3.26.1 html 734 406 1 false 78 0 false 5 false false R1.htm 995200090 - Document - Document and Entity Information Sheet http://www.bankfirstnational.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 995200100 - Statement - Consolidated Balance Sheets Sheet http://www.bankfirstnational.com/role/StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 995200105 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.bankfirstnational.com/role/StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 995200200 - Statement - Consolidated Statements of Income Sheet http://www.bankfirstnational.com/role/StatementConsolidatedStatementsOfIncome Consolidated Statements of Income Statements 4 false false R5.htm 995200300 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.bankfirstnational.com/role/StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 995200400 - Statement - Consolidated Statement of Stockholders' Equity Sheet http://www.bankfirstnational.com/role/StatementConsolidatedStatementOfStockholdersEquity Consolidated Statement of Stockholders' Equity Statements 6 false false R7.htm 995200405 - Statement - Consolidated Statements of Stockholders' Equity (Parenthetical) Sheet http://www.bankfirstnational.com/role/StatementConsolidatedStatementsOfStockholdersEquityParenthetical Consolidated Statements of Stockholders' Equity (Parenthetical) Statements 7 false false R8.htm 995200500 - Statement - Consolidated Statements of Cash Flows Sheet http://www.bankfirstnational.com/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 995200505 - Statement - Consolidated Statements of Cash Flows (Parenthetical) Sheet http://www.bankfirstnational.com/role/StatementConsolidatedStatementsOfCashFlowsParenthetical Consolidated Statements of Cash Flows (Parenthetical) Statements 9 false false R10.htm 995210101 - Disclosure - BASIS OF PRESENTATION Sheet http://www.bankfirstnational.com/role/DisclosureBasisOfPresentation BASIS OF PRESENTATION Notes 10 false false R11.htm 995210201 - Disclosure - ACQUISITION Sheet http://www.bankfirstnational.com/role/DisclosureAcquisition ACQUISITION Notes 11 false false R12.htm 995210301 - Disclosure - EARNINGS PER SHARE Sheet http://www.bankfirstnational.com/role/DisclosureEarningsPerShare EARNINGS PER SHARE Notes 12 false false R13.htm 995210401 - Disclosure - SECURITIES Sheet http://www.bankfirstnational.com/role/DisclosureSecurities SECURITIES Notes 13 false false R14.htm 995210501 - Disclosure - LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY Sheet http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQuality LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY Notes 14 false false R15.htm 995210601 - Disclosure - MORTGAGE SERVICING RIGHTS Sheet http://www.bankfirstnational.com/role/DisclosureMortgageServicingRights MORTGAGE SERVICING RIGHTS Notes 15 false false R16.htm 995210701 - Disclosure - NOTES PAYABLE Notes http://www.bankfirstnational.com/role/DisclosureNotesPayable NOTES PAYABLE Notes 16 false false R17.htm 995210801 - Disclosure - SUBORDINATED NOTES AND JUNIOR SUBORDINATED DEBENTURES Notes http://www.bankfirstnational.com/role/DisclosureSubordinatedNotesAndJuniorSubordinatedDebentures SUBORDINATED NOTES AND JUNIOR SUBORDINATED DEBENTURES Notes 17 false false R18.htm 995210901 - Disclosure - REGULATORY MATTERS Sheet http://www.bankfirstnational.com/role/DisclosureRegulatoryMatters REGULATORY MATTERS Notes 18 false false R19.htm 995211001 - Disclosure - SEGMENT INFORMATION Sheet http://www.bankfirstnational.com/role/DisclosureSegmentInformation SEGMENT INFORMATION Notes 19 false false R20.htm 995211101 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.bankfirstnational.com/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 20 false false R21.htm 995211201 - Disclosure - FAIR VALUE MEASUREMENTS Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurements FAIR VALUE MEASUREMENTS Notes 21 false false R22.htm 995211301 - Disclosure - STOCK BASED COMPENSATION Sheet http://www.bankfirstnational.com/role/DisclosureStockBasedCompensation STOCK BASED COMPENSATION Notes 22 false false R23.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 23 false false R24.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 24 false false R25.htm 99920102 - Disclosure - BASIS OF PRESENTATION (Policies) Sheet http://www.bankfirstnational.com/role/DisclosureBasisOfPresentationPolicies BASIS OF PRESENTATION (Policies) Policies 25 false false R26.htm 99930203 - Disclosure - ACQUISITION (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureAcquisitionTables ACQUISITION (Tables) Tables http://www.bankfirstnational.com/role/DisclosureAcquisition 26 false false R27.htm 99930303 - Disclosure - EARNINGS PER SHARE (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureEarningsPerShareTables EARNINGS PER SHARE (Tables) Tables http://www.bankfirstnational.com/role/DisclosureEarningsPerShare 27 false false R28.htm 99930403 - Disclosure - SECURITIES (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureSecuritiesTables SECURITIES (Tables) Tables http://www.bankfirstnational.com/role/DisclosureSecurities 28 false false R29.htm 99930503 - Disclosure - LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQualityTables LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY (Tables) Tables http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQuality 29 false false R30.htm 99930603 - Disclosure - MORTGAGE SERVICING RIGHTS (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureMortgageServicingRightsTables MORTGAGE SERVICING RIGHTS (Tables) Tables http://www.bankfirstnational.com/role/DisclosureMortgageServicingRights 30 false false R31.htm 99930703 - Disclosure - NOTES PAYABLE (Tables) Notes http://www.bankfirstnational.com/role/DisclosureNotesPayableTables NOTES PAYABLE (Tables) Tables http://www.bankfirstnational.com/role/DisclosureNotesPayable 31 false false R32.htm 99930903 - Disclosure - REGULATORY MATTERS (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureRegulatoryMattersTables REGULATORY MATTERS (Tables) Tables http://www.bankfirstnational.com/role/DisclosureRegulatoryMatters 32 false false R33.htm 99931103 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureCommitmentsAndContingenciesTables COMMITMENTS AND CONTINGENCIES (Tables) Tables http://www.bankfirstnational.com/role/DisclosureCommitmentsAndContingencies 33 false false R34.htm 99931203 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsTables FAIR VALUE MEASUREMENTS (Tables) Tables http://www.bankfirstnational.com/role/DisclosureFairValueMeasurements 34 false false R35.htm 99931303 - Disclosure - STOCK BASED COMPENSATION (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureStockBasedCompensationTables STOCK BASED COMPENSATION (Tables) Tables http://www.bankfirstnational.com/role/DisclosureStockBasedCompensation 35 false false R36.htm 99940101 - Disclosure - BASIS OF PRESENTATION (Details) Sheet http://www.bankfirstnational.com/role/DisclosureBasisOfPresentationDetails BASIS OF PRESENTATION (Details) Details http://www.bankfirstnational.com/role/DisclosureBasisOfPresentationPolicies 36 false false R37.htm 99940201 - Disclosure - ACQUISITION - Centre (Details) Sheet http://www.bankfirstnational.com/role/DisclosureAcquisitionCentreDetails ACQUISITION - Centre (Details) Details 37 false false R38.htm 99940202 - Disclosure - ACQUISITION - Centre - Fair value of assets acquired and liabilities assumed (Details) Sheet http://www.bankfirstnational.com/role/DisclosureAcquisitionCentreFairValueOfAssetsAcquiredAndLiabilitiesAssumedDetails ACQUISITION - Centre - Fair value of assets acquired and liabilities assumed (Details) Details 38 false false R39.htm 99940203 - Disclosure - ACQUISITION - Centre - Loans purchased through acquisition (Details) Sheet http://www.bankfirstnational.com/role/DisclosureAcquisitionCentreLoansPurchasedThroughAcquisitionDetails ACQUISITION - Centre - Loans purchased through acquisition (Details) Details 39 false false R40.htm 99940204 - Disclosure - ACQUISITION - Centre - Pro Forma (Details) Sheet http://www.bankfirstnational.com/role/DisclosureAcquisitionCentreProFormaDetails ACQUISITION - Centre - Pro Forma (Details) Details 40 false false R41.htm 99940301 - Disclosure - EARNINGS PER SHARE (Details) Sheet http://www.bankfirstnational.com/role/DisclosureEarningsPerShareDetails EARNINGS PER SHARE (Details) Details http://www.bankfirstnational.com/role/DisclosureEarningsPerShareTables 41 false false R42.htm 99940401 - Disclosure - SECURITIES - Summary of securities (Details) Sheet http://www.bankfirstnational.com/role/DisclosureSecuritiesSummaryOfSecuritiesDetails SECURITIES - Summary of securities (Details) Details 42 false false R43.htm 99940402 - Disclosure - SECURITIES - Fair value and gross unrealized losses of securities with unrealized losses (Details) Sheet http://www.bankfirstnational.com/role/DisclosureSecuritiesFairValueAndGrossUnrealizedLossesOfSecuritiesWithUnrealizedLossesDetails SECURITIES - Fair value and gross unrealized losses of securities with unrealized losses (Details) Details 43 false false R44.htm 99940403 - Disclosure - SECURITIES - Amortized cost and estimated fair value of securities by contractual maturity (Details) Sheet http://www.bankfirstnational.com/role/DisclosureSecuritiesAmortizedCostAndEstimatedFairValueOfSecuritiesByContractualMaturityDetails SECURITIES - Amortized cost and estimated fair value of securities by contractual maturity (Details) Details 44 false false R45.htm 99940404 - Disclosure - SECURITIES - Sales of securities available for sate (Details) Sheet http://www.bankfirstnational.com/role/DisclosureSecuritiesSalesOfSecuritiesAvailableForSateDetails SECURITIES - Sales of securities available for sate (Details) Details 45 false false R46.htm 99940501 - Disclosure - LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Composition of loans (Details) Sheet http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQualityCompositionOfLoansDetails LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Composition of loans (Details) Details 46 false false R47.htm 99940502 - Disclosure - LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Activity in the ACL (Details) Sheet http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQualityActivityInAclDetails LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Activity in the ACL (Details) Details 47 false false R48.htm 99940503 - Disclosure - LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Provisions for credit losses (Details) Sheet http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQualityProvisionsForCreditLossesDetails LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Provisions for credit losses (Details) Details 48 false false R49.htm 99940504 - Disclosure - LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Past due and non-accrual loans (Details) Sheet http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQualityPastDueAndNonAccrualLoansDetails LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Past due and non-accrual loans (Details) Details 49 false false R50.htm 99940505 - Disclosure - LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Collateral dependent loans (Details) Sheet http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQualityCollateralDependentLoansDetails LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Collateral dependent loans (Details) Details 50 false false R51.htm 99940506 - Disclosure - LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Total loans by risk ratings and year of origination (Details) Sheet http://www.bankfirstnational.com/role/DisclosureLoansAllowanceForCreditLossesAndCreditQualityTotalLoansByRiskRatingsAndYearOfOriginationDetails LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Total loans by risk ratings and year of origination (Details) Details 51 false false R52.htm 99940601 - Disclosure - MORTGAGE SERVICING RIGHTS (Details) Sheet http://www.bankfirstnational.com/role/DisclosureMortgageServicingRightsDetails MORTGAGE SERVICING RIGHTS (Details) Details http://www.bankfirstnational.com/role/DisclosureMortgageServicingRightsTables 52 false false R53.htm 99940701 - Disclosure - NOTES PAYABLE - FHLB advances (Details) Notes http://www.bankfirstnational.com/role/DisclosureNotesPayableFhlbAdvancesDetails NOTES PAYABLE - FHLB advances (Details) Details 53 false false R54.htm 99940702 - Disclosure - NOTES PAYABLE - Future maturities (Details) Notes http://www.bankfirstnational.com/role/DisclosureNotesPayableFutureMaturitiesDetails NOTES PAYABLE - Future maturities (Details) Details 54 false false R55.htm 99940703 - Disclosure - NOTES PAYABLE - Additional Information (Details) Notes http://www.bankfirstnational.com/role/DisclosureNotesPayableAdditionalInformationDetails NOTES PAYABLE - Additional Information (Details) Details 55 false false R56.htm 99940801 - Disclosure - SUBORDINATED NOTES AND JUNIOR SUBORDINATED DEBENTURES (Details) Notes http://www.bankfirstnational.com/role/DisclosureSubordinatedNotesAndJuniorSubordinatedDebenturesDetails SUBORDINATED NOTES AND JUNIOR SUBORDINATED DEBENTURES (Details) Details http://www.bankfirstnational.com/role/DisclosureSubordinatedNotesAndJuniorSubordinatedDebentures 56 false false R57.htm 99940901 - Disclosure - REGULATORY MATTERS (Details) Sheet http://www.bankfirstnational.com/role/DisclosureRegulatoryMattersDetails REGULATORY MATTERS (Details) Details http://www.bankfirstnational.com/role/DisclosureRegulatoryMattersTables 57 false false R58.htm 99941001 - Disclosure - SEGMENT INFORMATION (Details) Sheet http://www.bankfirstnational.com/role/DisclosureSegmentInformationDetails SEGMENT INFORMATION (Details) Details http://www.bankfirstnational.com/role/DisclosureSegmentInformation 58 false false R59.htm 99941101 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.bankfirstnational.com/role/DisclosureCommitmentsAndContingenciesDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://www.bankfirstnational.com/role/DisclosureCommitmentsAndContingenciesTables 59 false false R60.htm 99941201 - Disclosure - FAIR VALUE MEASUREMENTS - Fair value of assets measured on a recurring basis (Details) Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsFairValueOfAssetsMeasuredOnRecurringBasisDetails FAIR VALUE MEASUREMENTS - Fair value of assets measured on a recurring basis (Details) Details 60 false false R61.htm 99941202 - Disclosure - FAIR VALUE MEASUREMENTS - Fair value of assets measured on a non-recurring basis (Details) Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsFairValueOfAssetsMeasuredOnNonRecurringBasisDetails FAIR VALUE MEASUREMENTS - Fair value of assets measured on a non-recurring basis (Details) Details 61 false false R62.htm 99941203 - Disclosure - FAIR VALUE MEASUREMENTS - Fair value measurement on inputs and valuation techniques (Details) Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsFairValueMeasurementOnInputsAndValuationTechniquesDetails FAIR VALUE MEASUREMENTS - Fair value measurement on inputs and valuation techniques (Details) Details 62 false false R63.htm 99941204 - Disclosure - FAIR VALUE MEASUREMENTS - Carrying value and estimated fair value (Details) Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsCarryingValueAndEstimatedFairValueDetails FAIR VALUE MEASUREMENTS - Carrying value and estimated fair value (Details) Details 63 false false R64.htm 99941301 - Disclosure - STOCK BASED COMPENSATION - Summary of Plans (Details) Sheet http://www.bankfirstnational.com/role/DisclosureStockBasedCompensationSummaryOfPlansDetails STOCK BASED COMPENSATION - Summary of Plans (Details) Details 64 false false R65.htm 99941302 - Disclosure - STOCK BASED COMPENSATION - Changes in Restricted Stock (Details) Sheet http://www.bankfirstnational.com/role/DisclosureStockBasedCompensationChangesInRestrictedStockDetails STOCK BASED COMPENSATION - Changes in Restricted Stock (Details) Details 65 false false All Reports Book All Reports bfc-20260331.xsd bfc-20260331_cal.xml bfc-20260331_def.xml bfc-20260331_lab.xml bfc-20260331_pre.xml bfc-20260331x10q.htm http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true