" xlink:to="loc_us-gaap_UnusedCommitmentsToExtendCredit_702c6555-0b2f-4ac3-8332-b0b1c14ab068" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_93d44b4c-28e1-4141-a82d-16ab2e0167af" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_e2e8d572-f412-476c-89a3-3bdb8e05cba1" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_93d44b4c-28e1-4141-a82d-16ab2e0167af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_4546af3c-2d41-425d-9464-273d1a7fd9be" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_e2e8d572-f412-476c-89a3-3bdb8e05cba1" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_4546af3c-2d41-425d-9464-273d1a7fd9be" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_8ab56061-a9a3-4725-b200-57072fcb5d53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_4546af3c-2d41-425d-9464-273d1a7fd9be" xlink:to="loc_us-gaap_FinancialInstrumentAxis_8ab56061-a9a3-4725-b200-57072fcb5d53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8ab56061-a9a3-4725-b200-57072fcb5d53_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_8ab56061-a9a3-4725-b200-57072fcb5d53" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8ab56061-a9a3-4725-b200-57072fcb5d53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6e73978e-34b7-42c8-a951-af422cb22568" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_8ab56061-a9a3-4725-b200-57072fcb5d53" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6e73978e-34b7-42c8-a951-af422cb22568" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsToExtendCreditMember_8953f2b6-d786-45fc-b72a-e57fa12e98eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsToExtendCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_6e73978e-34b7-42c8-a951-af422cb22568" xlink:to="loc_us-gaap_CommitmentsToExtendCreditMember_8953f2b6-d786-45fc-b72a-e57fa12e98eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_14edd3a8-96ae-499b-b1f9-0837838ec30d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_4546af3c-2d41-425d-9464-273d1a7fd9be" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_14edd3a8-96ae-499b-b1f9-0837838ec30d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_14edd3a8-96ae-499b-b1f9-0837838ec30d_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_14edd3a8-96ae-499b-b1f9-0837838ec30d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_14edd3a8-96ae-499b-b1f9-0837838ec30d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e100c45-9f94-45f1-a389-e5864d0d567b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_14edd3a8-96ae-499b-b1f9-0837838ec30d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e100c45-9f94-45f1-a389-e5864d0d567b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_2ea0dd81-6e13-425f-b19e-b4192647b2c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e100c45-9f94-45f1-a389-e5864d0d567b" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_2ea0dd81-6e13-425f-b19e-b4192647b2c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_bee95b55-d123-43fa-a9d5-60448bbbee9b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e100c45-9f94-45f1-a389-e5864d0d567b" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_bee95b55-d123-43fa-a9d5-60448bbbee9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_9d388b86-16ef-4915-91eb-24406389e154" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e100c45-9f94-45f1-a389-e5864d0d567b" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_9d388b86-16ef-4915-91eb-24406389e154" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_09ffa0df-1184-4d77-ae72-b84bd55a5637" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e100c45-9f94-45f1-a389-e5864d0d567b" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_09ffa0df-1184-4d77-ae72-b84bd55a5637" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_5dce88fe-9aba-411d-acab-354fa059032a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_4546af3c-2d41-425d-9464-273d1a7fd9be" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_5dce88fe-9aba-411d-acab-354fa059032a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_5dce88fe-9aba-411d-acab-354fa059032a_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_5dce88fe-9aba-411d-acab-354fa059032a" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_5dce88fe-9aba-411d-acab-354fa059032a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c4c799f0-338c-48b3-9cd1-97b3500c2748" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_5dce88fe-9aba-411d-acab-354fa059032a" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c4c799f0-338c-48b3-9cd1-97b3500c2748" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_9ee43f11-ae1a-4501-9780-c925cd13a871" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c4c799f0-338c-48b3-9cd1-97b3500c2748" xlink:to="loc_us-gaap_RealEstateLoanMember_9ee43f11-ae1a-4501-9780-c925cd13a871" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeEquityLoanMember_fc9577da-728d-4cbc-a350-eca3ce8e197f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HomeEquityLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c4c799f0-338c-48b3-9cd1-97b3500c2748" xlink:to="loc_us-gaap_HomeEquityLoanMember_fc9577da-728d-4cbc-a350-eca3ce8e197f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionLoansMember_da66a9c5-a569-4781-924b-8fedc089eea4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c4c799f0-338c-48b3-9cd1-97b3500c2748" xlink:to="loc_us-gaap_ConstructionLoansMember_da66a9c5-a569-4781-924b-8fedc089eea4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditCardReceivablesMember_e4393cd1-d4aa-42b0-b5e6-3dddc0a3263c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c4c799f0-338c-48b3-9cd1-97b3500c2748" xlink:to="loc_us-gaap_CreditCardReceivablesMember_e4393cd1-d4aa-42b0-b5e6-3dddc0a3263c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OtherConsumerMember_d9569f2a-36ca-445a-a78d-cf22f5972631" xlink:href="cbnk-20210930.xsd#cbnk_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c4c799f0-338c-48b3-9cd1-97b3500c2748" xlink:to="loc_cbnk_OtherConsumerMember_d9569f2a-36ca-445a-a78d-cf22f5972631" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LoansHeldForSaleMember_08a8625b-1c63-46a9-9ab0-a6244b14bee2" xlink:href="cbnk-20210930.xsd#cbnk_LoansHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_c4c799f0-338c-48b3-9cd1-97b3500c2748" xlink:to="loc_cbnk_LoansHeldForSaleMember_08a8625b-1c63-46a9-9ab0-a6244b14bee2" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/PortfolioLoansReceivableActivityinAllowanceforLoanLossesDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#PortfolioLoansReceivableActivityinAllowanceforLoanLossesDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/PortfolioLoansReceivableActivityinAllowanceforLoanLossesDetails" xlink:type="extended" id="id3fbfc473cde4174a7fd97c46c93ec76_PortfolioLoansReceivableActivityinAllowanceforLoanLossesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_d2fd12f3-0945-4067-a07b-303bf38e21c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_e860e6a2-eb88-4549-8f06-ee820e0e2b99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_d2fd12f3-0945-4067-a07b-303bf38e21c9" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_e860e6a2-eb88-4549-8f06-ee820e0e2b99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_66df81f6-4fd8-4d5e-8b99-a15ab7586934" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_e860e6a2-eb88-4549-8f06-ee820e0e2b99" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_66df81f6-4fd8-4d5e-8b99-a15ab7586934" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_a70fc0d2-923a-4ff9-a73c-5e77c8b34e60" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_e860e6a2-eb88-4549-8f06-ee820e0e2b99" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_a70fc0d2-923a-4ff9-a73c-5e77c8b34e60" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_00d0c053-1f52-4c15-8a61-34a5ca10cb42" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_e860e6a2-eb88-4549-8f06-ee820e0e2b99" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_00d0c053-1f52-4c15-8a61-34a5ca10cb42" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_16be6432-8c55-4006-aef3-2ae7c9df42cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_e860e6a2-eb88-4549-8f06-ee820e0e2b99" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_16be6432-8c55-4006-aef3-2ae7c9df42cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_4d4e1e30-8ec3-4871-8e89-c65b75f1dc4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_5edd5bc2-67c5-4c7a-8ff1-fffcf2f2fd0b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_d2fd12f3-0945-4067-a07b-303bf38e21c9" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_5edd5bc2-67c5-4c7a-8ff1-fffcf2f2fd0b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_9f8499c3-e642-434f-9d54-a96803212e19" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_5edd5bc2-67c5-4c7a-8ff1-fffcf2f2fd0b" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_9f8499c3-e642-434f-9d54-a96803212e19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_9f8499c3-e642-434f-9d54-a96803212e19_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_9f8499c3-e642-434f-9d54-a96803212e19" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_9f8499c3-e642-434f-9d54-a96803212e19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_96f5e2b4-abf0-4ad9-868a-ff3ffe04d970" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_9f8499c3-e642-434f-9d54-a96803212e19" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_96f5e2b4-abf0-4ad9-868a-ff3ffe04d970" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnfundedLoanCommitmentMember_e1ab63bb-2f53-468a-babd-130468e6f7aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnfundedLoanCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_96f5e2b4-abf0-4ad9-868a-ff3ffe04d970" xlink:to="loc_us-gaap_UnfundedLoanCommitmentMember_e1ab63bb-2f53-468a-babd-130468e6f7aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_MortgageLoansSoldMember_49f10afe-03a4-4eb4-ba37-5b34e8c483bc" xlink:href="cbnk-20210930.xsd#cbnk_MortgageLoansSoldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_96f5e2b4-abf0-4ad9-868a-ff3ffe04d970" xlink:to="loc_cbnk_MortgageLoansSoldMember_49f10afe-03a4-4eb4-ba37-5b34e8c483bc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/DerivativeFinancialInstrumentsDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#DerivativeFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/DerivativeFinancialInstrumentsDetails" xlink:type="extended" id="i8f4d95fbe14d4cf8aedc40bfc3921e52_DerivativeFinancialInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_2ca68e98-b9ef-4bc7-8268-8a6459edd047" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_b0e7b758-0b72-452e-b8c1-d157ceddfd65" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_2ca68e98-b9ef-4bc7-8268-8a6459edd047" xlink:to="loc_us-gaap_DerivativeNotionalAmount_b0e7b758-0b72-452e-b8c1-d157ceddfd65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_a31989d1-f611-47e9-bb89-334652978480" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_2ca68e98-b9ef-4bc7-8268-8a6459edd047" xlink:to="loc_us-gaap_DerivativeLiabilities_a31989d1-f611-47e9-bb89-334652978480" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_387c2aa3-112d-4969-b463-062feeb670dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_2ca68e98-b9ef-4bc7-8268-8a6459edd047" xlink:to="loc_us-gaap_DerivativeAssets_387c2aa3-112d-4969-b463-062feeb670dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_9a905771-4d4f-42d7-8be9-8fccda33cd31" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_2ca68e98-b9ef-4bc7-8268-8a6459edd047" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_9a905771-4d4f-42d7-8be9-8fccda33cd31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_3cd28892-caa4-47ad-8f54-fa90f7e8c616" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_9a905771-4d4f-42d7-8be9-8fccda33cd31" xlink:to="loc_us-gaap_HedgingDesignationAxis_3cd28892-caa4-47ad-8f54-fa90f7e8c616" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_3cd28892-caa4-47ad-8f54-fa90f7e8c616_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_3cd28892-caa4-47ad-8f54-fa90f7e8c616" xlink:to="loc_us-gaap_HedgingDesignationDomain_3cd28892-caa4-47ad-8f54-fa90f7e8c616_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_0c1dbfa9-0778-4849-9acc-57128a67e810" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_3cd28892-caa4-47ad-8f54-fa90f7e8c616" xlink:to="loc_us-gaap_HedgingDesignationDomain_0c1dbfa9-0778-4849-9acc-57128a67e810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_d1e32608-31ce-4e2d-ae76-f9eb91c81392" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_0c1dbfa9-0778-4849-9acc-57128a67e810" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_d1e32608-31ce-4e2d-ae76-f9eb91c81392" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_97091a05-0285-47f1-9140-ca1f8f0a9508" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_9a905771-4d4f-42d7-8be9-8fccda33cd31" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_97091a05-0285-47f1-9140-ca1f8f0a9508" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_97091a05-0285-47f1-9140-ca1f8f0a9508_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_97091a05-0285-47f1-9140-ca1f8f0a9508" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_97091a05-0285-47f1-9140-ca1f8f0a9508_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_e92168ae-74a1-4990-b81e-a3cd59aa3ad2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_97091a05-0285-47f1-9140-ca1f8f0a9508" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_e92168ae-74a1-4990-b81e-a3cd59aa3ad2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenForwardDeliverySalesAgreementMember_c24f9e36-6787-4655-940f-c97058d519d6" xlink:href="cbnk-20210930.xsd#cbnk_OpenForwardDeliverySalesAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_e92168ae-74a1-4990-b81e-a3cd59aa3ad2" xlink:to="loc_cbnk_OpenForwardDeliverySalesAgreementMember_c24f9e36-6787-4655-940f-c97058d519d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenMandatoryDeliveryCommitmentsMember_512d04c2-40e1-4cb5-8385-54eb6007bd5a" xlink:href="cbnk-20210930.xsd#cbnk_OpenMandatoryDeliveryCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_e92168ae-74a1-4990-b81e-a3cd59aa3ad2" xlink:to="loc_cbnk_OpenMandatoryDeliveryCommitmentsMember_512d04c2-40e1-4cb5-8385-54eb6007bd5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_ebf94741-fa47-45c1-8a37-f41e9260de47" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_e92168ae-74a1-4990-b81e-a3cd59aa3ad2" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_ebf94741-fa47-45c1-8a37-f41e9260de47" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/LeasesAdditionalInformationDetails" xlink:type="extended" id="i59db3f51724b4460a58072804d500371_LeasesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_80fad9b1-8c1f-41fe-a77e-d146e8a125cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LesseeOperatingLeaseNumberOfFullServiceBranches_b4b7841b-60cc-4756-9902-38cab4132cd2" xlink:href="cbnk-20210930.xsd#cbnk_LesseeOperatingLeaseNumberOfFullServiceBranches"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_80fad9b1-8c1f-41fe-a77e-d146e8a125cb" xlink:to="loc_cbnk_LesseeOperatingLeaseNumberOfFullServiceBranches_b4b7841b-60cc-4756-9902-38cab4132cd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LesseeOperatingLeaseNumberOfLocations_49c7a259-a329-4f52-9fa4-b065db4eed71" xlink:href="cbnk-20210930.xsd#cbnk_LesseeOperatingLeaseNumberOfLocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_80fad9b1-8c1f-41fe-a77e-d146e8a125cb" xlink:to="loc_cbnk_LesseeOperatingLeaseNumberOfLocations_49c7a259-a329-4f52-9fa4-b065db4eed71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_bb49a8d2-e0bd-4523-8dbf-e2801217c845" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_80fad9b1-8c1f-41fe-a77e-d146e8a125cb" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_bb49a8d2-e0bd-4523-8dbf-e2801217c845" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OperatingLeaseRightOfUseAssetNet_d01c9253-0b2e-4ed5-9baa-deb87af0b7c2" xlink:href="cbnk-20210930.xsd#cbnk_OperatingLeaseRightOfUseAssetNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_80fad9b1-8c1f-41fe-a77e-d146e8a125cb" xlink:to="loc_cbnk_OperatingLeaseRightOfUseAssetNet_d01c9253-0b2e-4ed5-9baa-deb87af0b7c2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_49ebd6b7-b291-4066-8e2e-37da60b288ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_80fad9b1-8c1f-41fe-a77e-d146e8a125cb" xlink:to="loc_us-gaap_OperatingLeaseLiability_49ebd6b7-b291-4066-8e2e-37da60b288ee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LesseeOperatingLeaseRemainingTermOfContract_47574ddd-caa7-4f5d-8157-c8a8bd2a6b1f" xlink:href="cbnk-20210930.xsd#cbnk_LesseeOperatingLeaseRemainingTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_80fad9b1-8c1f-41fe-a77e-d146e8a125cb" xlink:to="loc_cbnk_LesseeOperatingLeaseRemainingTermOfContract_47574ddd-caa7-4f5d-8157-c8a8bd2a6b1f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_a0018c5c-9d43-40d1-83fc-fa1ba00c0b0a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_80fad9b1-8c1f-41fe-a77e-d146e8a125cb" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_a0018c5c-9d43-40d1-83fc-fa1ba00c0b0a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_88007a29-22aa-47c9-a980-d8f42650a00f" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_a0018c5c-9d43-40d1-83fc-fa1ba00c0b0a" xlink:to="loc_srt_RangeAxis_88007a29-22aa-47c9-a980-d8f42650a00f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_88007a29-22aa-47c9-a980-d8f42650a00f_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_88007a29-22aa-47c9-a980-d8f42650a00f" xlink:to="loc_srt_RangeMember_88007a29-22aa-47c9-a980-d8f42650a00f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0146f228-9680-4533-b8e7-519dab45550e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_88007a29-22aa-47c9-a980-d8f42650a00f" xlink:to="loc_srt_RangeMember_0146f228-9680-4533-b8e7-519dab45550e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_6030bb9b-c982-43b8-9c76-74d0f0131381" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0146f228-9680-4533-b8e7-519dab45550e" xlink:to="loc_srt_MinimumMember_6030bb9b-c982-43b8-9c76-74d0f0131381" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4008902e-1e96-43a8-9558-5e135cee9492" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0146f228-9680-4533-b8e7-519dab45550e" xlink:to="loc_srt_MaximumMember_4008902e-1e96-43a8-9558-5e135cee9492" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueFinancialInstrumentsMeasuredatFVonRecurringBasisDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#FairValueFinancialInstrumentsMeasuredatFVonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueFinancialInstrumentsMeasuredatFVonRecurringBasisDetails" xlink:type="extended" id="i0dd97661e6e841568ea17e753ac27782_FairValueFinancialInstrumentsMeasuredatFVonRecurringBasisDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d24e82a4-1e77-41de-a300-ab8c16d61b1b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_384a53bb-0820-4566-a993-b988b52e3af3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d24e82a4-1e77-41de-a300-ab8c16d61b1b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_384a53bb-0820-4566-a993-b988b52e3af3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_c708b5dc-15cb-4c1a-bb82-76543cf1cf9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d24e82a4-1e77-41de-a300-ab8c16d61b1b" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_c708b5dc-15cb-4c1a-bb82-76543cf1cf9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_a755e9c3-4e9e-45e0-99a9-c1d4027bff5b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d24e82a4-1e77-41de-a300-ab8c16d61b1b" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_a755e9c3-4e9e-45e0-99a9-c1d4027bff5b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_bba258a5-b5a4-4550-b1a3-a43f1e3fd74e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d24e82a4-1e77-41de-a300-ab8c16d61b1b" xlink:to="loc_us-gaap_DerivativeAssets_bba258a5-b5a4-4550-b1a3-a43f1e3fd74e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_fde9623e-178c-4458-b026-6e7dd06384b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d24e82a4-1e77-41de-a300-ab8c16d61b1b" xlink:to="loc_us-gaap_DerivativeLiabilities_fde9623e-178c-4458-b026-6e7dd06384b8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1c773720-e642-45a1-8c20-476076bbaa82" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d24e82a4-1e77-41de-a300-ab8c16d61b1b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1c773720-e642-45a1-8c20-476076bbaa82" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_88cf17d4-14cc-48fa-bed8-14b2c095a5e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1c773720-e642-45a1-8c20-476076bbaa82" xlink:to="loc_us-gaap_FinancialInstrumentAxis_88cf17d4-14cc-48fa-bed8-14b2c095a5e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_88cf17d4-14cc-48fa-bed8-14b2c095a5e5_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_88cf17d4-14cc-48fa-bed8-14b2c095a5e5" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_88cf17d4-14cc-48fa-bed8-14b2c095a5e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_64cfd6fb-08ae-4f69-9aa2-bdb7194cbd14" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_88cf17d4-14cc-48fa-bed8-14b2c095a5e5" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_64cfd6fb-08ae-4f69-9aa2-bdb7194cbd14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_2b0126d2-bdb4-4dc8-8905-8199d5907b00" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_64cfd6fb-08ae-4f69-9aa2-bdb7194cbd14" xlink:to="loc_us-gaap_MunicipalBondsMember_2b0126d2-bdb4-4dc8-8905-8199d5907b00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_b51b8612-c971-4dfb-8686-8a86b8312d3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_64cfd6fb-08ae-4f69-9aa2-bdb7194cbd14" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_b51b8612-c971-4dfb-8686-8a86b8312d3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_f6219a24-ceb3-4896-be33-cf9bd30d3d9e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_64cfd6fb-08ae-4f69-9aa2-bdb7194cbd14" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_f6219a24-ceb3-4896-be33-cf9bd30d3d9e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_593a6835-f380-4a61-98f5-6232ce600bab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_64cfd6fb-08ae-4f69-9aa2-bdb7194cbd14" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_593a6835-f380-4a61-98f5-6232ce600bab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_6f32c779-ae70-47fe-9de7-680bde33351c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_64cfd6fb-08ae-4f69-9aa2-bdb7194cbd14" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_6f32c779-ae70-47fe-9de7-680bde33351c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9c9c9935-ecb7-486f-86fe-0c3b65956a9e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1c773720-e642-45a1-8c20-476076bbaa82" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9c9c9935-ecb7-486f-86fe-0c3b65956a9e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9c9c9935-ecb7-486f-86fe-0c3b65956a9e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9c9c9935-ecb7-486f-86fe-0c3b65956a9e" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9c9c9935-ecb7-486f-86fe-0c3b65956a9e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_988d848a-9fdb-42e9-88fc-189cabacba8d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9c9c9935-ecb7-486f-86fe-0c3b65956a9e" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_988d848a-9fdb-42e9-88fc-189cabacba8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_0befddff-5e65-4dc0-87b3-4a6d0952cc99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_988d848a-9fdb-42e9-88fc-189cabacba8d" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_0befddff-5e65-4dc0-87b3-4a6d0952cc99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e1461366-18c1-45a0-b8f0-c2a6ea7f9e48" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1c773720-e642-45a1-8c20-476076bbaa82" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e1461366-18c1-45a0-b8f0-c2a6ea7f9e48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e1461366-18c1-45a0-b8f0-c2a6ea7f9e48_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e1461366-18c1-45a0-b8f0-c2a6ea7f9e48" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e1461366-18c1-45a0-b8f0-c2a6ea7f9e48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c7321b50-b02f-40e2-b30e-86f0f3a8f4ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e1461366-18c1-45a0-b8f0-c2a6ea7f9e48" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c7321b50-b02f-40e2-b30e-86f0f3a8f4ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_95ab2e2b-130d-484d-9ea7-ee2f0c980029" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c7321b50-b02f-40e2-b30e-86f0f3a8f4ce" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_95ab2e2b-130d-484d-9ea7-ee2f0c980029" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_23ae2ea3-da23-4227-9093-0620be9756e6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c7321b50-b02f-40e2-b30e-86f0f3a8f4ce" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_23ae2ea3-da23-4227-9093-0620be9756e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_0ffc9de4-dde4-4007-bec5-24324060f94f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c7321b50-b02f-40e2-b30e-86f0f3a8f4ce" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_0ffc9de4-dde4-4007-bec5-24324060f94f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueLoansHeldForSaleDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#FairValueLoansHeldForSaleDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueLoansHeldForSaleDetails" xlink:type="extended" id="i7a68c71ce8f54431aed41b785c8bf713_FairValueLoansHeldForSaleDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_5215788e-52a4-4968-9d72-0fb49b8c0c76" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_4a9afa95-3fe0-4440-bf1f-3f97841e650c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_5215788e-52a4-4968-9d72-0fb49b8c0c76" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_4a9afa95-3fe0-4440-bf1f-3f97841e650c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_a3ff62fb-6507-4f66-9058-1767b32cebf0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_5215788e-52a4-4968-9d72-0fb49b8c0c76" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_a3ff62fb-6507-4f66-9058-1767b32cebf0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_0a9dacf7-57ff-4344-ae16-6a4dc45f63f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_a3ff62fb-6507-4f66-9058-1767b32cebf0" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_0a9dacf7-57ff-4344-ae16-6a4dc45f63f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_0a9dacf7-57ff-4344-ae16-6a4dc45f63f7_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_0a9dacf7-57ff-4344-ae16-6a4dc45f63f7" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_0a9dacf7-57ff-4344-ae16-6a4dc45f63f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2842cb42-e2a2-4644-83f5-61efa7f8ae38" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_0a9dacf7-57ff-4344-ae16-6a4dc45f63f7" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2842cb42-e2a2-4644-83f5-61efa7f8ae38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_8065caec-ef6f-46a0-8825-815d9bf31022" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2842cb42-e2a2-4644-83f5-61efa7f8ae38" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_8065caec-ef6f-46a0-8825-815d9bf31022" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_65f40316-bb35-411e-ab28-00ac0ec4dc02" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2842cb42-e2a2-4644-83f5-61efa7f8ae38" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_65f40316-bb35-411e-ab28-00ac0ec4dc02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_4bd44547-3117-4d84-919c-78cdb14e96c7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2842cb42-e2a2-4644-83f5-61efa7f8ae38" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_4bd44547-3117-4d84-919c-78cdb14e96c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeDuringPeriodFairValueDisclosureMember_d7ffad57-3328-4239-a82a-6e792474118f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ChangeDuringPeriodFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2842cb42-e2a2-4644-83f5-61efa7f8ae38" xlink:to="loc_us-gaap_ChangeDuringPeriodFairValueDisclosureMember_d7ffad57-3328-4239-a82a-6e792474118f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueImpairedLoansandForeclosedRealEstateDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#FairValueImpairedLoansandForeclosedRealEstateDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueImpairedLoansandForeclosedRealEstateDetails" xlink:type="extended" id="icec8d7ecb4084ac38b7d0d5742d0acac_FairValueImpairedLoansandForeclosedRealEstateDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_303a0a14-34d2-49e6-9dc9-4a16fd81a793" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_c7d7a4e5-f753-431b-8b38-ac978d4a133b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_303a0a14-34d2-49e6-9dc9-4a16fd81a793" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_c7d7a4e5-f753-431b-8b38-ac978d4a133b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRelatedAllowance_af680b6b-fe28-4627-acd8-a6758a9ee0ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRelatedAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_303a0a14-34d2-49e6-9dc9-4a16fd81a793" xlink:to="loc_us-gaap_ImpairedFinancingReceivableRelatedAllowance_af680b6b-fe28-4627-acd8-a6758a9ee0ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_ba5850bd-2246-4d73-aff5-ca02605190c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRecordedInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_303a0a14-34d2-49e6-9dc9-4a16fd81a793" xlink:to="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_ba5850bd-2246-4d73-aff5-ca02605190c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAcquiredThroughForeclosure_cd7718ea-8a6c-44c7-b333-853167624c2a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateAcquiredThroughForeclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_303a0a14-34d2-49e6-9dc9-4a16fd81a793" xlink:to="loc_us-gaap_RealEstateAcquiredThroughForeclosure_cd7718ea-8a6c-44c7-b333-853167624c2a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_ImpairedFinancingReceivableMeasurementInput_44b1b48e-e4c4-4f22-bc20-307729cac5e7" xlink:href="cbnk-20210930.xsd#cbnk_ImpairedFinancingReceivableMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_303a0a14-34d2-49e6-9dc9-4a16fd81a793" xlink:to="loc_cbnk_ImpairedFinancingReceivableMeasurementInput_44b1b48e-e4c4-4f22-bc20-307729cac5e7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_RealEstateAcquiredThroughForeclosureMeasurementInput_e758489e-cbcb-4117-935f-e2cde8adb2e9" xlink:href="cbnk-20210930.xsd#cbnk_RealEstateAcquiredThroughForeclosureMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_303a0a14-34d2-49e6-9dc9-4a16fd81a793" xlink:to="loc_cbnk_RealEstateAcquiredThroughForeclosureMeasurementInput_e758489e-cbcb-4117-935f-e2cde8adb2e9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_64901e1d-216d-4b9c-ad36-0bd6869cae97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_303a0a14-34d2-49e6-9dc9-4a16fd81a793" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_64901e1d-216d-4b9c-ad36-0bd6869cae97" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_327b5af0-7aa7-4611-b7cb-bfc2be28accd" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_64901e1d-216d-4b9c-ad36-0bd6869cae97" xlink:to="loc_srt_RangeAxis_327b5af0-7aa7-4611-b7cb-bfc2be28accd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_327b5af0-7aa7-4611-b7cb-bfc2be28accd_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_327b5af0-7aa7-4611-b7cb-bfc2be28accd" xlink:to="loc_srt_RangeMember_327b5af0-7aa7-4611-b7cb-bfc2be28accd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2f31082e-4096-47c7-b30c-83b129e630a3" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_327b5af0-7aa7-4611-b7cb-bfc2be28accd" xlink:to="loc_srt_RangeMember_2f31082e-4096-47c7-b30c-83b129e630a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_e8c4a82c-5f9a-41e8-bf04-888754fe32a4" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2f31082e-4096-47c7-b30c-83b129e630a3" xlink:to="loc_srt_MinimumMember_e8c4a82c-5f9a-41e8-bf04-888754fe32a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_06bb2267-d019-4972-8b8d-bdb45ff3916e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2f31082e-4096-47c7-b30c-83b129e630a3" xlink:to="loc_srt_MaximumMember_06bb2267-d019-4972-8b8d-bdb45ff3916e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_ecb5e6a3-a67d-441a-8376-ed21d5b505da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_64901e1d-216d-4b9c-ad36-0bd6869cae97" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_ecb5e6a3-a67d-441a-8376-ed21d5b505da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_ecb5e6a3-a67d-441a-8376-ed21d5b505da_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_ecb5e6a3-a67d-441a-8376-ed21d5b505da" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_ecb5e6a3-a67d-441a-8376-ed21d5b505da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_a72b52d4-58cb-47e6-b0ca-7bc6aedef09c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_ecb5e6a3-a67d-441a-8376-ed21d5b505da" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_a72b52d4-58cb-47e6-b0ca-7bc6aedef09c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_677dcb22-69c6-4752-a1cb-146420d25212" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_a72b52d4-58cb-47e6-b0ca-7bc6aedef09c" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_677dcb22-69c6-4752-a1cb-146420d25212" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01f9182c-9798-47e0-9cd8-64a05c92b8bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_64901e1d-216d-4b9c-ad36-0bd6869cae97" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01f9182c-9798-47e0-9cd8-64a05c92b8bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01f9182c-9798-47e0-9cd8-64a05c92b8bd_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01f9182c-9798-47e0-9cd8-64a05c92b8bd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01f9182c-9798-47e0-9cd8-64a05c92b8bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f48f178-1d6f-4ea8-98c5-4ebae0428cd6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01f9182c-9798-47e0-9cd8-64a05c92b8bd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f48f178-1d6f-4ea8-98c5-4ebae0428cd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_dd028951-a172-4a31-9367-5a0a251885aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f48f178-1d6f-4ea8-98c5-4ebae0428cd6" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_dd028951-a172-4a31-9367-5a0a251885aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_ad65e965-04dc-48cf-9c6d-4db3c37dad01" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6f48f178-1d6f-4ea8-98c5-4ebae0428cd6" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_ad65e965-04dc-48cf-9c6d-4db3c37dad01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_48650572-efb0-4de7-ac30-a6c36024c71e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_64901e1d-216d-4b9c-ad36-0bd6869cae97" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_48650572-efb0-4de7-ac30-a6c36024c71e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_48650572-efb0-4de7-ac30-a6c36024c71e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_48650572-efb0-4de7-ac30-a6c36024c71e" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_48650572-efb0-4de7-ac30-a6c36024c71e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_bdb87c08-4066-41c0-802f-96e421e03b8e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_48650572-efb0-4de7-ac30-a6c36024c71e" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_bdb87c08-4066-41c0-802f-96e421e03b8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputCostToSellMember_1c791209-5446-4ba4-96c9-3b4891b15e3e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MeasurementInputCostToSellMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_bdb87c08-4066-41c0-802f-96e421e03b8e" xlink:to="loc_us-gaap_MeasurementInputCostToSellMember_1c791209-5446-4ba4-96c9-3b4891b15e3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_ae44a714-b8b3-4a35-bcdb-d6e82e1a7111" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_64901e1d-216d-4b9c-ad36-0bd6869cae97" xlink:to="loc_us-gaap_ValuationTechniqueAxis_ae44a714-b8b3-4a35-bcdb-d6e82e1a7111" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_ae44a714-b8b3-4a35-bcdb-d6e82e1a7111_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_ae44a714-b8b3-4a35-bcdb-d6e82e1a7111" xlink:to="loc_us-gaap_ValuationTechniqueDomain_ae44a714-b8b3-4a35-bcdb-d6e82e1a7111_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_05e21c7e-e196-4e39-8276-69261a6658c7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_ae44a714-b8b3-4a35-bcdb-d6e82e1a7111" xlink:to="loc_us-gaap_ValuationTechniqueDomain_05e21c7e-e196-4e39-8276-69261a6658c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_371fd85c-438f-4de9-a0e2-7d5d549616f5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_05e21c7e-e196-4e39-8276-69261a6658c7" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_371fd85c-438f-4de9-a0e2-7d5d549616f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueConsensusPricingModelMember_3204e491-cacd-4038-b0dc-ae482319f0b6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationTechniqueConsensusPricingModelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_05e21c7e-e196-4e39-8276-69261a6658c7" xlink:to="loc_us-gaap_ValuationTechniqueConsensusPricingModelMember_3204e491-cacd-4038-b0dc-ae482319f0b6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/FairValueFinancialInstrumentsCarryingAmountFVandPlacementDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#FairValueFinancialInstrumentsCarryingAmountFVandPlacementDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/FairValueFinancialInstrumentsCarryingAmountFVandPlacementDetails" xlink:type="extended" id="ia2c6f76f53b043e3bde912f981108070_FairValueFinancialInstrumentsCarryingAmountFVandPlacementDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9cfe1ef1-3497-42f4-9d84-338d5bf1f01b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_8be1defd-3fb7-48cb-9c7e-4bf4c86d3603" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9cfe1ef1-3497-42f4-9d84-338d5bf1f01b" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_8be1defd-3fb7-48cb-9c7e-4bf4c86d3603" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndDueFromBanks_0e8e5fab-f754-4707-9da8-731e18b980ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndDueFromBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_8be1defd-3fb7-48cb-9c7e-4bf4c86d3603" xlink:to="loc_us-gaap_CashAndDueFromBanks_0e8e5fab-f754-4707-9da8-731e18b980ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositsInBanks_37a12044-8a05-4181-9184-45bd1ab115a6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestBearingDepositsInBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_8be1defd-3fb7-48cb-9c7e-4bf4c86d3603" xlink:to="loc_us-gaap_InterestBearingDepositsInBanks_37a12044-8a05-4181-9184-45bd1ab115a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsSold_2ce42a93-a0e3-4854-8deb-0c49f31c5d95" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FederalFundsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_8be1defd-3fb7-48cb-9c7e-4bf4c86d3603" xlink:to="loc_us-gaap_FederalFundsSold_2ce42a93-a0e3-4854-8deb-0c49f31c5d95" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_aabbf6da-8cae-4b28-8d07-84b3f0cce2cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_8be1defd-3fb7-48cb-9c7e-4bf4c86d3603" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_aabbf6da-8cae-4b28-8d07-84b3f0cce2cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedInvestmentsAtFairValue_07f32541-6dcc-4e35-84f3-9332f10c04f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedInvestmentsAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_8be1defd-3fb7-48cb-9c7e-4bf4c86d3603" xlink:to="loc_us-gaap_RestrictedInvestmentsAtFairValue_07f32541-6dcc-4e35-84f3-9332f10c04f8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_e910e170-9a7a-446f-9d1e-9485d1010c8c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9cfe1ef1-3497-42f4-9d84-338d5bf1f01b" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_e910e170-9a7a-446f-9d1e-9485d1010c8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_NoninterestBearingDepositLiabilitiesFairValueDisclosure_b563ca73-58c6-4ebd-a9f7-f6bf8079017c" xlink:href="cbnk-20210930.xsd#cbnk_NoninterestBearingDepositLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_e910e170-9a7a-446f-9d1e-9485d1010c8c" xlink:to="loc_cbnk_NoninterestBearingDepositLiabilitiesFairValueDisclosure_b563ca73-58c6-4ebd-a9f7-f6bf8079017c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_InterestBearingDepositLiabilitiesFairValueDisclosure_6397dd39-5fc2-4fb2-8c41-d3b3c50a92b4" xlink:href="cbnk-20210930.xsd#cbnk_InterestBearingDepositLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_e910e170-9a7a-446f-9d1e-9485d1010c8c" xlink:to="loc_cbnk_InterestBearingDepositLiabilitiesFairValueDisclosure_6397dd39-5fc2-4fb2-8c41-d3b3c50a92b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_LongTermFederalHomeLoanBankAdvancesAndOtherBorrowingsFairValueDisclosure_94117a1a-ade0-4e9b-b3d1-fc146cd61ee5" xlink:href="cbnk-20210930.xsd#cbnk_LongTermFederalHomeLoanBankAdvancesAndOtherBorrowingsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_e910e170-9a7a-446f-9d1e-9485d1010c8c" xlink:to="loc_cbnk_LongTermFederalHomeLoanBankAdvancesAndOtherBorrowingsFairValueDisclosure_94117a1a-ade0-4e9b-b3d1-fc146cd61ee5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_48c04589-9ad3-4b44-a4d6-e45301b7cfbb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9cfe1ef1-3497-42f4-9d84-338d5bf1f01b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_48c04589-9ad3-4b44-a4d6-e45301b7cfbb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_d28cfa53-e01e-49a1-a7c6-94d15847d06a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_48c04589-9ad3-4b44-a4d6-e45301b7cfbb" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_d28cfa53-e01e-49a1-a7c6-94d15847d06a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_d28cfa53-e01e-49a1-a7c6-94d15847d06a_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_d28cfa53-e01e-49a1-a7c6-94d15847d06a" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_d28cfa53-e01e-49a1-a7c6-94d15847d06a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_0acca798-5fe8-4691-a365-63aaf4feeb15" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_d28cfa53-e01e-49a1-a7c6-94d15847d06a" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_0acca798-5fe8-4691-a365-63aaf4feeb15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_508fb3c8-d65d-4bc6-be36-92c40e633cfa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_0acca798-5fe8-4691-a365-63aaf4feeb15" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_508fb3c8-d65d-4bc6-be36-92c40e633cfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_2fe35918-20c1-4524-b6d6-975abcbca8dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_0acca798-5fe8-4691-a365-63aaf4feeb15" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_2fe35918-20c1-4524-b6d6-975abcbca8dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_a601ffac-031c-46c0-935b-f8cc0e7c4025" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_0acca798-5fe8-4691-a365-63aaf4feeb15" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_a601ffac-031c-46c0-935b-f8cc0e7c4025" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_fbf2b57a-b848-4f5f-8311-11160df07b32" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_48c04589-9ad3-4b44-a4d6-e45301b7cfbb" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_fbf2b57a-b848-4f5f-8311-11160df07b32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fbf2b57a-b848-4f5f-8311-11160df07b32_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_fbf2b57a-b848-4f5f-8311-11160df07b32" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fbf2b57a-b848-4f5f-8311-11160df07b32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cfe4475b-7f1d-4b80-a0cb-72f0f46e579e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_fbf2b57a-b848-4f5f-8311-11160df07b32" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cfe4475b-7f1d-4b80-a0cb-72f0f46e579e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_945f44fa-a613-468a-9e91-07e1f4a01eac" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cfe4475b-7f1d-4b80-a0cb-72f0f46e579e" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_945f44fa-a613-468a-9e91-07e1f4a01eac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_afd4d9ab-162b-44ee-85ca-cab33bca3dda" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cfe4475b-7f1d-4b80-a0cb-72f0f46e579e" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_afd4d9ab-162b-44ee-85ca-cab33bca3dda" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://capitalbankmd.com/role/SegmentsDetails" xlink:type="simple" xlink:href="cbnk-20210930.xsd#SegmentsDetails"/>
  <link:definitionLink xlink:role="http://capitalbankmd.com/role/SegmentsDetails" xlink:type="extended" id="i3ca4e11aa969495a87fe68b73efaaa47_SegmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_2c935ea0-0ddc-4f4b-b9cd-4271f6828ce8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_NumberOfReportableSegments_2c935ea0-0ddc-4f4b-b9cd-4271f6828ce8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_bac5c2d5-bd23-4e15-929b-d75bdb8abdf8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_bac5c2d5-bd23-4e15-929b-d75bdb8abdf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_a04f0897-42c8-4cb6-b0e6-90e44aa27436" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_InterestExpense_a04f0897-42c8-4cb6-b0e6-90e44aa27436" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_e47a2fcd-c005-4938-ab94-20cafa687e97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_e47a2fcd-c005-4938-ab94-20cafa687e97" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_7f4fff3d-1095-4e1f-97bf-cee39d45964d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_7f4fff3d-1095-4e1f-97bf-cee39d45964d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_896851cf-1a69-4dc5-a5fb-8cd15daa0514" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_896851cf-1a69-4dc5-a5fb-8cd15daa0514" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_d4837c55-0862-4a1b-ba8e-42052cece1a6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_NoninterestIncome_d4837c55-0862-4a1b-ba8e-42052cece1a6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_736923c9-08f8-48b0-90b9-a65d9ab995ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_NoninterestExpense_736923c9-08f8-48b0-90b9-a65d9ab995ae" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_fba9adfa-ef44-4fa2-b117-c3fead6f0334" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_fba9adfa-ef44-4fa2-b117-c3fead6f0334" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_2c46ce1d-c2c0-4dd5-a773-515d368488fa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_Assets_2c46ce1d-c2c0-4dd5-a773-515d368488fa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_62f985a6-9145-4d80-9a50-b99b2433445a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c4db26e8-4982-46e6-bcf9-2a39d2ebf3c6" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_62f985a6-9145-4d80-9a50-b99b2433445a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_f866cdd8-6a5a-43bf-acb5-16244d84e65f" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_62f985a6-9145-4d80-9a50-b99b2433445a" xlink:to="loc_srt_ConsolidationItemsAxis_f866cdd8-6a5a-43bf-acb5-16244d84e65f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_f866cdd8-6a5a-43bf-acb5-16244d84e65f_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_f866cdd8-6a5a-43bf-acb5-16244d84e65f" xlink:to="loc_srt_ConsolidationItemsDomain_f866cdd8-6a5a-43bf-acb5-16244d84e65f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_e4e80cf6-7730-4191-82bc-4667f2068b2a" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_f866cdd8-6a5a-43bf-acb5-16244d84e65f" xlink:to="loc_srt_ConsolidationItemsDomain_e4e80cf6-7730-4191-82bc-4667f2068b2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_46ee0ca8-0ee3-4d82-93b5-db8b72520e38" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_e4e80cf6-7730-4191-82bc-4667f2068b2a" xlink:to="loc_us-gaap_OperatingSegmentsMember_46ee0ca8-0ee3-4d82-93b5-db8b72520e38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_631f035d-9396-42fd-a405-2adbae1b7758" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_e4e80cf6-7730-4191-82bc-4667f2068b2a" xlink:to="loc_us-gaap_IntersegmentEliminationMember_631f035d-9396-42fd-a405-2adbae1b7758" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_b4783e8e-948d-4ac7-8df2-8c4724334527" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_62f985a6-9145-4d80-9a50-b99b2433445a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_b4783e8e-948d-4ac7-8df2-8c4724334527" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b4783e8e-948d-4ac7-8df2-8c4724334527_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b4783e8e-948d-4ac7-8df2-8c4724334527" xlink:to="loc_us-gaap_SegmentDomain_b4783e8e-948d-4ac7-8df2-8c4724334527_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0931d2bd-7670-4aa1-9cda-313abf8014c7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b4783e8e-948d-4ac7-8df2-8c4724334527" xlink:to="loc_us-gaap_SegmentDomain_0931d2bd-7670-4aa1-9cda-313abf8014c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CommercialBankMember_15e6e196-2e0e-41f9-9e35-66aef8c75aef" xlink:href="cbnk-20210930.xsd#cbnk_CommercialBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0931d2bd-7670-4aa1-9cda-313abf8014c7" xlink:to="loc_cbnk_CommercialBankMember_15e6e196-2e0e-41f9-9e35-66aef8c75aef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_CapitalBankHomeLoansMember_009dd31c-e574-4212-bd4d-852da120aafe" xlink:href="cbnk-20210930.xsd#cbnk_CapitalBankHomeLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0931d2bd-7670-4aa1-9cda-313abf8014c7" xlink:to="loc_cbnk_CapitalBankHomeLoansMember_009dd31c-e574-4212-bd4d-852da120aafe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbnk_OpenSkyMember_e56be98f-c2cf-4df9-9df0-52c5857add05" xlink:href="cbnk-20210930.xsd#cbnk_OpenSkyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0931d2bd-7670-4aa1-9cda-313abf8014c7" xlink:to="loc_cbnk_OpenSkyMember_e56be98f-c2cf-4df9-9df0-52c5857add05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateMember_b20b903c-72c3-4739-b8a4-447e61ac97dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CorporateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0931d2bd-7670-4aa1-9cda-313abf8014c7" xlink:to="loc_us-gaap_CorporateMember_b20b903c-72c3-4739-b8a4-447e61ac97dc" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
