3.26.3 html 564 552 1 true 105 0 false 11 false false R1.htm 000 - Document - Document And Entity Information Sheet http://atlam.com/role/DocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 001 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://atlam.com/role/ConsolidatedBalanceSheet CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 002 - Statement - CONSOLIDATED BALANCE SHEETS (Parentheticals) Sheet http://atlam.com/role/ConsolidatedBalanceSheet_Parentheticals CONSOLIDATED BALANCE SHEETS (Parentheticals) Statements 3 false false R4.htm 003 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://atlam.com/role/ConsolidatedIncomeStatement CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 004 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://atlam.com/role/ConsolidatedComprehensiveIncome CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 005 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Sheet http://atlam.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYTable CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Statements 6 false false R7.htm 006 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://atlam.com/role/ConsolidatedCashFlow CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 7 false false R8.htm 007 - Disclosure - Summary of Significant Accounting Policies Sheet http://atlam.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 8 false false R9.htm 008 - Disclosure - Investments Sheet http://atlam.com/role/Investments Investments Notes 9 false false R10.htm 009 - Disclosure - Disclosures About Fair Value of Financial Instruments Sheet http://atlam.com/role/DisclosuresAboutFairValueofFinancialInstruments Disclosures About Fair Value of Financial Instruments Notes 10 false false R11.htm 010 - Disclosure - Allowance for Expected Credit Losses Sheet http://atlam.com/role/AllowanceforExpectedCreditLosses Allowance for Expected Credit Losses Notes 11 false false R12.htm 011 - Disclosure - Deferred Policy Acquisition Costs Sheet http://atlam.com/role/DeferredPolicyAcquisitionCosts Deferred Policy Acquisition Costs Notes 12 false false R13.htm 012 - Disclosure - Internal-Use Software Sheet http://atlam.com/role/InternalUseSoftware Internal-Use Software Notes 13 false false R14.htm 013 - Disclosure - Future Policy Benefits Sheet http://atlam.com/role/FuturePolicyBenefits Future Policy Benefits Notes 14 false false R15.htm 014 - Disclosure - Other Insurance Reserves and Policyholder Funds Sheet http://atlam.com/role/OtherInsuranceReservesandPolicyholderFunds Other Insurance Reserves and Policyholder Funds Notes 15 false false R16.htm 015 - Disclosure - Reinsurance Sheet http://atlam.com/role/Reinsurance Reinsurance Notes 16 false false R17.htm 016 - Disclosure - Income Taxes Sheet http://atlam.com/role/IncomeTaxes Income Taxes Notes 17 false false R18.htm 017 - Disclosure - Credit Arrangements Sheet http://atlam.com/role/CreditArrangements Credit Arrangements Notes 18 false false R19.htm 018 - Disclosure - Leases Sheet http://atlam.com/role/Leases Leases Notes 19 false false R20.htm 019 - Disclosure - Benefit Plans Sheet http://atlam.com/role/BenefitPlans Benefit Plans Notes 20 false false R21.htm 020 - Disclosure - Preferred Stock Sheet http://atlam.com/role/PreferredStock Preferred Stock Notes 21 false false R22.htm 021 - Disclosure - Earnings (Loss) Per Common Share Sheet http://atlam.com/role/EarningsLossPerCommonShare Earnings (Loss) Per Common Share Notes 22 false false R23.htm 022 - Disclosure - Statutory Reporting Sheet http://atlam.com/role/StatutoryReporting Statutory Reporting Notes 23 false false R24.htm 023 - Disclosure - Related Party Transactions Sheet http://atlam.com/role/RelatedPartyTransactions Related Party Transactions Notes 24 false false R25.htm 024 - Disclosure - Segment Information Sheet http://atlam.com/role/SegmentInformation Segment Information Notes 25 false false R26.htm 025 - Disclosure - Commitments and Contingencies Sheet http://atlam.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 26 false false R27.htm 026 - Disclosure - Subsequent Events Sheet http://atlam.com/role/SubsequentEvents Subsequent Events Notes 27 false false R28.htm 027 - Disclosure - Schedule II CONDENSED FINANCIAL INFORMATION OF REGISTRANT Sheet http://atlam.com/role/ScheduleIICONDENSEDFINANCIALINFORMATIONOFREGISTRANT Schedule II CONDENSED FINANCIAL INFORMATION OF REGISTRANT Notes 28 false false R29.htm 028 - Disclosure - Schedule III SUPPLEMENTARY INSURANCE INFORMATION Sheet http://atlam.com/role/ScheduleIIISUPPLEMENTARYINSURANCEINFORMATION Schedule III SUPPLEMENTARY INSURANCE INFORMATION Notes 29 false false R30.htm 029 - Disclosure - Schedule IV REINSURANCE INFORMATION Sheet http://atlam.com/role/ScheduleIVREINSURANCEINFORMATION Schedule IV REINSURANCE INFORMATION Notes 30 false false R31.htm 030 - Disclosure - Schedule VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS Sheet http://atlam.com/role/ScheduleVISUPPLEMENTALINFORMATIONCONCERNINGPROPERTYCASUALTYINSURANCEOPERATIONS Schedule VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS Notes 31 false false R32.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 32 false false R33.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 33 false false R34.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 34 false false R35.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 35 false false R36.htm 996000 - Disclosure - Accounting Policies, by Policy (Policies) Sheet http://atlam.com/role/AccountingPoliciesByPolicy Accounting Policies, by Policy (Policies) Policies http://atlam.com/role/SummaryofSignificantAccountingPolicies 36 false false R37.htm 996001 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://atlam.com/role/SummaryofSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://atlam.com/role/SummaryofSignificantAccountingPolicies 37 false false R38.htm 996002 - Disclosure - Investments (Tables) Sheet http://atlam.com/role/InvestmentsTables Investments (Tables) Tables http://atlam.com/role/Investments 38 false false R39.htm 996003 - Disclosure - Disclosures About Fair Value of Financial Instruments (Tables) Sheet http://atlam.com/role/DisclosuresAboutFairValueofFinancialInstrumentsTables Disclosures About Fair Value of Financial Instruments (Tables) Tables http://atlam.com/role/DisclosuresAboutFairValueofFinancialInstruments 39 false false R40.htm 996004 - Disclosure - Allowance for Expected Credit Losses (Tables) Sheet http://atlam.com/role/AllowanceforExpectedCreditLossesTables Allowance for Expected Credit Losses (Tables) Tables http://atlam.com/role/AllowanceforExpectedCreditLosses 40 false false R41.htm 996005 - Disclosure - Deferred Policy Acquisition Costs (Tables) Sheet http://atlam.com/role/DeferredPolicyAcquisitionCostsTables Deferred Policy Acquisition Costs (Tables) Tables http://atlam.com/role/DeferredPolicyAcquisitionCosts 41 false false R42.htm 996006 - Disclosure - Future Policy Benefits (Tables) Sheet http://atlam.com/role/FuturePolicyBenefitsTables Future Policy Benefits (Tables) Tables http://atlam.com/role/FuturePolicyBenefits 42 false false R43.htm 996007 - Disclosure - Other Insurance Reserves and Policyholder Funds (Tables) Sheet http://atlam.com/role/OtherInsuranceReservesandPolicyholderFundsTables Other Insurance Reserves and Policyholder Funds (Tables) Tables http://atlam.com/role/OtherInsuranceReservesandPolicyholderFunds 43 false false R44.htm 996008 - Disclosure - Reinsurance (Tables) Sheet http://atlam.com/role/ReinsuranceTables Reinsurance (Tables) Tables http://atlam.com/role/Reinsurance 44 false false R45.htm 996009 - Disclosure - Income Taxes (Tables) Sheet http://atlam.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://atlam.com/role/IncomeTaxes 45 false false R46.htm 996010 - Disclosure - Credit Arrangements (Tables) Sheet http://atlam.com/role/CreditArrangementsTables Credit Arrangements (Tables) Tables http://atlam.com/role/CreditArrangements 46 false false R47.htm 996011 - Disclosure - Leases (Tables) Sheet http://atlam.com/role/LeasesTables Leases (Tables) Tables http://atlam.com/role/Leases 47 false false R48.htm 996012 - Disclosure - Earnings (Loss) Per Common Share (Tables) Sheet http://atlam.com/role/EarningsLossPerCommonShareTables Earnings (Loss) Per Common Share (Tables) Tables http://atlam.com/role/EarningsLossPerCommonShare 48 false false R49.htm 996013 - Disclosure - Statutory Reporting (Tables) Sheet http://atlam.com/role/StatutoryReportingTables Statutory Reporting (Tables) Tables http://atlam.com/role/StatutoryReporting 49 false false R50.htm 996014 - Disclosure - Segment Information (Tables) Sheet http://atlam.com/role/SegmentInformationTables Segment Information (Tables) Tables http://atlam.com/role/SegmentInformation 50 false false R51.htm 996015 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://atlam.com/role/SummaryofSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) Details http://atlam.com/role/SummaryofSignificantAccountingPoliciesTables 51 false false R52.htm 996016 - Disclosure - Summary of Significant Accounting Policies - Previously Reported Financial Statement Tables (Details) Sheet http://atlam.com/role/PreviouslyReportedFinancialStatementTablesTable Summary of Significant Accounting Policies - Previously Reported Financial Statement Tables (Details) Details 52 false false R53.htm 996017 - Disclosure - Summary of Significant Accounting Policies - Reclassifications and Adjustments to the Consolidated Balance Sheet (Details) Sheet http://atlam.com/role/ReclassificationsandAdjustmentstotheConsolidatedBalanceSheetTable Summary of Significant Accounting Policies - Reclassifications and Adjustments to the Consolidated Balance Sheet (Details) Details 53 false false R54.htm 996018 - Disclosure - Investments (Details) Sheet http://atlam.com/role/InvestmentsDetails Investments (Details) Details http://atlam.com/role/InvestmentsTables 54 false false R55.htm 996019 - Disclosure - Investments - Investments Aggregated by Type and Industry (Details) Sheet http://atlam.com/role/InvestmentsAggregatedbyTypeandIndustryTable Investments - Investments Aggregated by Type and Industry (Details) Details 55 false false R56.htm 996020 - Disclosure - Investments - Amortized Cost and Carrying Value of Fixed Maturities by Contractual Maturity (Details) Sheet http://atlam.com/role/AmortizedCostandCarryingValueofFixedMaturitiesbyContractualMaturityTable Investments - Amortized Cost and Carrying Value of Fixed Maturities by Contractual Maturity (Details) Details 56 false false R57.htm 996021 - Disclosure - Investments - Investment Securities with Continuous Unrealized Loss Position (Details) Sheet http://atlam.com/role/InvestmentSecuritieswithContinuousUnrealizedLossPositionTable Investments - Investment Securities with Continuous Unrealized Loss Position (Details) Details 57 false false R58.htm 996022 - Disclosure - Investments - Investment Income Earned (Details) Sheet http://atlam.com/role/InvestmentIncomeEarnedTable Investments - Investment Income Earned (Details) Details 58 false false R59.htm 996023 - Disclosure - Investments - Summary of Realized Investment Gains (Losses) (Details) Sheet http://atlam.com/role/SummaryofRealizedInvestmentGainsLossesTable Investments - Summary of Realized Investment Gains (Losses) (Details) Details 59 false false R60.htm 996024 - Disclosure - Investments - Proceeds from Sales of Investments (Details) Sheet http://atlam.com/role/ProceedsfromSalesofInvestmentsTable Investments - Proceeds from Sales of Investments (Details) Details 60 false false R61.htm 996025 - Disclosure - Investments - Unrealized Gains (Losses) on Equity Securities (Details) Sheet http://atlam.com/role/UnrealizedGainsLossesonEquitySecuritiesTable Investments - Unrealized Gains (Losses) on Equity Securities (Details) Details 61 false false R62.htm 996026 - Disclosure - Disclosures About Fair Value of Financial Instruments (Details) Sheet http://atlam.com/role/DisclosuresAboutFairValueofFinancialInstrumentsDetails Disclosures About Fair Value of Financial Instruments (Details) Details http://atlam.com/role/DisclosuresAboutFairValueofFinancialInstrumentsTables 62 false false R63.htm 996027 - Disclosure - Disclosures About Fair Value of Financial Instruments - Financial Instruments Carried at Fair Value Measured on a Recurring Basis (Details) Sheet http://atlam.com/role/FinancialInstrumentsCarriedatFairValueMeasuredonaRecurringBasisTable Disclosures About Fair Value of Financial Instruments - Financial Instruments Carried at Fair Value Measured on a Recurring Basis (Details) Details 63 false false R64.htm 996028 - Disclosure - Disclosures About Fair Value of Financial Instruments - Carrying Amount, Estimated Fair Value and Level within the Fair Value Hierarchy of Financial Instruments (Details) Sheet http://atlam.com/role/CarryingAmountEstimatedFairValueandLevelwithintheFairValueHierarchyofFinancialInstrumentsTable Disclosures About Fair Value of Financial Instruments - Carrying Amount, Estimated Fair Value and Level within the Fair Value Hierarchy of Financial Instruments (Details) Details 64 false false R65.htm 996029 - Disclosure - Allowance for Expected Credit Losses - Reinsurance Recoverables (Details) Sheet http://atlam.com/role/ReinsuranceRecoverablesTable Allowance for Expected Credit Losses - Reinsurance Recoverables (Details) Details 65 false false R66.htm 996030 - Disclosure - Allowance for Expected Credit Losses - Insurance Premium and Other Receivables (Details) Sheet http://atlam.com/role/InsurancePremiumandOtherReceivablesTable Allowance for Expected Credit Losses - Insurance Premium and Other Receivables (Details) Details 66 false false R67.htm 996031 - Disclosure - Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs by Segment (Details) Sheet http://atlam.com/role/DeferredPolicyAcquisitionCostsbySegmentTable Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs by Segment (Details) Details 67 false false R68.htm 996032 - Disclosure - Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs for American Southern (Details) Sheet http://atlam.com/role/DeferredPolicyAcquisitionCostsforAmericanSouthernTable Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs for American Southern (Details) Details 68 false false R69.htm 996033 - Disclosure - Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs for Bankers Fidelity (Details) Sheet http://atlam.com/role/DeferredPolicyAcquisitionCostsforBankersFidelityTable Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs for Bankers Fidelity (Details) Details 69 false false R70.htm 996034 - Disclosure - Internal-Use Software (Details) Sheet http://atlam.com/role/InternalUseSoftwareDetails Internal-Use Software (Details) Details http://atlam.com/role/InternalUseSoftware 70 false false R71.htm 996035 - Disclosure - Future Policy Benefits (Details) Sheet http://atlam.com/role/FuturePolicyBenefitsDetails Future Policy Benefits (Details) Details http://atlam.com/role/FuturePolicyBenefitsTables 71 false false R72.htm 996036 - Disclosure - Future Policy Benefits - Liability for Future Policy Benefits, Net (Details) Sheet http://atlam.com/role/LiabilityforFuturePolicyBenefitsNetTable Future Policy Benefits - Liability for Future Policy Benefits, Net (Details) Details 72 false false R73.htm 996037 - Disclosure - Future Policy Benefits - Balances of and Changes in the Liability for Future Policy Benefits (Details) Sheet http://atlam.com/role/BalancesofandChangesintheLiabilityforFuturePolicyBenefitsTable Future Policy Benefits - Balances of and Changes in the Liability for Future Policy Benefits (Details) Details 73 false false R74.htm 996038 - Disclosure - Future Policy Benefits - Weighted Average Interest Rates (Details) Sheet http://atlam.com/role/WeightedAverageInterestRatesTable Future Policy Benefits - Weighted Average Interest Rates (Details) Details 74 false false R75.htm 996039 - Disclosure - Future Policy Benefits - Undiscounted and Discounted Future Gross Premiums and Expected Future Benefit Payments (Details) Sheet http://atlam.com/role/UndiscountedandDiscountedFutureGrossPremiumsandExpectedFutureBenefitPaymentsTable Future Policy Benefits - Undiscounted and Discounted Future Gross Premiums and Expected Future Benefit Payments (Details) Details 75 false false R76.htm 996040 - Disclosure - Future Policy Benefits - Revenue and Interest Accretion (Expense) (Details) Sheet http://atlam.com/role/RevenueandInterestAccretionExpenseTable Future Policy Benefits - Revenue and Interest Accretion (Expense) (Details) Details 76 false false R77.htm 996041 - Disclosure - Other Insurance Reserves and Policyholder Funds (Details) Sheet http://atlam.com/role/OtherInsuranceReservesandPolicyholderFundsDetails Other Insurance Reserves and Policyholder Funds (Details) Details http://atlam.com/role/OtherInsuranceReservesandPolicyholderFundsTables 77 false false R78.htm 996042 - Disclosure - Other Insurance Reserves and Policyholder Funds - Summary of Activity in Liabilities for Unpaid Loss and Claim Reserved (Details) Sheet http://atlam.com/role/SummaryofActivityinLiabilitiesforUnpaidLossandClaimReservedTable Other Insurance Reserves and Policyholder Funds - Summary of Activity in Liabilities for Unpaid Loss and Claim Reserved (Details) Details 78 false false R79.htm 996043 - Disclosure - Other Insurance Reserves and Policyholder Funds - Reconciliation of Total Incurred Losses to Total Insurance Benefits and Losses (Details) Sheet http://atlam.com/role/ReconciliationofTotalIncurredLossestoTotalInsuranceBenefitsandLossesTable Other Insurance Reserves and Policyholder Funds - Reconciliation of Total Incurred Losses to Total Insurance Benefits and Losses (Details) Details 79 false false R80.htm 996044 - Disclosure - Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Medicare Supplement (Details) Sheet http://atlam.com/role/InformationAboutIncurredandPaidClaimsDevelopmentMedicareSupplementTable Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Medicare Supplement (Details) Details 80 false false R81.htm 996045 - Disclosure - Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Automobile Liability (Details) Sheet http://atlam.com/role/InformationAboutIncurredandPaidClaimsDevelopmentAutomobileLiabilityTable Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Automobile Liability (Details) Details 81 false false R82.htm 996046 - Disclosure - Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Automobile Physical Damage (Details) Sheet http://atlam.com/role/InformationAboutIncurredandPaidClaimsDevelopmentAutomobilePhysicalDamageTable Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Automobile Physical Damage (Details) Details 82 false false R83.htm 996047 - Disclosure - Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, General Liability (Details) Sheet http://atlam.com/role/InformationAboutIncurredandPaidClaimsDevelopmentGeneralLiabilityTable Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, General Liability (Details) Details 83 false false R84.htm 996048 - Disclosure - Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Surety (Details) Sheet http://atlam.com/role/InformationAboutIncurredandPaidClaimsDevelopmentSuretyTable Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Surety (Details) Details 84 false false R85.htm 996049 - Disclosure - Other Insurance Reserves and Policyholder Funds - Supplementary Information about Average Historical Claims Duration (Details) Sheet http://atlam.com/role/SupplementaryInformationaboutAverageHistoricalClaimsDurationTable Other Insurance Reserves and Policyholder Funds - Supplementary Information about Average Historical Claims Duration (Details) Details 85 false false R86.htm 996050 - Disclosure - Other Insurance Reserves and Policyholder Funds - Reconciliation of Net Incurred and Paid Claims Development (Details) Sheet http://atlam.com/role/ReconciliationofNetIncurredandPaidClaimsDevelopmentTable Other Insurance Reserves and Policyholder Funds - Reconciliation of Net Incurred and Paid Claims Development (Details) Details 86 false false R87.htm 996051 - Disclosure - Reinsurance (Details) Sheet http://atlam.com/role/ReinsuranceDetails Reinsurance (Details) Details http://atlam.com/role/ReinsuranceTables 87 false false R88.htm 996052 - Disclosure - Reinsurance - Effects of Reinsurance on Premiums Written, Premiums Earned and Insurance Benefits and Losses Incurred (Details) Sheet http://atlam.com/role/EffectsofReinsuranceonPremiumsWrittenPremiumsEarnedandInsuranceBenefitsandLossesIncurredTable Reinsurance - Effects of Reinsurance on Premiums Written, Premiums Earned and Insurance Benefits and Losses Incurred (Details) Details 88 false false R89.htm 996053 - Disclosure - Reinsurance - Components of Reinsurance Receivables (Details) Sheet http://atlam.com/role/ComponentsofReinsuranceReceivablesTable Reinsurance - Components of Reinsurance Receivables (Details) Details 89 false false R90.htm 996054 - Disclosure - Reinsurance - Reinsurance Concentration (Details) Sheet http://atlam.com/role/ReinsuranceConcentrationTable Reinsurance - Reinsurance Concentration (Details) Details 90 false false R91.htm 996055 - Disclosure - Income Taxes (Details) Sheet http://atlam.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://atlam.com/role/IncomeTaxesTables 91 false false R92.htm 996056 - Disclosure - Income Taxes - Allocation of Total Income Taxes (Details) Sheet http://atlam.com/role/AllocationofTotalIncomeTaxesTable Income Taxes - Allocation of Total Income Taxes (Details) Details 92 false false R93.htm 996057 - Disclosure - Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) Sheet http://atlam.com/role/ReconciliationofIncomeTaxExpenseBenefitTable Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) Details 93 false false R94.htm 996058 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details) Sheet http://atlam.com/role/DeferredTaxAssetsandLiabilitiesTable Income Taxes - Deferred Tax Assets and Liabilities (Details) Details 94 false false R95.htm 996059 - Disclosure - Income Taxes - Components of Income Tax Expense (Benefit) (Details) Sheet http://atlam.com/role/ComponentsofIncomeTaxExpenseBenefitTable Income Taxes - Components of Income Tax Expense (Benefit) (Details) Details 95 false false R96.htm 996060 - Disclosure - Credit Arrangements - Bank Debt (Details) Sheet http://atlam.com/role/CreditArrangementsDetailsBankDebt Credit Arrangements - Bank Debt (Details) Details 96 false false R97.htm 996061 - Disclosure - Credit Arrangements - Junior Subordinated Debentures (Details) Sheet http://atlam.com/role/CreditArrangementsDetailsJuniorSubordinatedDebentures Credit Arrangements - Junior Subordinated Debentures (Details) Details 97 false false R98.htm 996062 - Disclosure - Credit Arrangements - Financial Structure of Statutory Business Trusts (Details) Sheet http://atlam.com/role/FinancialStructureofStatutoryBusinessTrustsTable Credit Arrangements - Financial Structure of Statutory Business Trusts (Details) Details 98 false false R99.htm 996063 - Disclosure - Leases (Details) Sheet http://atlam.com/role/LeasesDetails Leases (Details) Details http://atlam.com/role/LeasesTables 99 false false R100.htm 996064 - Disclosure - Leases - Additional Information of Operating Leases (Details) Sheet http://atlam.com/role/AdditionalInformationofOperatingLeasesTable Leases - Additional Information of Operating Leases (Details) Details 100 false false R101.htm 996065 - Disclosure - Leases - Maturities and Present Value of Lease Liabilities (Details) Sheet http://atlam.com/role/MaturitiesandPresentValueofLeaseLiabilitiesTable Leases - Maturities and Present Value of Lease Liabilities (Details) Details 101 false false R102.htm 996066 - Disclosure - Benefit Plans (Details) Sheet http://atlam.com/role/BenefitPlansDetails Benefit Plans (Details) Details http://atlam.com/role/BenefitPlans 102 false false R103.htm 996067 - Disclosure - Preferred Stock (Details) Sheet http://atlam.com/role/PreferredStockDetails Preferred Stock (Details) Details http://atlam.com/role/PreferredStock 103 false false R104.htm 996068 - Disclosure - Earnings (Loss) Per Common Share - Reconciliation of Numerator and Denominator of Income (Loss) per Common Share Calculations (Details) Sheet http://atlam.com/role/EarningsLossPerCommonShareDetailsReconciliationofNumeratorandDenominatorofIncomeLossperCommonShareCalculations Earnings (Loss) Per Common Share - Reconciliation of Numerator and Denominator of Income (Loss) per Common Share Calculations (Details) Details http://atlam.com/role/EarningsLossPerCommonShareTables 104 false false R105.htm 996069 - Disclosure - Statutory Reporting (Details) Sheet http://atlam.com/role/StatutoryReportingDetails Statutory Reporting (Details) Details http://atlam.com/role/StatutoryReportingTables 105 false false R106.htm 996070 - Disclosure - Statutory Reporting - Reported Statutory Net Income and Capital and Surplus for the Parent's Insurance Subsidiaries (Details) Sheet http://atlam.com/role/ReportedStatutoryNetIncomeandCapitalandSurplusfortheParentsInsuranceSubsidiariesTable Statutory Reporting - Reported Statutory Net Income and Capital and Surplus for the Parent's Insurance Subsidiaries (Details) Details 106 false false R107.htm 996071 - Disclosure - Related Party Transactions (Details) Sheet http://atlam.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://atlam.com/role/RelatedPartyTransactions 107 false false R108.htm 996072 - Disclosure - Segment Information (Details) Sheet http://atlam.com/role/SegmentInformationDetails Segment Information (Details) Details http://atlam.com/role/SegmentInformationTables 108 false false R109.htm 996073 - Disclosure - Segment Information - Assets, Revenue Income (Loss) Before Income Taxes for Each Business Unit (Details) Sheet http://atlam.com/role/AssetsRevenueIncomeLossBeforeIncomeTaxesforEachBusinessUnitTable Segment Information - Assets, Revenue Income (Loss) Before Income Taxes for Each Business Unit (Details) Details 109 false false R110.htm 996074 - Disclosure - Schedule II CONDENSED FINANCIAL INFORMATION OF REGISTRANT - BALANCE SHEETS (Details) Sheet http://atlam.com/role/BALANCESHEETSTable Schedule II CONDENSED FINANCIAL INFORMATION OF REGISTRANT - BALANCE SHEETS (Details) Details 110 false false R111.htm 996075 - Disclosure - Schedule II CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF OPERATIONS (Details) Sheet http://atlam.com/role/STATEMENTSOFOPERATIONSTable Schedule II CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF OPERATIONS (Details) Details 111 false false R112.htm 996076 - Disclosure - Schedule II CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF CASH FLOWS (Details) Sheet http://atlam.com/role/STATEMENTSOFCASHFLOWSTable Schedule II CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF CASH FLOWS (Details) Details 112 false false R113.htm 996077 - Disclosure - Schedule III SUPPLEMENTARY INSURANCE INFORMATION - Schedule III SUPPLEMENTARY INSURANCE INFORMATION (Details) Sheet http://atlam.com/role/ScheduleIIISUPPLEMENTARYINSURANCEINFORMATIONTable Schedule III SUPPLEMENTARY INSURANCE INFORMATION - Schedule III SUPPLEMENTARY INSURANCE INFORMATION (Details) Details 113 false false R114.htm 996078 - Disclosure - Schedule IV REINSURANCE INFORMATION - Schedule IV REINSURANCE INFORMATION (Details) Sheet http://atlam.com/role/ScheduleIVREINSURANCEINFORMATIONTable Schedule IV REINSURANCE INFORMATION - Schedule IV REINSURANCE INFORMATION (Details) Details 114 false false R115.htm 996079 - Disclosure - Schedule VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS - Schedule VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS (Details) Sheet http://atlam.com/role/ScheduleVISUPPLEMENTALINFORMATIONCONCERNINGPROPERTYCASUALTYINSURANCEOPERATIONSTable Schedule VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS - Schedule VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS (Details) Details 115 false false All Reports Book All Reports aame-20251231.xsd aame-20251231_cal.xml aame-20251231_def.xml aame-20251231_lab.xml aame-20251231_pre.xml ef20060652_10k.htm image1.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 true true