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[Domain] Operating Activities [Axis] Operating Activities [Axis] Plan Name [Axis] Plan Name [Axis] Catastrophe Excess of Loss Catastrophe Excess of Loss [Member] Catastrophe Excess of Loss Debt Disclosure [Abstract] Debt Disclosure [Abstract] Related Party Transaction [Domain] Related Party Transaction [Domain] Premium Receivable, Credit Loss Expense (Reversal) Premium Receivable, Credit Loss Expense (Reversal) Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Statutory Net Income [Table] Statutory Net Income [Table] Statutory Net Income [Table] Earnings Per Share Earnings Per Share [Abstract] Subsequent Event Subsequent Event [Line Items] Common Stock, $0.0001 par value; 50,000,000 shares authorized; 43,525,249 and 43,360,429 issued; 43,313,166 and 43,370,442 outstanding, respectively Common Stock, Value, Issued Weighted Average Terms Weighted Average Terms [Line Items] [Line Items] for Weighted Average Terms [Table] Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months General and administrative expenses General and Administrative Expense Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Outstanding (Weight-Average Exercise) Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Trade Names Trade Names [Member] Schedule of Unrealized Loss on Investments Schedule of Unrealized Loss on Investments [Table Text Block] Discontinued Operations Discontinued Operations [Member] Investment Income, Net Net investment income Investment Income, Net Liability for Catastrophe Claims [Table] Liability for Catastrophe Claims [Table] Finance Lease, Principal Payments Finance Lease, Principal Payments Lease Liability Cash Activity Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Insurance Agency Management Fee Insurance Agency Management Fee Other Assets Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] Equity Securities Equity Securities [Member] Restricted Cash Restricted Cash Supplemental Cash Flows Information Supplemental Cash Flow Information [Abstract] Net premiums earned Premiums Earned, Net, Property and Casualty Premiums Earned, Net, Property and Casualty Accounting Standards Update [Axis] Accounting Standards Update [Axis] Amortization Amortization Other income Other Nonoperating Income (Expense) Filer Category Entity Filer Category Financing Receivable, Allowance for Credit Loss Financing Receivable, Allowance for Credit Loss Statement [Table] Statement [Table] Other Liabilities Other Liabilities Current Fiscal Year End Date Current Fiscal Year End Date Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Limited Partnership Limited Partner [Member] Accrued Sales Commission Accrued Sales Commission Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Preferred stock, authorized shares Preferred Stock, Shares Authorized Total investments Investments Granted (fair value) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Finite-Lived Intangible Asset, Expected Amortization, Year Five Finite-Lived Intangible Asset, Expected Amortization, Year Five Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] U.S. Government and Agency Securities US Treasury and Government [Member] Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Building Building [Member] Preferred stock, outstanding shares Preferred Stock, Shares Outstanding Finance Lease, Liability, to be Paid, Year Four Finance Lease, Liability, to be Paid, Year Four Asset-backed Securities Asset-Backed Securities [Member] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Exercisable Options, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Class of Stock [Axis] Class of Stock [Axis] Ceded uneared premiums Prepaid Reinsurance Premiums Prepaid Reinsurance Premiums Employee Employee [Member] Employee [Member] Payments to Acquire Other Investments Payments to Acquire Other Investments Other revenue Other Income Depreciation and amortization expense Depreciation, Depletion and Amortization Restricted Cash and Cash Equivalents Items Restricted Cash and Cash Equivalents Items [Line Items] Impact of Deconsolidation on OCI - Discontinued Operations. Impact of Deconsolidation on OCI - Discontinued Operations. Impact of Deconsolidation on OCI - Discontinued Operations. Reinsurance Recoverables Reinsurance Recoverables [Table Text Block] Reinsurance Recoverable [Table Text Block] Financing Lease Liability Activity [Axis] Financing Lease Liability Activity [Axis] Financing Lease Liability Activity [Axis] Interest rate (percentage) Debt Instrument, Interest Rate, Stated Percentage Effect of new accounting principle in period of adoption Effect of new accounting principle in period of adoption Increase (Decrease) Effect of new accounting principle in period of adoption Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Statutory capital and surplus balance Statutory Accounting Practices, Statutory Capital and Surplus, Balance Total Stockholders' Equity Stockholders' Equity Attributable to Parent Equity, Attributable to Parent Debt Securities, Available-for-Sale, Realized Gain Debt Securities, Available-for-Sale, Realized Gain Consolidation Items [Axis] Consolidation Items [Axis] Forfeited Options, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Intrinsic Value Goodwill, Impairment Loss Goodwill, Impairment Loss Restricted Stock Restricted Stock [Member] Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Valuation Allowance Schedule of Share-based Compensation, Activity Schedule of Weighted-Average Assumptions Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Cash and cash equivalents Cash, Cash Equivalents And Short-Term Investments [Member] Cash, Cash Equivalents And Short-Term Investments [Member] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Additional Licensed States Number of Additional States in which Entity is Licensed Number of Additional States in which Entity is Licensed Subsequent Events [Abstract] Subsequent Events [Abstract] Revision of Prior Period [Domain] Revision of Prior Period [Domain] Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Assets Held-in-trust Asset, Held-in-Trust Mutual Fund Mutual Fund [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Goodwill - Personal Lines Goodwill - Personal Lines Goodwill - Personal Lines Reinsurance Retention Policy Reinsurance Retention [Line Items] States, Municipalities and Political Subdivisions US States and Political Subdivisions Debt Securities [Member] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Regulatory Assets, Fair Value Disclosure Regulatory Assets, Fair Value Disclosure Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Preferred stock, issued shares Preferred Stock, Shares Issued Level 2 Fair Value, Inputs, Level 2 [Member] Current Year Claims and Claims Adjustment Expense Current Year Claims and Claims Adjustment Expense Entity Emerging Growth Company Entity Emerging Growth Company Fair value at sale Available-for-sale, Gross Realized Losses, Fair Value at Sale Available-for-sale, Gross Realized Losses, Fair Value at Sale Debt Issuance Costs, Net Debt Issuance Costs, Net Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Assets Held by Insurance Regulators Assets Held by Insurance Regulators Payments to Acquire Equity Securities, FV-NI Payments to Acquire Equity Securities, FV-NI Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Continuing Operations Continuing Operations [Member] Debt Instrument, Interest Rate, Effective Percentage Debt Instrument, Interest Rate, Effective Percentage Public Utilities Public Utilities [Member] Asset and mortgage backed securities Available-for-sale Securities, Debt Maturities, Without Single Maturity Date, Fair Value, Percent of Total Available-for-sale Securities, Debt Maturities, Without Single Maturity Date, Fair Value, Percent of Total Document Fiscal Period Focus Document Fiscal Period Focus Lessee, Operating Lease, Liability, to be Paid, Year One Lessee, Operating Lease, Liability, to be Paid, Year One Deferred policy acquisition costs, net Increase (Decrease) in Deferred Policy Acquisition Costs Lessee, Operating Lease, Liability, to be Paid, Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four Operating Lease, Expense Operating Lease, Expense Stock based compensation Share-Based Payment Arrangement, Noncash Expense Schedule of Investments in Limited Partnerships Other Investments Not Readily Marketable [Table Text Block] Common Stock Common Stock [Member] Proceeds from Income Tax Refunds Proceeds from Income Tax Refunds Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Gain on Building Disposal Gain on Building Disposal Gain on Building Disposal Earnings Per Share Earnings Per Share [Text Block] Schedule of Nonvested Share Activity Schedule of Nonvested Share Activity [Table Text Block] Losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Net, Property, Casualty and Liability Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Equity, Including Portion Attributable to Noncontrolling Interest Investments, at fair value: Investments [Abstract] Minimum Minimum [Member] Denominator Weighted Average Number of Shares Outstanding, Diluted [Abstract] Property and equipment, net Property, Plant and Equipment, Net Property, Plant and Equipment, Net Underwriting Expense Ratio Underwriting Expense Ratio Schedule of Acquired Finite-Lived Intangible Assets by Major Class Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Dividends, Common Stock, Cash Aggregate amount of dividends Dividends, Common Stock, Cash ASSETS Assets [Abstract] Statutory Net Income [Line Items] Statutory Net Income [Line Items] Statutory Net Income [Line Items] Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Weighted-average shares outstanding Weighted Average Number of Shares Outstanding, Basic and Diluted [Abstract] Weighted Average Number of Shares Outstanding, Basic and Diluted [Abstract] Reinsurance Contract [Domain] Reinsurance Contract [Domain] Reinsurance Contract AmRisc Fees and Commission AmRisc Fees and Commission [Member] AmRisc Fees and Commission [Member] Liabilities Liabilities [Abstract] Debt Issuance Costs, Gross Debt Issuance Costs, Gross Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Property, Plant and Equipment, Disposals Property, Plant and Equipment, Disposals Liability for unpaid losses and loss adjustment expenses Short-Duration Insurance and Deposit Contracts [Text Block] Lease Costs Lessee, Lease, Description Lessee, Lease, Description [Line Items] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Redeemable Preferred Stocks Redeemable Preferred Stock [Member] Retained Earnings Retained Earnings [Member] Bond amortization and accretion Accretion (Amortization) of Discounts and Premiums, Investments Total Liabilities and Stockholders' Equity Liabilities and Equity Exercisable (Weighted-Average Exercise) Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price Fixed maturities, cost Cost or adjusted/amortized cost Debt Securities, Available-for-Sale, Amortized Cost Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Basic earnings per share Earnings Per Share, Basic Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Allowance for Credit Losses Allowance for Credit Losses [Text Block] Accounting Policies [Abstract] Accounting Policies [Abstract] Credit Loss Allowance Activity Credit Loss Allowance Activity [Line Items] [Line Items] for Credit Loss Allowance Activity [Table] Gain (Loss) on Disposition of Assets Gain (Loss) on Disposition of Assets Public Utilities Public Utility, Bonds [Member] Exercised Options, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Impact of Deconsolidation of Discontinued Operations Impact of Deconsolidation of Discontinued Operations Impact of Deconsolidation of Discontinued Operations Premium Receivable, Allowance for Credit Loss Premium Receivable, Allowance for Credit Loss Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Reinsurance recoverable on paid and unpaid losses Increase (Decrease) in Reinsurance Recoverable Investment expenses Investment Income, Investment Expense Entity Address, City or Town Entity Address, City or Town Restrictions on Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Gross premiums earned Gross premiums earned Gross Premiums Earned, Property and Casualty This amount represents premiums earned from direct customers and premiums earned on policies assumed from other insurance entities. Asset and mortgage backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Vested weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Income taxes paid Income Taxes Paid Nonredeemable Preferred Stocks Nonredeemable Preferred Stock [Member] Contingent restricted stock shares issued Contingent restricted stock shares issued Contingent restricted stock shares issued Reinsurance recoverable, allowance for credit loss, writeoff Reinsurance recoverable, allowance for credit loss, writeoff Reinsurance recoverable, allowance for credit loss, writeoff Aggregate Retention Level Aggregate Retention Level Aggregate Retention Level Software in progress Software in progress Software in progress Document Transition Report Document Transition Report Accounts Payable Increase (Decrease) in Accounts Payable Change in Accounting Principle, Type [Domain] Change in Accounting Principle, Type [Domain] Common stock, authorized shares Common Stock, Shares Authorized Operating Leases, Income Statement, Sublease Revenue Operating Leases, Income Statement, Sublease Revenue Fixed maturities (amortized cost of $559,163 and $672,139 Fair Value Total Debt Securities, Available-for-Sale Return of capital - Noncontrolling interest Return of capital - Noncontrolling interest Return of capital - Noncontrolling interest Gain on sale of building Gain on sale of building Gain on sale of building Investment Income Investment Income [Table Text Block] Equity Securities, FV-NI, Realized Gain Equity Securities, FV-NI, Realized Gain Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Unrealized Gain Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Short-term Investments Short-Term Investments [Member] Lease Assets and Liabilities Lease Assets and Liabilities [Table Text Block] Lease Assets and Liabilities [Table Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Adjustments to reconcile net income to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Reinsurance, Excess Retention, Amount Reinsured, Per Policy Reinsurance, Excess Retention, Amount Reinsured, Per Policy Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity Share-Based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block] Title of Individual [Domain] Title of Individual [Domain] Other Investments Partnership Interest [Member] Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 150M Senior Notes 150M Senior Notes [Member] 150M Senior Notes [Member] Reinsurance Event, Type [Domain] Reinsurance Event, Type [Domain] Reinsurance Event, Type [Domain] Gain (Loss) on Investments Gain (Loss) on Investments Provision for uncollectable premiums/over and short Accounts Receivable, Credit Loss Expense (Reversal) Additional Paid in Capital Additional Paid in Capital Premium Receivable, Allowance for Credit Loss, Writeoff Premium Receivable, Allowance for Credit Loss, Writeoff Less: Forfeited shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Less: Forfeited (fair value) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value CARES Act Deferred Tax Asset Impact CARES Act Deferred Tax Asset Impact CARES Act Deferred Tax Asset Impact Stock Issued During Period, Value, Restricted Stock Award, Gross Stock Issued During Period, Value, Restricted Stock Award, Gross Subsequent Event Type [Axis] Subsequent Event Type [Axis] Proceeds from Contributions from Parent Proceeds from Contributions from Parent Share-based Payment Arrangement, Option, Exercise Price Range [Table] Share-Based Payment Arrangement, Option, Exercise Price Range [Table] Accumulated Depreciation, Buildings Disposed of Accumulated Depreciation, Buildings Disposed of Accumulated Depreciation, Buildings Disposed of Gross premiums written Premiums Written, Gross Finance Lease, Liability Finance Lease, Liability Financing Lease Liability Activity [Abstract] Financing Lease Liability Activity [Abstract] Financing Lease Liability Activity [Abstract] Total Lease Future Payments Total Lease Future Payments Total Lease Future Payments Income Taxes Income Tax, Policy [Policy Text Block] Finite-Lived Intangible Asset, Expected Amortization, Year Four Finite-Lived Intangible Asset, Expected Amortization, Year Three Gain on Leased Vehicle Disposal Gain on Leased Vehicle Disposal Gain on Leased Vehicle Disposal Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Schedule of Intangible Assets and Goodwill Schedule of Intangible Assets and Goodwill [Table Text Block] Acccumulated Depreciation on disposed systems Accumulated Depreciation on disposed systems Accumulated Depreciation on disposed systems Related Party [Axis] Related Party, Type [Axis] Total Credit Loss Allowances Total Credit Loss Allowances Total Credit Loss Allowances Proceeds from Divestiture of Businesses, Net of Cash Divested Proceeds from Divestiture of Businesses, Net of Cash Divested Outstanding Options, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Other assets, net Other Assets Personal Lines Reporting Segment Personal Lines Reporting Segment [Member] Personal Lines Reporting Segment Registrant Name Entity Registrant Name Other assets Increase (Decrease) in Other Operating Assets Non-Vested Common Stock Grants [Abstract] Non-Vested Common Stock Grants [Abstract] Non-Vested Common Stock Grants [Abstract] Finite-Lived Intangible Asset, Expected Amortization, Year Three Finite-Lived Intangible Asset, Expected Amortization, Year Two Twelve Months or More Available For Sale Securities Continuous Unrealized Loss Position Twelve Months or More [Abstract] Available For Sale Securities Continuous Unrealized Loss Position Twelve Months or More [Abstract] Due after five years through ten years Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis, Percent of Total Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis, Percent of Total Proceeds from Sale of Property, Plant, and Equipment Proceeds from Sale of Property, Plant, and Equipment Stockholders' Equity Attributable to Noncontrolling Interest Equity, Attributable to Noncontrolling Interest Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Lease Costs [Domain] Lease Costs [Domain] [Domain] for Lease Costs [Axis] Document Period End Date Document Period End Date Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Less: Accumulated Depreciation and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Credit Loss [Abstract] Credit Loss [Abstract] Payments outstanding Payments outstanding Payments outstanding Repayments of borrowings Repayments of Long-term Debt Repayments of Long-Term Debt Finance Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Treasury Stock, Common Treasury Stock, Common [Member] Central Index Key Entity Central Index Key Loss Contingency Accrual Loss Contingency Accrual Weighted Average Lease Terms [Domain] Weighted Average Lease Terms [Domain] [Domain] for Weighted Average Lease Terms [Axis] Segment Reporting Information Segment Reporting Information [Line Items] Gain (Loss) on Disposition of Property Plant Equipment Gain (Loss) on Disposition of Property Plant Equipment Pre-Tax Expense Share-Based Payment Arrangement, Expense Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Provision for income taxes Income Tax Expense (Benefit) Finance Lease, Right-of-Use Asset, after Accumulated Amortization Finance Lease, Right-of-Use Asset, after Accumulated Amortization Vesting [Axis] Vesting [Axis] Financing Receivable, Allowance for Credit Loss, Writeoff Financing Receivable, Allowance for Credit Loss, Writeoff Unpaid losses and loss adjustment expenses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Impact of deconsolidation of former entity, pre-tax Impact of deconsolidation of former entity, pre-tax Impact of deconsolidation of former entity, pre-tax Number of Operating Segments Number of Operating Segments Financing Receivable, Credit Loss, Expense (Reversal) Financing Receivable, Credit Loss, Expense (Reversal) Catastrophe Event Type [Domain] Catastrophe Event Type [Domain] [Domain] for Catastrophe Event Type [Axis] Award Date [Axis] Award Date [Axis] First Event Retention Level First Event Retention Level First Event Retention Level Operating Costs and Expenses Operating Costs and Expenses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Schedule of Available-for-sale Securities Debt Securities, Available-for-Sale [Line Items] Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Impact of deconsolidation of former entity, tax impact Impact of deconsolidation of former entity, tax impact Impact of deconsolidation of former entity, tax impact Financing Lease Liability Activity Financing Lease Liability Activity [Line Items] [Line Items] for Financing Lease Liability Activity [Table] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Net fair value at sale Available-for-sale, Gross Realized Gains (Losses), Fair Value at Sale Available-for-sale, Gross Realized Gains (Losses), Fair Value at Sale Due after five years through ten years Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value, Percent of Total Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value, Percent of Total Credit Loss Change, Available-for-Sale Investments Debt Securities, Held-to-Maturity, Transfer in, Allowance for Credit Loss, Expense Reclassification adjustment for net realized investment (gains) losses Reclassification adjustment for net realized investment (gains) losses Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Deferred income taxes, net Increase (Decrease) in Deferred Income Taxes Receivable from sale of building Receivable from sale of building Receivable from sale of building Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Cash and Cash Equivalents Cash and Cash Equivalents, at Carrying Value Percent of Total Available For Sale Securities Debt Maturities Single Maturity Date Fair Value Percent of Total [Abstract] Available For Sale Securities Debt Maturities Single Maturity Date Fair Value Percent of Total [Abstract] Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Interest Paid Interest Paid, Excluding Capitalized Interest, Operating Activities Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Granted Options, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One American Coastal Insurance Company American Coastal Insurance Company [Member] American Coastal Insurance Company Liability for Unpaid Claims and Claims Adjustment Expense Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Total Available-for-sale Securities, Fair Value Disclosure, Percent of Total Available-for-sale Securities, Fair Value Disclosure, Percent of Total Number of Wholly Owned Subsidiaries Number of Wholly-Owned Subsidiaries Number of Wholly-Owned Subsidiaries Interboro Insurance Interboro Insurance [Member] Interboro Insurance Reinsurance Event, Type [Axis] Reinsurance Event, Type [Axis] Reinsurance Event, Type [Axis] Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Weighted Average Remaining Lease Term Leasehold Improvements Leasehold Improvements [Member] Weighted-average diluted shares Weighted-average diluted shares Weighted Average Number of Shares Outstanding, Diluted Reinsurance Recoverable for Paid Claims and Claims Adjustments Reinsurance Recoverable for Paid Claims and Claims Adjustments Policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Total Lease Liability Undiscounted Excess Amount Total Lease Liability Undiscounted Excess Amount Total Lease Liability Undiscounted Excess Amount Percent of Total Equity securities, FV-NI Percent of Total Equity securities, FV-NI Percent of Total Debt Securities, Available-for-Sale, Realized Gain (Loss) Debt Securities, Available-for-Sale, Realized Gain (Loss) UPC Insurance UPC Insurance [Member] UPC Insurance Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Disposal Groups, Assets & Liabilities Disposal Groups, Including Discontinued Operations [Table Text Block] Finance Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability, Undiscounted Excess Amount Debt Securities, Available-for-Sale, Realized Loss Debt Securities, Available-for-Sale, Realized Loss Cost of property, equipment and capitalized software acquired Payments to Acquire Property, Plant, and Equipment Additional Paid-in Capital Additional Paid-in Capital [Member] Proceeds from Sale of Equity Securities, FV-NI Proceeds from Sale of Equity Securities, FV-NI Share-based Payment Arrangement, Option, Exercise Price Range Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items] Vehicles Vehicles [Member] Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Total Assets Assets Assets Corporate Securities Other Corporate Bonds [Member] Finance Lease, Liability, to be Paid, after Year Five Finance Lease, Liability, to be Paid, after Year Five Total Lease Liability Total Lease Liability Total Lease Liability Revision of Prior Period [Axis] Revision of Prior Period [Axis] Number of States in which Entity Operates Number of States in which Entity Operates Premiums receivable, net (credit allowance of $28 and $32) Premiums Receivable, Net Exercisable weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Subsequent Events Subsequent Events [Text Block] Building Disposal Building Disposal Building Disposal Ceded premiums earned Ceded Premiums Earned Ceded Premiums Earned Statutory net income (loss) Statutory Accounting Practices, Statutory Net Income Amount Lease Costs [Axis] Lease Costs [Axis] Lease Costs [Axis] Reinsurance Contract, Counterparty Name [Axis] Reinsurance Contract, Counterparty Name [Axis] Reinsurance Contract, Counterparty Name [Axis] Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Payments of Dividends Payments of Dividends Payments of Dividends Less: Vested (fair value) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Operating Leases, Future Minimum Payments Due Lessee, Operating Lease, Liability, to be Paid Due in one year or less Available-for-sale Securities, Debt Maturities, within One Year, Fair Value, Percent of Total Available-for-sale Securities, Debt Maturities, within One Year, Fair Value, Percent of Total Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments (credit allowance of $552 and $563) Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Right-of-Use Asset, Amortization Segment Reporting Disclosure Segment Reporting Disclosure [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Foreign Government Debt Security, Government, Non-US [Member] FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Equity Component [Domain] Equity Component [Domain] Other Comprehensive Income (Loss), NCI Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Reinsurance Recoverable [Table] Reinsurance Recoverable [Table] Reinsurance Recoverable [Table] Other Long-term Investments Other Long-Term Investments [Member] Debt Instrument Debt Instrument [Line Items] Weighted-average shares outstanding Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Credit Loss Allowance Activity [Table] Credit Loss Allowance Activity [Table Text Block] Credit Loss Allowance Activity [Table] Income (loss) before other income Operating Income (Loss) Operating Income (Loss) Accumulated Depreciation on Building Disposal Accumulated Depreciation on Building Disposal Accumulated Depreciation on Building Disposal AmRisc ceded premiums written AmRisc ceded premiums written [Member] AmRisc ceded premiums written [Member] Reinsurance Disclosures [Abstract] Reinsurance Disclosures [Abstract] Weighted Average Lease Terms [Abstract] Weighted Average Lease Terms [Abstract] Weighted Average Lease Terms [Abstract] Office Equipment Office Equipment [Member] REVENUE: Revenues [Abstract] Consolidated Entities [Domain] Consolidated Entities [Domain] Commercial Lines Reporting Segment Commercial Lines Reporting Segment [Member] Commercial Lines Reporting Segment Catastrophic Event [Domain] Catastrophic Event [Domain] Fair value at sale Available-for-sale, Gross Realized Gains, Fair Value at Sale Available-for-sale, Gross Realized Gains, Fair Value at Sale Change in Operating Lease Liability Change in Operating Lease Liability Change in Operating Lease Liability Weighted Average Lease Terms Weighted Average Lease Terms [Table Text Block] Weighted Average Lease Terms Less Than Twelve Months Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months [Abstract] Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months [Abstract] Error Correction, Type [Domain] Error Correction, Type [Domain] Third Event Retention Level Third Event Retention Level Third Event Retention Level Related Party Transaction [Axis] Related Party Transaction [Axis] Segments [Axis] Segments [Axis] Statement [Line Items] Statement [Line Items] Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value, Percent of Total Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value, Percent of Total OTHER COMPREHENSIVE INCOME: Other Comprehensive Income (Loss), Net of Tax [Abstract] Vested Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Reinsurance payable Increase (Decrease) in Reinsurance Payables Mortgage-backed securities Collateralized Mortgage-Backed Securities [Member] Debt Issuance Cost Rollforward Schedule of Debt [Table Text Block] Customer Relationships Customer Relationships [Member] Contingent Restricted Shares Contingent Restricted Shares Contingent Restricted Shares Noncontrolling Interest Noncontrolling Interest [Member] Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent