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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fecea-2198-797a-9b09-3127d7012702,g:acabf384-435d-4cfa-b002-80b86e86009f-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:bfst="http://www.b1bank.com/20260930" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.b1bank.com/20260930">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="bfst-20260930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="bfst-20260930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="bfst-20260930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="bfst-20260930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.b1bank.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETS" roleURI="http://www.b1bank.com/role/CONSOLIDATEDBALANCESHEETS">
        <link:definition>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETSParenthetical" roleURI="http://www.b1bank.com/role/CONSOLIDATEDBALANCESHEETSParenthetical">
        <link:definition>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UNAUDITEDCONSOLIDATEDSTATEMENTSOFINCOME" roleURI="http://www.b1bank.com/role/UNAUDITEDCONSOLIDATEDSTATEMENTSOFINCOME">
        <link:definition>9952153 - Statement - UNAUDITED CONSOLIDATED STATEMENTS OF INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UNAUDITEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS" roleURI="http://www.b1bank.com/role/UNAUDITEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS">
        <link:definition>9952154 - Statement - UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UNAUDITEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY" roleURI="http://www.b1bank.com/role/UNAUDITEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY">
        <link:definition>9952155 - Statement - UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UNAUDITEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITYParentheticals" roleURI="http://www.b1bank.com/role/UNAUDITEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITYParentheticals">
        <link:definition>9952156 - Statement - UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parentheticals)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="UNAUDITEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" roleURI="http://www.b1bank.com/role/UNAUDITEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>9952157 - Statement - UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentation" roleURI="http://www.b1bank.com/role/BasisofPresentation">
        <link:definition>9952158 - Disclosure - Basis of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="MergersandAcquisitions" roleURI="http://www.b1bank.com/role/MergersandAcquisitions">
        <link:definition>9952159 - Disclosure - Mergers and Acquisitions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsperCommonShare" roleURI="http://www.b1bank.com/role/EarningsperCommonShare">
        <link:definition>9952160 - Disclosure - Earnings per Common Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Securities" roleURI="http://www.b1bank.com/role/Securities">
        <link:definition>9952161 - Disclosure - Securities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLosses" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLosses">
        <link:definition>9952162 - Disclosure - Loans and the Allowance for Credit Losses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Borrowings" roleURI="http://www.b1bank.com/role/Borrowings">
        <link:definition>9952163 - Disclosure - Borrowings</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherIncomeandOtherExpense" roleURI="http://www.b1bank.com/role/OtherIncomeandOtherExpense">
        <link:definition>9952164 - Disclosure - Other Income and Other Expense</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.b1bank.com/role/Leases">
        <link:definition>9952165 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.b1bank.com/role/CommitmentsandContingencies">
        <link:definition>9952166 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CustomerInitiatedDerivatives" roleURI="http://www.b1bank.com/role/CustomerInitiatedDerivatives">
        <link:definition>9952167 - Disclosure - Customer-Initiated Derivatives</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstruments" roleURI="http://www.b1bank.com/role/FairValueofFinancialInstruments">
        <link:definition>9952168 - Disclosure - Fair Value of Financial Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationPolicies" roleURI="http://www.b1bank.com/role/BasisofPresentationPolicies">
        <link:definition>9955511 - Disclosure - Basis of Presentation (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="MergersandAcquisitionsTables" roleURI="http://www.b1bank.com/role/MergersandAcquisitionsTables">
        <link:definition>9955512 - Disclosure - Mergers and Acquisitions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsperCommonShareTables" roleURI="http://www.b1bank.com/role/EarningsperCommonShareTables">
        <link:definition>9955513 - Disclosure - Earnings per Common Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SecuritiesTables" roleURI="http://www.b1bank.com/role/SecuritiesTables">
        <link:definition>9955514 - Disclosure - Securities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLossesTables" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLossesTables">
        <link:definition>9955515 - Disclosure - Loans and the Allowance for Credit Losses (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsTables" roleURI="http://www.b1bank.com/role/BorrowingsTables">
        <link:definition>9955516 - Disclosure - Borrowings (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherIncomeandOtherExpenseTables" roleURI="http://www.b1bank.com/role/OtherIncomeandOtherExpenseTables">
        <link:definition>9955517 - Disclosure - Other Income and Other Expense (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.b1bank.com/role/LeasesTables">
        <link:definition>9955518 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CustomerInitiatedDerivativesTables" roleURI="http://www.b1bank.com/role/CustomerInitiatedDerivativesTables">
        <link:definition>9955519 - Disclosure - Customer-Initiated Derivatives (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstrumentsTables" roleURI="http://www.b1bank.com/role/FairValueofFinancialInstrumentsTables">
        <link:definition>9955520 - Disclosure - Fair Value of Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationDetails" roleURI="http://www.b1bank.com/role/BasisofPresentationDetails">
        <link:definition>9955521 - Disclosure - Basis of Presentation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="MergersandAcquisitionsNarrativeDetails" roleURI="http://www.b1bank.com/role/MergersandAcquisitionsNarrativeDetails">
        <link:definition>9955522 - Disclosure - Mergers and Acquisitions - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="MergersandAcquisitionsScheduleofIdentifiableAssetsPurchasedandLiabilitiesAssumedDetails" roleURI="http://www.b1bank.com/role/MergersandAcquisitionsScheduleofIdentifiableAssetsPurchasedandLiabilitiesAssumedDetails">
        <link:definition>9955523 - Disclosure - Mergers and Acquisitions - Schedule of Identifiable Assets Purchased and Liabilities Assumed (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsperCommonShareDetails" roleURI="http://www.b1bank.com/role/EarningsperCommonShareDetails">
        <link:definition>9955524 - Disclosure - Earnings per Common Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SecuritiesSecuritiesAvailableforsaleDetails" roleURI="http://www.b1bank.com/role/SecuritiesSecuritiesAvailableforsaleDetails">
        <link:definition>9955525 - Disclosure - Securities - Securities Available-for-sale (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SecuritiesSecuritiesinaContinuousUnrealizedLossPositionDetails" roleURI="http://www.b1bank.com/role/SecuritiesSecuritiesinaContinuousUnrealizedLossPositionDetails">
        <link:definition>9955526 - Disclosure - Securities - Securities in a Continuous Unrealized Loss Position (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SecuritiesSecuritiesAvailableforsalebyContractualMaturityDetails" roleURI="http://www.b1bank.com/role/SecuritiesSecuritiesAvailableforsalebyContractualMaturityDetails">
        <link:definition>9955527 - Disclosure - Securities - Securities Available-for-sale by Contractual Maturity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SecuritiesNarrativeDetails" roleURI="http://www.b1bank.com/role/SecuritiesNarrativeDetails">
        <link:definition>9955528 - Disclosure - Securities - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLossesLoansReceivableDetails" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLossesLoansReceivableDetails">
        <link:definition>9955529 - Disclosure - Loans and the Allowance for Credit Losses - Loans Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLossesNarrativeDetails" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLossesNarrativeDetails">
        <link:definition>9955530 - Disclosure - Loans and the Allowance for Credit Losses - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLossesAllowanceforCreditLossesandRecordedInvestmentinLoansReceivableDetails" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLossesAllowanceforCreditLossesandRecordedInvestmentinLoansReceivableDetails">
        <link:definition>9955531 - Disclosure - Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investment in Loans Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLossesIndividuallyEvaluatedLoansandAllowanceDetails" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLossesIndividuallyEvaluatedLoansandAllowanceDetails">
        <link:definition>9955532 - Disclosure - Loans and the Allowance for Credit Losses - Individually Evaluated Loans and Allowance (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLossesCreditQualityIndicatorsDetails" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLossesCreditQualityIndicatorsDetails">
        <link:definition>9955533 - Disclosure - Loans and the Allowance for Credit Losses - Credit Quality Indicators (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLossesPastDueLoansReceivableDetails" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLossesPastDueLoansReceivableDetails">
        <link:definition>9955534 - Disclosure - Loans and the Allowance for Credit Losses - Past Due Loans Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LoansandtheAllowanceforCreditLossesLoanReceivablesonNonaccrualStatusDetails" roleURI="http://www.b1bank.com/role/LoansandtheAllowanceforCreditLossesLoanReceivablesonNonaccrualStatusDetails">
        <link:definition>9955535 - Disclosure - Loans and the Allowance for Credit Losses - Loan Receivables on Nonaccrual Status (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsScheduleofOutstandingAdvancesDetails" roleURI="http://www.b1bank.com/role/BorrowingsScheduleofOutstandingAdvancesDetails">
        <link:definition>9955536 - Disclosure - Borrowings - Schedule of Outstanding Advances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsNarrativeDetails" roleURI="http://www.b1bank.com/role/BorrowingsNarrativeDetails">
        <link:definition>9955537 - Disclosure - Borrowings - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherIncomeandOtherExpenseScheduleofOtherIncomeDetails" roleURI="http://www.b1bank.com/role/OtherIncomeandOtherExpenseScheduleofOtherIncomeDetails">
        <link:definition>9955538 - Disclosure - Other Income and Other Expense - Schedule of Other Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherIncomeandOtherExpenseScheduleofOtherExpensesDetails" roleURI="http://www.b1bank.com/role/OtherIncomeandOtherExpenseScheduleofOtherExpensesDetails">
        <link:definition>9955539 - Disclosure - Other Income and Other Expense - Schedule of Other Expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesNarrativeDetails" roleURI="http://www.b1bank.com/role/LeasesNarrativeDetails">
        <link:definition>9955540 - Disclosure - Leases - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesFutureMinimumLeasePaymentsDetails" roleURI="http://www.b1bank.com/role/LeasesFutureMinimumLeasePaymentsDetails">
        <link:definition>9955541 - Disclosure - Leases - Future Minimum Lease Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesFutureMinimumLeasePaymentsDetails_1" roleURI="http://www.b1bank.com/role/LeasesFutureMinimumLeasePaymentsDetails_1">
        <link:definition>9955541 - Disclosure - Leases - Future Minimum Lease Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesDetails" roleURI="http://www.b1bank.com/role/CommitmentsandContingenciesDetails">
        <link:definition>9955542 - Disclosure - Commitments and Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CustomerInitiatedDerivativesNarrativeDetails" roleURI="http://www.b1bank.com/role/CustomerInitiatedDerivativesNarrativeDetails">
        <link:definition>9955543 - Disclosure - Customer-Initiated Derivatives - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CustomerInitiatedDerivativesScheduleofDerivativeInstrumentsDetails" roleURI="http://www.b1bank.com/role/CustomerInitiatedDerivativesScheduleofDerivativeInstrumentsDetails">
        <link:definition>9955544 - Disclosure - Customer-Initiated Derivatives- Schedule of Derivative Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstrumentsAssetsandLiabilitiesMeasuredonRecurringBasisDetails" roleURI="http://www.b1bank.com/role/FairValueofFinancialInstrumentsAssetsandLiabilitiesMeasuredonRecurringBasisDetails">
        <link:definition>9955545 - Disclosure - Fair Value of Financial Instruments - Assets and Liabilities Measured on Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstrumentsReconciliationOfAssetsMeasuredatFairValueOnARecurringBasisDetails" roleURI="http://www.b1bank.com/role/FairValueofFinancialInstrumentsReconciliationOfAssetsMeasuredatFairValueOnARecurringBasisDetails">
        <link:definition>9955546 - Disclosure - Fair Value of Financial Instruments - Reconciliation Of Assets Measured at Fair Value On A Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstrumentsScheduleofFairValueMeasurementInputsDetails" roleURI="http://www.b1bank.com/role/FairValueofFinancialInstrumentsScheduleofFairValueMeasurementInputsDetails">
        <link:definition>9955547 - Disclosure - Fair Value of Financial Instruments - Schedule of Fair Value Measurement Inputs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstrumentsNarrativeDetails" roleURI="http://www.b1bank.com/role/FairValueofFinancialInstrumentsNarrativeDetails">
        <link:definition>9955548 - Disclosure - Fair Value of Financial Instruments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstrumentsAssetsMeasuredonaNonrecurringBasisDetails" roleURI="http://www.b1bank.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonaNonrecurringBasisDetails">
        <link:definition>9955549 - Disclosure - Fair Value of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstrumentsEstimatedFairValuesofFinancialInstrumentsDetails" roleURI="http://www.b1bank.com/role/FairValueofFinancialInstrumentsEstimatedFairValuesofFinancialInstrumentsDetails">
        <link:definition>9955550 - Disclosure - Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="bfst_OtherEquitySecuritiesFairValueDisclosure" abstract="false" name="OtherEquitySecuritiesFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_TrustPreferredSecurities" abstract="false" name="TrustPreferredSecurities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_InterestAndDividendIncomeOnNonTaxableSecuritiesOperating" abstract="false" name="InterestAndDividendIncomeOnNonTaxableSecuritiesOperating" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_InterestAndDividendIncomeTaxableSecuritiesOperating" abstract="false" name="InterestAndDividendIncomeTaxableSecuritiesOperating" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_InterestOnFederalFundsSoldAndDueFromBanks" abstract="false" name="InterestOnFederalFundsSoldAndDueFromBanks" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_BusinessAcquisitionAmortizationAccretionFairMarketValueAdjustments" abstract="false" name="BusinessAcquisitionAmortizationAccretionFairMarketValueAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_ProceedsFromRepaymentsOfInvestmentSecuritiesAvailableForSale" abstract="false" name="ProceedsFromRepaymentsOfInvestmentSecuritiesAvailableForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_NetCashReceivedInAcquisition" abstract="false" name="NetCashReceivedInAcquisition" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_PaymentsToSellBranchNet" abstract="false" name="PaymentsToSellBranchNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_RedemptionOfOtherEquitySecurities" abstract="false" name="RedemptionOfOtherEquitySecurities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_NetAdvancesRepaymentsOnShortTermFederalHomeLoanBankBorrowings" abstract="false" name="NetAdvancesRepaymentsOnShortTermFederalHomeLoanBankBorrowings" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_InterestOnDeposits" abstract="false" name="InterestOnDeposits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_InterestPaidOnBorrowingsNet" abstract="false" name="InterestPaidOnBorrowingsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_NoncashOrPartNoncashAcquisitionAssetsAcquiredAndLiabilitiesAssumed" abstract="false" name="NoncashOrPartNoncashAcquisitionAssetsAcquiredAndLiabilitiesAssumed" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_ScheduleOfFinancingReceivableAndAllowancesIndividuallyEvaluatedTableTextBlock" abstract="false" name="ScheduleOfFinancingReceivableAndAllowancesIndividuallyEvaluatedTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="bfst_OtherIncomeTableTextBlock" abstract="false" name="OtherIncomeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="bfst_NumberOfWhollyOwnedSubsidiaries" abstract="false" name="NumberOfWhollyOwnedSubsidiaries" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="bfst_ProgressiveBancorpIncMember" abstract="true" name="ProgressiveBancorpIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_AmericanPlanningCorporationMember" abstract="true" name="AmericanPlanningCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_BusinessCombinationConsiderationTransferredPartialSharesPaidInCash" abstract="false" name="BusinessCombinationConsiderationTransferredPartialSharesPaidInCash" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLifeInsurance" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLifeInsurance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_PublicDepositAndRepurchaseAgreementsMember" abstract="true" name="PublicDepositAndRepurchaseAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_CommercialMember" abstract="true" name="CommercialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_ResidentialMember" abstract="true" name="ResidentialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_ProgressiveMember" abstract="true" name="ProgressiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_LoansAndLeasesReceivableReclassifiedFromOverdraft" abstract="false" name="LoansAndLeasesReceivableReclassifiedFromOverdraft" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_FinancingReceivableAccruedInterestReceivableLoansDeferrals" abstract="false" name="FinancingReceivableAccruedInterestReceivableLoansDeferrals" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetAndUnfundedLoanCommitments" abstract="false" name="FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetAndUnfundedLoanCommitments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_RealEstatePortfolioSegmentMember" abstract="true" name="RealEstatePortfolioSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_ConstructionAndLandMember" abstract="true" name="ConstructionAndLandMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_FinancingReceivablesAllowanceForCreditLossesIndividuallyEvaluatedForImpairment" abstract="false" name="FinancingReceivablesAllowanceForCreditLossesIndividuallyEvaluatedForImpairment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_LossMember" abstract="true" name="LossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_CommercialRealEstatePortfolioSegmentNetOfAdjustmentsMember" abstract="true" name="CommercialRealEstatePortfolioSegmentNetOfAdjustmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_CommercialPortfolioSegmentNetOfAdjustmentsMember" abstract="true" name="CommercialPortfolioSegmentNetOfAdjustmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.65AdvanceDueJanuary2026Member" abstract="true" name="A4.65AdvanceDueJanuary2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A3.62AdvanceDueJanuary2026Member" abstract="true" name="A3.62AdvanceDueJanuary2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.00AdvanceDueMarch2026Member" abstract="true" name="A4.00AdvanceDueMarch2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.56AdvanceDueJuly2026Member" abstract="true" name="A4.56AdvanceDueJuly2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A3.91AdvanceDueJuly2026Member" abstract="true" name="A3.91AdvanceDueJuly2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.05AdvanceDueOctober2026Member" abstract="true" name="A4.05AdvanceDueOctober2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.11AdvanceDueOctober2026Member" abstract="true" name="A4.11AdvanceDueOctober2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.12AdvanceDueOctober2026Member" abstract="true" name="A4.12AdvanceDueOctober2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.14AdvanceDueOctober2026Member" abstract="true" name="A4.14AdvanceDueOctober2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A0.89AdvanceDueNovember2026Member" abstract="true" name="A0.89AdvanceDueNovember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.84AdvanceDueDecember2026Member" abstract="true" name="A4.84AdvanceDueDecember2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A0.71AdvanceDueAugust2027Member" abstract="true" name="A0.71AdvanceDueAugust2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A0.70AdvanceDueAugust2027Member" abstract="true" name="A0.70AdvanceDueAugust2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A0.68AdvanceDueAugust2027Member" abstract="true" name="A0.68AdvanceDueAugust2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.78AdvanceDueSeptember2027Member" abstract="true" name="A4.78AdvanceDueSeptember2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.73AdvanceDueMarch2028Member" abstract="true" name="A4.73AdvanceDueMarch2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.69AdvanceDueSeptember2028Member" abstract="true" name="A4.69AdvanceDueSeptember2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A4.13AdvanceDueOctober2028Member" abstract="true" name="A4.13AdvanceDueOctober2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A0.94AdvanceDueAugust2030Member" abstract="true" name="A0.94AdvanceDueAugust2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A0.92AdvanceDueAugust2030Member" abstract="true" name="A0.92AdvanceDueAugust2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A0.90AdvanceDueAugust2030Member" abstract="true" name="A0.90AdvanceDueAugust2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A3.92AdvanceDueOctober2030Member" abstract="true" name="A3.92AdvanceDueOctober2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A3.72AdvanceDueOctober2033Member" abstract="true" name="A3.72AdvanceDueOctober2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_A3.57AdvanceDueOctober2033Member" abstract="true" name="A3.57AdvanceDueOctober2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_AdvancesFromFederalHomeLoanBanksNetOfUnaccretedMarketValueAdjustment" abstract="false" name="AdvancesFromFederalHomeLoanBanksNetOfUnaccretedMarketValueAdjustment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_ProgressiveTrustPreferredSecurityIMember" abstract="true" name="ProgressiveTrustPreferredSecurityIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_ProgressiveTrustPreferredSecurityIIMember" abstract="true" name="ProgressiveTrustPreferredSecurityIIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_TrustPreferredSecuritiesMember" abstract="true" name="TrustPreferredSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_DebtInstrumentBasisSpreadOnVariableRatePayableQuarterly" abstract="false" name="DebtInstrumentBasisSpreadOnVariableRatePayableQuarterly" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="bfst_DebtInstrumentDeferredInterestPaymentsConsecutivePeriodsWithoutDefaultMaximum" abstract="false" name="DebtInstrumentDeferredInterestPaymentsConsecutivePeriodsWithoutDefaultMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="bfst_FeeIncomeFromDebitCardAndAtm" abstract="false" name="FeeIncomeFromDebitCardAndAtm" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_PassThroughIncomeLossFromSBICAndFintechPartnerships" abstract="false" name="PassThroughIncomeLossFromSBICAndFintechPartnerships" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_AdValoremSharesTax" abstract="false" name="AdValoremSharesTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_BankRegulatoryExpenses" abstract="false" name="BankRegulatoryExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_LesseeOperatingLeaseLiabilityToBePaidYearFiveAndThereafter" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidYearFiveAndThereafter" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_DerivativeInstrumentSwapFeeIncome" abstract="false" name="DerivativeInstrumentSwapFeeIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="bfst_InterestRateCapsAndFloorsWrittenMember" abstract="true" name="InterestRateCapsAndFloorsWrittenMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_InterestRateCapsAndFloorsPurchasedMember" abstract="true" name="InterestRateCapsAndFloorsPurchasedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_CustomerInitiatedAndOtherActivitiesMember" abstract="true" name="CustomerInitiatedAndOtherActivitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_MeasurementInputLiquidityPremiumMember" abstract="true" name="MeasurementInputLiquidityPremiumMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_IndividuallyEvaluatedLoansMember" abstract="true" name="IndividuallyEvaluatedLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_OtherNonperformingAssetsMember" abstract="true" name="OtherNonperformingAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="bfst_CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure" abstract="false" name="CashCashEquivalentsAndShortTermInvestmentsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
