3.26.1 html 100 77 1 false 14 0 false 4 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.bankfirstnational.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS Sheet http://www.bankfirstnational.com/role/StatementStatementsOfNetAssetsAvailableForBenefits STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS Statements 2 false false R3.htm 00200 - Statement - STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS Sheet http://www.bankfirstnational.com/role/StatementStatementOfChangesInNetAssetsAvailableForBenefits STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS Statements 3 false false R4.htm 10101 - Disclosure - Description of Plan Sheet http://www.bankfirstnational.com/role/DisclosureDescriptionOfPlan Description of Plan Notes 4 false false R5.htm 10201 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.bankfirstnational.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 5 false false R6.htm 10301 - Disclosure - Concentrations Sheet http://www.bankfirstnational.com/role/DisclosureConcentrations Concentrations Notes 6 false false R7.htm 10401 - Disclosure - Fair Value Measurements Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 7 false false R8.htm 10501 - Disclosure - Tax Status Sheet http://www.bankfirstnational.com/role/DisclosureTaxStatus Tax Status Notes 8 false false R9.htm 10601 - Disclosure - Transactions with Related Parties and Parties-in-Interest Sheet http://www.bankfirstnational.com/role/DisclosureTransactionsWithRelatedPartiesAndPartiesInInterest Transactions with Related Parties and Parties-in-Interest Notes 9 false false R10.htm 10701 - Disclosure - Amounts Owed to Participants Withdrawing from the Plan Sheet http://www.bankfirstnational.com/role/DisclosureAmountsOwedToParticipantsWithdrawingFromPlan Amounts Owed to Participants Withdrawing from the Plan Notes 10 false false R11.htm 10801 - Disclosure - Reconciliation of Financial Statements to Form 5500 Sheet http://www.bankfirstnational.com/role/DisclosureReconciliationOfFinancialStatementsToForm5500 Reconciliation of Financial Statements to Form 5500 Notes 11 false false R12.htm 10901 - Disclosure - SCHEDULE OF ASSETS Sheet http://www.bankfirstnational.com/role/DisclosureScheduleOfAssets SCHEDULE OF ASSETS Notes 12 false false R13.htm 20202 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.bankfirstnational.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.bankfirstnational.com/role/DisclosureSummaryOfSignificantAccountingPolicies 13 false false R14.htm 30303 - Disclosure - Concentrations (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureConcentrationsTables Concentrations (Tables) Tables http://www.bankfirstnational.com/role/DisclosureConcentrations 14 false false R15.htm 30403 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.bankfirstnational.com/role/DisclosureFairValueMeasurements 15 false false R16.htm 30603 - Disclosure - Transactions with Related Parties and Parties-in-Interest (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureTransactionsWithRelatedPartiesAndPartiesInInterestTables Transactions with Related Parties and Parties-in-Interest (Tables) Tables http://www.bankfirstnational.com/role/DisclosureTransactionsWithRelatedPartiesAndPartiesInInterest 16 false false R17.htm 30803 - Disclosure - Reconciliation of Financial Statements to Form 5500 (Tables) Sheet http://www.bankfirstnational.com/role/DisclosureReconciliationOfFinancialStatementsToForm5500Tables Reconciliation of Financial Statements to Form 5500 (Tables) Tables http://www.bankfirstnational.com/role/DisclosureReconciliationOfFinancialStatementsToForm5500 17 false false R18.htm 40101 - Disclosure - Description of Plan - General (Details) Sheet http://www.bankfirstnational.com/role/DisclosureDescriptionOfPlanGeneralDetails Description of Plan - General (Details) Details 18 false false R19.htm 40102 - Disclosure - Description of Plan - Contributions (Details) Sheet http://www.bankfirstnational.com/role/DisclosureDescriptionOfPlanContributionsDetails Description of Plan - Contributions (Details) Details 19 false false R20.htm 40103 - Disclosure - Description of Plan - Vesting (Details) Sheet http://www.bankfirstnational.com/role/DisclosureDescriptionOfPlanVestingDetails Description of Plan - Vesting (Details) Details 20 false false R21.htm 40104 - Disclosure - Description of Plan (Details) Sheet http://www.bankfirstnational.com/role/DisclosureDescriptionOfPlanDetails Description of Plan (Details) Details http://www.bankfirstnational.com/role/DisclosureDescriptionOfPlan 21 false false R22.htm 40301 - Disclosure - Concentrations (Details) Sheet http://www.bankfirstnational.com/role/DisclosureConcentrationsDetails Concentrations (Details) Details http://www.bankfirstnational.com/role/DisclosureConcentrationsTables 22 false false R23.htm 40401 - Disclosure - Fair Value Measurements (Details) Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsDetails Fair Value Measurements (Details) Details http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsTables 23 false false R24.htm 40402 - Disclosure - Fair Value Measurements - NAV (Details) Sheet http://www.bankfirstnational.com/role/DisclosureFairValueMeasurementsNavDetails Fair Value Measurements - NAV (Details) Details 24 false false R25.htm 40501 - Disclosure - Tax Status (Details) Sheet http://www.bankfirstnational.com/role/DisclosureTaxStatusDetails Tax Status (Details) Details http://www.bankfirstnational.com/role/DisclosureTaxStatus 25 false false R26.htm 40601 - Disclosure - Transactions with Related Parties and Parties-in-Interest (Details) Sheet http://www.bankfirstnational.com/role/DisclosureTransactionsWithRelatedPartiesAndPartiesInInterestDetails Transactions with Related Parties and Parties-in-Interest (Details) Details http://www.bankfirstnational.com/role/DisclosureTransactionsWithRelatedPartiesAndPartiesInInterestTables 26 false false R27.htm 40701 - Disclosure - Amounts Owed to Participants Withdrawing from the Plan (Details) Sheet http://www.bankfirstnational.com/role/DisclosureAmountsOwedToParticipantsWithdrawingFromPlanDetails Amounts Owed to Participants Withdrawing from the Plan (Details) Details http://www.bankfirstnational.com/role/DisclosureAmountsOwedToParticipantsWithdrawingFromPlan 27 false false R28.htm 40801 - Disclosure - Reconciliation of Financial Statements to Form 5500 (Details) Sheet http://www.bankfirstnational.com/role/DisclosureReconciliationOfFinancialStatementsToForm5500Details Reconciliation of Financial Statements to Form 5500 (Details) Details http://www.bankfirstnational.com/role/DisclosureReconciliationOfFinancialStatementsToForm5500Tables 28 false false R29.htm 40901 - Disclosure - SCHEDULE OF ASSETS (Details) Sheet http://www.bankfirstnational.com/role/DisclosureScheduleOfAssetsDetails SCHEDULE OF ASSETS (Details) Details http://www.bankfirstnational.com/role/DisclosureScheduleOfAssets 29 false false All Reports Book All Reports bfc-20251231.xsd bfc-20251231_cal.xml bfc-20251231_def.xml bfc-20251231_lab.xml bfc-20251231_pre.xml bfc-20251231x11k.htm bfc-20251231x11k001.jpg bfc-20251231x11k002.jpg http://fasb.org/us-gaap-ebp/2026 http://xbrl.sec.gov/dei/2026 true true