3.22.1 html 150 265 1 false 43 0 false 7 false false R1.htm 000100 - Document - Document and Entity Information Sheet http://donegalgroup.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 010000 - Statement - Consolidated Balance Sheets Sheet http://donegalgroup.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 010100 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://donegalgroup.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 020000 - Statement - Consolidated Statements of Income Sheet http://donegalgroup.com/role/ConsolidatedStatementsOfIncome Consolidated Statements of Income Statements 4 false false R5.htm 020100 - Statement - Consolidated Statements of Income (Parenthetical) Sheet http://donegalgroup.com/role/ConsolidatedStatementsOfIncomeParenthetical Consolidated Statements of Income (Parenthetical) Statements 5 false false R6.htm 030000 - Statement - Consolidated Statements of Comprehensive (Loss) Income Sheet http://donegalgroup.com/role/ConsolidatedStatementsOfComprehensiveLossIncome Consolidated Statements of Comprehensive (Loss) Income Statements 6 false false R7.htm 030100 - Statement - Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) Sheet http://donegalgroup.com/role/ConsolidatedStatementsOfComprehensiveLossIncomeParenthetical Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) Statements 7 false false R8.htm 040000 - Statement - Consolidated Statement of Stockholders' Equity Sheet http://donegalgroup.com/role/ConsolidatedStatementOfStockholdersEquity Consolidated Statement of Stockholders' Equity Statements 8 false false R9.htm 050000 - Statement - Consolidated Statements of Cash Flows Sheet http://donegalgroup.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 9 false false R10.htm 060100 - Disclosure - Organization Sheet http://donegalgroup.com/role/Organization Organization Notes 10 false false R11.htm 060200 - Disclosure - Basis of Presentation Sheet http://donegalgroup.com/role/BasisOfPresentation Basis of Presentation Notes 11 false false R12.htm 060300 - Disclosure - Earnings Per Share Sheet http://donegalgroup.com/role/EarningsPerShare Earnings Per Share Notes 12 false false R13.htm 060400 - Disclosure - Reinsurance Sheet http://donegalgroup.com/role/Reinsurance Reinsurance Notes 13 false false R14.htm 060500 - Disclosure - Investments Sheet http://donegalgroup.com/role/Investments Investments Notes 14 false false R15.htm 060600 - Disclosure - Segment Information Sheet http://donegalgroup.com/role/SegmentInformation Segment Information Notes 15 false false R16.htm 060700 - Disclosure - Borrowings Sheet http://donegalgroup.com/role/Borrowings Borrowings Notes 16 false false R17.htm 060800 - Disclosure - Share-Based Compensation Sheet http://donegalgroup.com/role/SharebasedCompensation Share-Based Compensation Notes 17 false false R18.htm 060900 - Disclosure - Fair Value Measurements Sheet http://donegalgroup.com/role/FairValueMeasurements Fair Value Measurements Notes 18 false false R19.htm 061000 - Disclosure - Income Taxes Sheet http://donegalgroup.com/role/IncomeTaxes Income Taxes Notes 19 false false R20.htm 061100 - Disclosure - Liabilities for Losses and Loss Expenses Sheet http://donegalgroup.com/role/LiabilitiesForLossesAndLossExpenses Liabilities for Losses and Loss Expenses Notes 20 false false R21.htm 061200 - Disclosure - Impact of New Accounting Standards Sheet http://donegalgroup.com/role/ImpactOfNewAccountingStandards Impact of New Accounting Standards Notes 21 false false R22.htm 070100 - Disclosure - Organization (Policies) Sheet http://donegalgroup.com/role/OrganizationPolicies Organization (Policies) Policies http://donegalgroup.com/role/ImpactOfNewAccountingStandards 22 false false R23.htm 071200 - Disclosure - Impact of New Accounting Standards (Policies) Sheet http://donegalgroup.com/role/ImpactOfNewAccountingStandardsPolicies Impact of New Accounting Standards (Policies) Policies http://donegalgroup.com/role/ImpactOfNewAccountingStandards 23 false false R24.htm 080300 - Disclosure - Earnings Per Share (Tables) Sheet http://donegalgroup.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://donegalgroup.com/role/EarningsPerShare 24 false false R25.htm 080500 - Disclosure - Investments (Tables) Sheet http://donegalgroup.com/role/InvestmentsTables Investments (Tables) Tables http://donegalgroup.com/role/Investments 25 false false R26.htm 080600 - Disclosure - Segment Information (Tables) Sheet http://donegalgroup.com/role/SegmentInformationTables Segment Information (Tables) Tables http://donegalgroup.com/role/SegmentInformation 26 false false R27.htm 080700 - Disclosure - Borrowings (Tables) Sheet http://donegalgroup.com/role/BorrowingsTables Borrowings (Tables) Tables http://donegalgroup.com/role/Borrowings 27 false false R28.htm 080900 - Disclosure - Fair Value Measurements (Tables) Sheet http://donegalgroup.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://donegalgroup.com/role/FairValueMeasurements 28 false false R29.htm 081100 - Disclosure - Liabilities for Losses and Loss Expenses (Tables) Sheet http://donegalgroup.com/role/LiabilitiesForLossesAndLossExpensesTables Liabilities for Losses and Loss Expenses (Tables) Tables http://donegalgroup.com/role/LiabilitiesForLossesAndLossExpenses 29 false false R30.htm 090100 - Disclosure - Organization (Details) Sheet http://donegalgroup.com/role/OrganizationDetails Organization (Details) Details http://donegalgroup.com/role/OrganizationPolicies 30 false false R31.htm 090302 - Disclosure - Earnings Per Share (Details) Sheet http://donegalgroup.com/role/EarningsPerShareDetails Earnings Per Share (Details) Details http://donegalgroup.com/role/EarningsPerShareTables 31 false false R32.htm 090400 - Disclosure - Reinsurance (Details) Sheet http://donegalgroup.com/role/ReinsuranceDetails Reinsurance (Details) Details http://donegalgroup.com/role/Reinsurance 32 false false R33.htm 090500 - Disclosure - Investments, Amortized Cost and Estimated Fair Values of Fixed Maturities (Details) Sheet http://donegalgroup.com/role/InvestmentsAmortizedCostAndEstimatedFairValuesOfFixedMaturitiesDetails Investments, Amortized Cost and Estimated Fair Values of Fixed Maturities (Details) Details 33 false false R34.htm 090502 - Disclosure - Investments, Summary (Details) Sheet http://donegalgroup.com/role/InvestmentsSummaryDetails Investments, Summary (Details) Details 34 false false R35.htm 090504 - Disclosure - Investments, Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity (Details) Sheet http://donegalgroup.com/role/InvestmentsAmortizedCostAndEstimatedFairValueOfFixedMaturitiesByContractualMaturityDetails Investments, Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity (Details) Details 35 false false R36.htm 090506 - Disclosure - Investments, Cost and Estimated Fair Value of Equity Securities (Details) Sheet http://donegalgroup.com/role/InvestmentsCostAndEstimatedFairValueOfEquitySecuritiesDetails Investments, Cost and Estimated Fair Value of Equity Securities (Details) Details 36 false false R37.htm 090508 - Disclosure - Investments, Gross Investment Gains and Losses before Applicable Income Taxes (Details) Sheet http://donegalgroup.com/role/InvestmentsGrossInvestmentGainsAndLossesBeforeApplicableIncomeTaxesDetails Investments, Gross Investment Gains and Losses before Applicable Income Taxes (Details) Details 37 false false R38.htm 090510 - Disclosure - Investments, Fixed Maturities with Unrealized Losses (Details) Sheet http://donegalgroup.com/role/InvestmentsFixedMaturitiesWithUnrealizedLossesDetails Investments, Fixed Maturities with Unrealized Losses (Details) Details 38 false false R39.htm 090600 - Disclosure - Segment Information (Details) Sheet http://donegalgroup.com/role/SegmentInformationDetails Segment Information (Details) Details http://donegalgroup.com/role/SegmentInformationTables 39 false false R40.htm 090702 - Disclosure - Borrowings, Line of Credit (Details) Sheet http://donegalgroup.com/role/BorrowingsLineOfCreditDetails Borrowings, Line of Credit (Details) Details 40 false false R41.htm 090800 - Disclosure - Share-Based Compensation (Details) Sheet http://donegalgroup.com/role/SharebasedCompensationDetails Share-Based Compensation (Details) Details http://donegalgroup.com/role/SharebasedCompensation 41 false false R42.htm 090900 - Disclosure - Fair Value Measurements (Details) Sheet http://donegalgroup.com/role/FairValueMeasurementsDetails Fair Value Measurements (Details) Details http://donegalgroup.com/role/FairValueMeasurementsTables 42 false false R43.htm 091000 - Disclosure - Income Taxes (Details) Sheet http://donegalgroup.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://donegalgroup.com/role/IncomeTaxes 43 false false R44.htm 091100 - Disclosure - Liabilities for Losses and Loss Expenses (Details) Sheet http://donegalgroup.com/role/LiabilitiesForLossesAndLossExpensesDetails Liabilities for Losses and Loss Expenses (Details) Details http://donegalgroup.com/role/LiabilitiesForLossesAndLossExpensesTables 44 false false All Reports Book All Reports brhc10037124_10q.htm brhc10037124_ex31-1.htm brhc10037124_ex31-2.htm brhc10037124_ex32-1.htm brhc10037124_ex32-2.htm dgica-20220331.xsd dgica-20220331_cal.xml dgica-20220331_def.xml dgica-20220331_lab.xml dgica-20220331_pre.xml http://fasb.org/us-gaap/2021-01-31 http://xbrl.sec.gov/dei/2021q4 true true