3.26.1 html 268 461 1 false 77 0 false 6 false false R1.htm 75000 - Document - Document And Entity Information Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 75010 - Statement - Consolidated Balance Sheets Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 75020 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 75030 - Statement - Consolidated Statements of Income Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_StatementConsolidatedStatementsOfIncome Consolidated Statements of Income Statements 4 false false R5.htm 75040 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 75050 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical Consolidated Statements of Comprehensive Income (Parenthetical) Statements 6 false false R7.htm 75060 - Statement - Consolidated Statements of Changes in Stockholders' Equity Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_StatementConsolidatedStatementsOfChangesInStockholdersEquity Consolidated Statements of Changes in Stockholders' Equity Statements 7 false false R8.htm 75080 - Statement - Consolidated Statements of Cash Flows Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 9 false false R10.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 10 false false R11.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 11 false false R12.htm 995457 - Disclosure - Cybersecurity Risk Management, Strategy, and Governance Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance Cybersecurity Risk Management, Strategy, and Governance Notes 12 false false R13.htm 995467 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 13 false false R14.htm 995477 - Disclosure - Investment Securities Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureInvestmentSecurities Investment Securities Notes 14 false false R15.htm 995487 - Disclosure - Loans and Allowance for Credit Losses Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLosses1 Loans and Allowance for Credit Losses Notes 15 false false R16.htm 995497 - Disclosure - Premises and Equipment Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosurePremisesAndEquipment Premises and Equipment Notes 16 false false R17.htm 995507 - Disclosure - Intangible Assets Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureIntangibleAssets Intangible Assets Notes 17 false false R18.htm 995517 - Disclosure - Leases Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLeases1 Leases Notes 18 false false R19.htm 995527 - Disclosure - Deposits Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureDeposits Deposits Notes 19 false false R20.htm 995537 - Disclosure - Borrowings Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureBorrowings Borrowings Notes 20 false false R21.htm 995547 - Disclosure - Income Taxes Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 21 false false R22.htm 995557 - Disclosure - Employee Stock Ownership Plan Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureEmployeeStockOwnershipPlan Employee Stock Ownership Plan Notes 22 false false R23.htm 995567 - Disclosure - Benefit Plans Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureBenefitPlans Benefit Plans Notes 23 false false R24.htm 995577 - Disclosure - Stock-Based Compensation Plans Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureStockBasedCompensationPlans Stock-Based Compensation Plans Notes 24 false false R25.htm 995587 - Disclosure - Regulatory Matters Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRegulatoryMatters Regulatory Matters Notes 25 false false R26.htm 995597 - Disclosure - Related Party Transactions Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRelatedPartyTransactions Related Party Transactions Notes 26 false false R27.htm 995607 - Disclosure - Commitments Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCommitments Commitments Notes 27 false false R28.htm 995617 - Disclosure - Fair Value Measurements and Disclosures Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsAndDisclosures Fair Value Measurements and Disclosures Notes 28 false false R29.htm 995627 - Disclosure - Condensed Parent Company Only Financial Information Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCondensedParentCompanyOnlyFinancialInformation Condensed Parent Company Only Financial Information Notes 29 false false R30.htm 995637 - Disclosure - Subsequent Event Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureSubsequentEvent1 Subsequent Event Notes 30 false false R31.htm 995647 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 31 false false R32.htm 995657 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 32 false false R33.htm 995667 - Disclosure - Investment Securities (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureInvestmentSecuritiesTables Investment Securities (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureInvestmentSecurities 33 false false R34.htm 995677 - Disclosure - Loans and Allowance for Credit Losses (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesTables Loans and Allowance for Credit Losses (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLosses1 34 false false R35.htm 995687 - Disclosure - Premises and Equipment (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosurePremisesAndEquipmentTables Premises and Equipment (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosurePremisesAndEquipment 35 false false R36.htm 995697 - Disclosure - Intangible Assets (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureIntangibleAssetsTables Intangible Assets (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureIntangibleAssets 36 false false R37.htm 995707 - Disclosure - Leases (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLeasesTables Leases (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLeases1 37 false false R38.htm 995717 - Disclosure - Deposits (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureDepositsTables Deposits (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureDeposits 38 false false R39.htm 995727 - Disclosure - Borrowings (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureBorrowingsTables Borrowings (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureBorrowings 39 false false R40.htm 995737 - Disclosure - Income Taxes (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxes 40 false false R41.htm 995747 - Disclosure - Stock-Based Compensation Plans (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureStockBasedCompensationPlansTables Stock-Based Compensation Plans (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureStockBasedCompensationPlans 41 false false R42.htm 995757 - Disclosure - Regulatory Matters (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRegulatoryMattersTables Regulatory Matters (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRegulatoryMatters 42 false false R43.htm 995767 - Disclosure - Related Party Transactions (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRelatedPartyTransactionsTables Related Party Transactions (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRelatedPartyTransactions 43 false false R44.htm 995777 - Disclosure - Commitments (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCommitmentsTables Commitments (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCommitments 44 false false R45.htm 995787 - Disclosure - Fair Value Measurements and Disclosures (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsAndDisclosuresTables Fair Value Measurements and Disclosures (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsAndDisclosures 45 false false R46.htm 995797 - Disclosure - Condensed Parent Company Only Financial Information (Tables) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCondensedParentCompanyOnlyFinancialInformationTables Condensed Parent Company Only Financial Information (Tables) Tables http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCondensedParentCompanyOnlyFinancialInformation 46 false false R47.htm 995807 - Disclosure - Summary of Significant Accounting Policies - Schedule of Calculations for Basic and Diluted Earnings Per Common Share (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfCalculationsForBasicAndDilutedEarningsPerCommonShareDetails Summary of Significant Accounting Policies - Schedule of Calculations for Basic and Diluted Earnings Per Common Share (Details) Details 47 false false R48.htm 995817 - Disclosure - Summary of Significant Accounting Policies - Schedule of Estimated Useful for Premises and Equipment (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfEstimatedUsefulForPremisesAndEquipmentDetails Summary of Significant Accounting Policies - Schedule of Estimated Useful for Premises and Equipment (Details) Details 48 false false R49.htm 995827 - Disclosure - Investment Securities - Schedule of Investment Securities Available-for-Sale (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureInvestmentSecuritiesScheduleOfInvestmentSecuritiesAvailableForSaleDetails Investment Securities - Schedule of Investment Securities Available-for-Sale (Details) Details 49 false false R50.htm 995837 - Disclosure - Investment Securities - Schedule of Investment Securities Held-to-Maturity (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureInvestmentSecuritiesScheduleOfInvestmentSecuritiesHeldtomaturityDetails Investment Securities - Schedule of Investment Securities Held-to-Maturity (Details) Details 50 false false R51.htm 995847 - Disclosure - Investment Securities - Investment Securities Available-For-Sale in An Unrealized Loss Position (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureInvestmentSecuritiesInvestmentSecuritiesAvailableforsaleInAnUnrealizedLossPositionDetails Investment Securities - Investment Securities Available-For-Sale in An Unrealized Loss Position (Details) Details 51 false false R52.htm 995857 - Disclosure - Investment Securities - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureInvestmentSecuritiesAdditionalInformationDetails Investment Securities - Additional Information (Details) Details 52 false false R53.htm 995867 - Disclosure - Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Available-for-Sale and Held to Maturity by Contractual Maturity (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureInvestmentSecuritiesScheduleOfAmortizedCostAndEstimatedFairValueOfInvestmentSecuritiesAvailableforsaleAndHeldToMaturityByContrac Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Available-for-Sale and Held to Maturity by Contractual Maturity (Details) Details 53 false false R54.htm 995877 - Disclosure - Loans and Allowance for Credit Losses - Summary of Major Classifications of Loans (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfMajorClassificationsOfLoansDetails Loans and Allowance for Credit Losses - Summary of Major Classifications of Loans (Details) Details 54 false false R55.htm 995887 - Disclosure - Loans and Allowance for Credit Losses - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesAdditionalInformationDetails Loans and Allowance for Credit Losses - Additional Information (Details) Details 55 false false R56.htm 995897 - Disclosure - Loans and Allowance for Credit Losses - Summary of Allowance for Credit Losses on Loans (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfAllowanceForCreditLossesOnLoansDetails Loans and Allowance for Credit Losses - Summary of Allowance for Credit Losses on Loans (Details) Details 56 false false R57.htm 995907 - Disclosure - Loans and Allowance for Credit Losses - Summary of Recorded Investment in Past Due Loans, as Well as Nonaccrual Loans (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfRecordedInvestmentInPastDueLoansAsWellAsNonaccrualLoansDetails Loans and Allowance for Credit Losses - Summary of Recorded Investment in Past Due Loans, as Well as Nonaccrual Loans (Details) Details 57 false false R58.htm 995927 - Disclosure - Loans and Allowance for Credit Losses - Summary of Risk Category of Loans by Class of Loans (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfRiskCategoryOfLoansByClassOfLoansDetails Loans and Allowance for Credit Losses - Summary of Risk Category of Loans by Class of Loans (Details) Details 58 false false R59.htm 995937 - Disclosure - Premises and Equipment - Summary of Premises and Equipment (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosurePremisesAndEquipmentSummaryOfPremisesAndEquipmentDetails Premises and Equipment - Summary of Premises and Equipment (Details) Details 59 false false R60.htm 995947 - Disclosure - Premises and Equipment - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosurePremisesAndEquipmentAdditionalInformationDetails Premises and Equipment - Additional Information (Details) Details 60 false false R61.htm 995957 - Disclosure - Intangible Assets - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureIntangibleAssetsAdditionalInformationDetails Intangible Assets - Additional Information (Details) Details 61 false false R62.htm 995967 - Disclosure - Intangible Assets - Schedule of Future Amortization Expense of Intangible Assets (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureIntangibleAssetsScheduleOfFutureAmortizationExpenseOfIntangibleAssetsDetails Intangible Assets - Schedule of Future Amortization Expense of Intangible Assets (Details) Details 62 false false R63.htm 995977 - Disclosure - Leases - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLeasesAdditionalInformationDetails Leases - Additional Information (Details) Details 63 false false R64.htm 995987 - Disclosure - Leases - Schedule of Consolidated Balance Sheet Classification of ROU Assets and Liabilities (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLeasesScheduleOfConsolidatedBalanceSheetClassificationOfRouAssetsAndLiabilitiesDetails Leases - Schedule of Consolidated Balance Sheet Classification of ROU Assets and Liabilities (Details) Details 64 false false R65.htm 995997 - Disclosure - Leases - Summary of Future Maturities of Operating lease Liabilities and Other Lease Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureLeasesSummaryOfFutureMaturitiesOfOperatingLeaseLiabilitiesAndOtherLeaseInformationDetails Leases - Summary of Future Maturities of Operating lease Liabilities and Other Lease Information (Details) Details 65 false false R66.htm 996017 - Disclosure - Deposits - Summary of Contractual Maturities of Certificates of Deposit (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureDepositsSummaryOfContractualMaturitiesOfCertificatesOfDepositDetails Deposits - Summary of Contractual Maturities of Certificates of Deposit (Details) Details 66 false false R67.htm 996027 - Disclosure - Deposits - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureDepositsAdditionalInformationDetails Deposits - Additional Information (Details) Details 67 false false R68.htm 996037 - Disclosure - Borrowings - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureBorrowingsAdditionalInformationDetails Borrowings - Additional Information (Details) Details 68 false false R69.htm 996047 - Disclosure - Borrowings - Schedule of Federal Home Loan Bank of Atlanta (FHLB) Advances (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureBorrowingsScheduleOfFederalHomeLoanBankOfAtlantaFhlbAdvancesDetails Borrowings - Schedule of Federal Home Loan Bank of Atlanta (FHLB) Advances (Details) Details 69 false false R70.htm 996057 - Disclosure - Income Taxes - Summary of Components of Income Tax Expense (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureIncomeTaxesSummaryOfComponentsOfIncomeTaxExpenseDetails Income Taxes - Summary of Components of Income Tax Expense (Details) Details 70 false false R71.htm 996067 - Disclosure - Income Taxes - Schedule of Difference Between Income Tax Expense and Amount Computed by Applying Statutory Federal Income Taxes Rate to Income Before Taxes (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDifferenceBetweenIncomeTaxExpenseAndAmountComputedByApplyingStatutoryFederalIncomeTaxesRateToIncomeBefore Income Taxes - Schedule of Difference Between Income Tax Expense and Amount Computed by Applying Statutory Federal Income Taxes Rate to Income Before Taxes (Details) Details 71 false false R72.htm 996077 - Disclosure - Income Taxes - Schedule of Net Deferred Taxes (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxesScheduleOfNetDeferredTaxesDetails Income Taxes - Schedule of Net Deferred Taxes (Details) Details 72 false false R73.htm 996087 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 73 false false R74.htm 996097 - Disclosure - Employee Stock Ownership Plan - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureEmployeeStockOwnershipPlanAdditionalInformationDetails Employee Stock Ownership Plan - Additional Information (Details) Details 74 false false R75.htm 996107 - Disclosure - Benefit Plans - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureBenefitPlansAdditionalInformationDetails Benefit Plans - Additional Information (Details) Details 75 false false R76.htm 996117 - Disclosure - Stock-Based Compensation Plans - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureStockBasedCompensationPlansAdditionalInformationDetails Stock-Based Compensation Plans - Additional Information (Details) Details 76 false false R77.htm 996127 - Disclosure - Stock-Based Compensation Plans - Summary of Stock Option Activity (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureStockbasedCompensationPlansSummaryOfStockOptionActivityDetails Stock-Based Compensation Plans - Summary of Stock Option Activity (Details) Details 77 false false R78.htm 996137 - Disclosure - Stock-Based Compensation Plans - Summary of Restricted Stock Activity (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureStockbasedCompensationPlansSummaryOfRestrictedStockActivityDetails Stock-Based Compensation Plans - Summary of Restricted Stock Activity (Details) Details 78 false false R79.htm 996147 - Disclosure - Stock-Based Compensation Plans - Summary of Restricted Stock Activity (Parenthetical) (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureStockbasedCompensationPlansSummaryOfRestrictedStockActivityParentheticalDetails Stock-Based Compensation Plans - Summary of Restricted Stock Activity (Parenthetical) (Details) Details 79 false false R80.htm 996157 - Disclosure - Regulatory Matters - Schedule of Bank's Actual Capital Amounts And Ratios (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRegulatoryMattersScheduleOfBankSActualCapitalAmountsAndRatiosDetails Regulatory Matters - Schedule of Bank's Actual Capital Amounts And Ratios (Details) Details 80 false false R81.htm 996167 - Disclosure - Related Party Transactions - Summary of Activity for Related Party Loans (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRelatedPartyTransactionsSummaryOfActivityForRelatedPartyLoansDetails Related Party Transactions - Summary of Activity for Related Party Loans (Details) Details 81 false false R82.htm 996177 - Disclosure - Related Party Transactions - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureRelatedPartyTransactionsAdditionalInformationDetails Related Party Transactions - Additional Information (Details) Details 82 false false R83.htm 996187 - Disclosure - Commitments - Schedule of Financial Instruments Contract Amounts Represent Credit Risk (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCommitmentsScheduleOfFinancialInstrumentsContractAmountsRepresentCreditRiskDetails Commitments - Schedule of Financial Instruments Contract Amounts Represent Credit Risk (Details) Details 83 false false R84.htm 996197 - Disclosure - Fair Value Measurements and Disclosures - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsAndDisclosuresAdditionalInformationDetails Fair Value Measurements and Disclosures - Additional Information (Details) Details 84 false false R85.htm 996207 - Disclosure - Fair Value Measurements and Disclosures - Schedule of Assets Measured at Fair Value on Nonrecurring Basis (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsAndDisclosuresScheduleOfAssetsMeasuredAtFairValueOnNonrecurringBasisDetails Fair Value Measurements and Disclosures - Schedule of Assets Measured at Fair Value on Nonrecurring Basis (Details) Details 85 false false R86.htm 996217 - Disclosure - Fair Value Measurements and Disclosures - Schedule of Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureFairValueMeasurementsAndDisclosuresScheduleOfCarryingAmountsAndEstimatedFairValuesOfCompanySFinancialInstrumentsDetails Fair Value Measurements and Disclosures - Schedule of Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Details) Details 86 false false R87.htm 996227 - Disclosure - Condensed Parent Company Only Financial Information - Summary of Condensed Balance Sheets (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCondensedParentCompanyOnlyFinancialInformationSummaryOfCondensedBalanceSheetsDetails Condensed Parent Company Only Financial Information - Summary of Condensed Balance Sheets (Details) Details 87 false false R88.htm 996237 - Disclosure - Condensed Parent Company Only Financial Information - Summary of Condensed Statements of Income (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCondensedParentCompanyOnlyFinancialInformationSummaryOfCondensedStatementsOfIncomeDetails Condensed Parent Company Only Financial Information - Summary of Condensed Statements of Income (Details) Details 88 false false R89.htm 996247 - Disclosure - Condensed Parent Company Only Financial Information - Summary of Condensed Statements of Cash Flows (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/Role_DisclosureCondensedParentCompanyOnlyFinancialInformationSummaryOfCondensedStatementsOfCashFlowsDetails Condensed Parent Company Only Financial Information - Summary of Condensed Statements of Cash Flows (Details) Details 89 false false R90.htm 996257 - Disclosure - Subsequent Event - Additional Information (Details) Sheet http://www.affinitybankshares.com/20251231/taxonomy/role/DisclosureSubsequentEventAdditionalInformationDetails Subsequent Event - Additional Information (Details) Details 90 false false All Reports Book All Reports afbi-20251231.htm afbi-20251231.xsd img208812980_0.jpg http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 false false