Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Maximum [Member] Maximum [Member] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Premiums earned - ceded Ceded Premiums Earned Title of 12(b) Security Title of 12(b) Security Reported Value Measurement Reported Value Measurement [Member] Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Document Fiscal Year Focus Document Fiscal Year Focus Underwriting, Acquisition and Insurance Expenses [Abstract] Underwriting, Acquisition and Insurance Expenses [Abstract] Underwriting, Acquisition and Insurance Expenses [Abstract] Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Nonvested Restricted Stock, Number of Shares [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract] Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Common stock, $0.01 par value, 400,000,000 shares authorized, 23,500,708 and 22,509,945 shares issued and outstanding at September 30, 2026; 23,380,413 and 23,145,751 shares issued and outstanding at December 31, 2025 Common Stock, Value, Issued Payroll taxes withheld and remitted on share-based payments Payment, Tax Withholding, Share-Based Payment Arrangement Line of Credit Line of Credit [Member] Underwriting, acquisition and insurance expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Restatement Determination Date Restatement Determination Date Payable to reinsurers Reinsurance Payable Measurement Frequency [Axis] Measurement Frequency [Axis] Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Period Increase (Decrease) Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Period Increase (Decrease) U.S. Treasury securities and obligations of U.S. government agencies US Treasury and Government [Member] Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Real Estate Investment Property, Accumulated Depreciation Real Estate Investment Property, Accumulated Depreciation Net investment income Net investment income Net Investment Income Net commissions incurred Net commissions incurred Gross commissions incurred less ceding commissions. Gross Unrealized Holding Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Asset-backed securities Asset-backed securities [Member] Asset-Backed Securities [Member] Investments [Domain] Investments [Domain] Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Debt Instrument, Maturity Date Debt Instrument, Maturity Date Less reclassification adjustment [Abstract] OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Total Gross Unrealized Holding Losses Gross Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Granted, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Purchases - equity securities Payments to Acquire Equity Securities, FV-NI Investment in Real Estate - Furniture and Fixtures Investment in Real Estate - Furniture and Fixtures Investment in Real Estate - Furniture and Fixtures PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Catastrophic Event [Domain] Catastrophic Event [Domain] Debt Instrument, Covenant Description Debt Instrument, Covenant Description Nonvested outstanding at the beginning of the period, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Basic Weighted average shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Premiums earned - direct Direct Premiums Earned Number of Reportable Segments Number of Reportable Segments Short-duration Insurance Contracts, Claims Development [Table] Short-Duration Insurance Contracts, Claims Development [Table] Debt Securities, Available-for-Sale, Allowance for Credit Loss Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block] Real Estate Investment Property, at Cost Real Estate Investment Property, at Cost Investments [Abstract] Investments [Abstract] Due after five years through ten years, Estimated Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Fixed-maturity securities, available for sale, amortized cost Total fixed maturities, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Entity Address, City or Town Entity Address, City or Town Granted, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Direct commissions deferred Direct commissions deferred Deferred policy acquisition costs related to fees paid to an agent or broker for placing insurance, generally determined as a percentage of the written premium. Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Claims Development [Line Items] Claims Development [Line Items] Other expenses Other Expenses Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Investment Income, Investment Expense Investment Income, Investment Expense Investment Income [Table] Investment Income [Table] Treasury Stock, Value Treasury Stock, Value Current period change for estimated uncollectible premiums Premium Receivable, Credit Loss Expense (Reversal) New Accounting Pronouncements, Policy New Accounting Pronouncements, Policy [Policy Text Block] Segment Reporting Segment Reporting [Table Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Change in net unrealized losses on available-for-sale investments, net of taxes Other comprehensive income (loss), net of tax Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Repayments of Lines of Credit Repayments of Lines of Credit Debt Long-Term Debt Short-duration Insurance Contracts, Accident Year [Domain] Short-Duration Insurance Contracts, Accident Year [Domain] Property and Equipment Disclosure [Text Block] Property, Plant, and Equipment [Text Block] Due after one year through five years, Estimated Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Document Period End Date Document Period End Date Other operating expenses Other Underwriting Expense Underwriting, acquisition and insurance expenses Underwriting, acquisition, and insurance expenses Underwriting, acquisition, and insurance expenses Costs incurred during the period related to selling the Company's products and services including the amortization of deferred policy acquisition costs charged to expense in the period, as well as other costs incurred during the period, such as those relating to general administration and policy maintenance. Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Debt Instrument, Face Amount Debt Instrument, Face Amount Earnings Per Share, Basic [Abstract] Earnings Per Share, Basic [Abstract] Investment in Real Estate - Land improvements Investment in Real Estate - Land improvements Investment in Real Estate - Land improvements Security Exchange Name Security Exchange Name Realized losses, fixed-maturity securities Debt Securities, Available-for-Sale, Realized Loss Income tax benefit (expense) OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Weighted average exercise price, granted Granted Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Gross written premiums Premiums Written, Gross Reversal of prior-period (gains) losses on equity securities sold [Line Items] Reversal of prior-period (gains) losses on equity securities sold Reversal of prior-period (gains) losses on equity securities sold Due after ten years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Fair value of restricted stock awards vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Liabilities measured at fair value Liabilities, Fair Value Disclosure Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Number of shares available for issuance Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized 12 Months or Longer, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Property and Equipment Property, Plant, and Equipment [Table Text Block] Schedule of Real Estate Properties Schedule of Real Estate Properties [Table Text Block] Interest Income (Expense), Net [Abstract] Interest Income (Expense), Operating [Abstract] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Income tax benefit (expense) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Earnings per share: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Ceding commissions deferred Ceding commissions deferred Deferred policy acquisition costs related to commissions paid by the reinsurer to the insurer (the company) on reinsurance agreements as compensation to place business with the reinsurer and to cover the insurer's acquisition costs. Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Fixed-maturity securities, available for sale, at fair value (amortized cost: $4,736,687, allowance for credit losses: $55 – 2026; $4,382,725 and $29 – 2025) Estimated Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Intangible assets Intangible Asset, Excluding Goodwill, Indefinite-Lived Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Weighted Average Number of Shares Outstanding, Basic [Abstract] Weighted Average Number of Shares Outstanding, Basic [Abstract] Company Selected Measure Name Company Selected Measure Name Change in net unrealized gains (losses) on fixed-maturity securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment and Tax Purchases – fixed-maturity securities Payments to Acquire Debt Securities, Available-for-Sale Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] 2025 Omnibus Incentive Plan 2025 Omnibus Incentive Plan [Member] 2025 Omnibus Incentive Plan Earnings Per Share, Diluted [Abstract] Earnings Per Share, Diluted [Abstract] Equity securities - cost Equity Securities, FV-NI, Cost Line of Credit Facility, Commitment Fee Percentage Line of Credit Facility, Commitment Fee Percentage Total fixed maturities Fixed maturities [Member] Debt Securities [Member] Depreciation, Depletion and Amortization, Nonproduction Depreciation, Depletion and Amortization, Nonproduction Reserves for unpaid losses and loss adjustment expenses Gross reserves for unpaid losses and loss adjustment expenses, beginning of year Gross reserves for unpaid losses and loss adjustment expenses, end of period Liability for Claims and Claims Adjustment Expense Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted Weighted average shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Credit Loss [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Net Investment Income Investment Income [Table Text Block] Proceeds from Lines of Credit Proceeds from Lines of Credit Change in allowance for credit losses on investments, before income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Allowance for Credit Losses, before Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Allowance for Credit Losses, before Tax Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Current Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity Land Improvements Land Improvements [Member] Investment income due and accrued Accrued Investment Income Receivable Without single maturity date, Amortized Cost Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost 2034 Series A Notes 2034 Series A Notes [Member] 2034 Series A Notes Award Timing Predetermined Award Timing Predetermined [Flag] Treasury Stock, Common Treasury Stock, Common [Member] Comprehensive Income (Loss) Comprehensive Income (Loss) [Table Text Block] Intrinsic value of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Net Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Net reserves for unpaid losses and loss adjustment expenses, beginning of year Net reserves for unpaid losses and loss adjustment expenses, end of period Liability for Unpaid Claims and Claims Adjustment Expense, Net Software, Internally Developed Software, Internally Developed [Member] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Dilutive effect of shares issued under stock compensation arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Nonvested outstanding at the beginning of the period Nonvested outstanding at the end of the period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Residential mortgage-backed securities Residential mortgage-backed securities [Member] Residential Mortgage-Backed Securities [Member] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Long-Term Debt, Fair Value Long-Term Debt, Fair Value Ceded incurred losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Ceded Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Outstanding beginning of period Outstanding end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Purchase of real estate investment Payments to Acquire Real Estate and Real Estate Joint Ventures Payments: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Table Text Block] Due in one year or less, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Reinsurance recoverables, net Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Policy acquisition costs deferred Deferred Policy Acquisition Cost, Capitalization Realized gains from the sales of short-term investments and cash equivalents SalesOfShort-termAndOtherSecuritiesNetRealizedGains(Losses) This item represents net gains (losses) realized on the sales of other short-term securities Segment Reporting Segment Reporting [Text Block] Investments Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Maturities and calls – fixed-maturity securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Credit facility Long-Term Line of Credit Minimum [Member] Minimum [Member] Investment Type [Axis] Investment Type [Axis] Dividends paid Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Fair value Investments, Fair Value Disclosure Liabilities Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Cash and Cash Equivalents, Fair Value Disclosure Cash and Cash Equivalents, Fair Value Disclosure Change in fair value of equity securities held at the end of the period Change in fair value of equity securities held at the end of the period Change in fair value of equity securities held at the end of the period Outstanding, weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted-Average Remaining Contractual Term Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Building Building [Member] Schedule of Real Estate Properties [Table] Real Estate Property, Ownership [Table] Other liabilities Other Liabilities Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Credit Facility Accordion Feature CreditFacilityAccordionFeature Credit Facility Accordion Feature Realized gains, fixed-maturity securities Debt Securities, Available-for-Sale, Realized Gain Due after ten years, Estimated Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Recurring Fair Value, Recurring [Member] Investment in Real Estate - Parking Deck Investment in Real Estate - Parking Deck Investment in Real Estate - Parking Deck Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Segments [Domain] Segments [Domain] Obligations of states, municipalities and political subdivisions Obligations of states, municipalities and political subdivisions [Member] US States and Political Subdivisions Debt Securities [Member] Sales – fixed-maturity securities Proceeds from Sale of Debt Securities, Available-for-Sale Debt Debt Disclosure [Text Block] Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Debt Issuance Costs, Net Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Deferred policy acquisition costs, net of ceding commissions Balance, beginning of period Balance, end of period Deferred Policy Acquisition Cost PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Estimated Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Adoption Date Trading Arrangement Adoption Date Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Dividends declared Dividends, Common Stock, Cash Premium Receivable, Allowance for Credit Loss Beginning Balance Ending Balance Premium Receivable, Allowance for Credit Loss Total stockholders’ equity Balance Balance Equity, Attributable to Parent Equity securities, at fair value (cost: $625,689 – 2026; $482,926 – 2025) Equity Securities, FV-NI, Current Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Premiums written - direct Direct Premiums Written Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Ceding commissions Ceding commissions Ceding commissions are commissions earned on business ceded by the Company to reinsurers. Nonrecurring [Member] Fair Value, Nonrecurring [Member] Insider Trading Policies and Procedures [Line Items] Outstanding beginning of period, shares Outstanding end of period, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Taxable bonds Interest Income, Securities, Operating, Taxable Other underwriting and policy acquisition costs Other underwriting and policy acquisition costs deferred Other underwriting costs representing incremental direct costs related to the successful issuance or renewal of an insurance policy. Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Selling, General and Administrative Expense Selling, General and Administrative Expense Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Total net losses and loss adjustment expenses incurred Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Commitments and Contingencies Disclosure Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Antidilutive securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Central Index Key Entity Central Index Key Premiums Written, Net [Abstract] Premiums Written, Net [Abstract] Accumulated Depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization All Adjustments to Compensation All Adjustments to Compensation [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Legal Matters and Contingencies Legal Matters and Contingencies [Text Block] Prior years Adverse (Favorable) development on prior year loss reserves Prior Year Claims and Claims Adjustment Expense Cash equivalents and short-term investments Interest Income, Deposits with Financial Institutions Income Statement [Abstract] Income Statement [Abstract] Stockholders' Equity Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Net realized investment gains (losses) Gain (Loss) on Investments Debt Instrument, Issuance Date Debt Instrument, Issuance Date Expenses: Operating Expenses [Abstract] Deferred Income Tax Assets, Net Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Short Duration Insurance Contract Accident Years 2020 through 2024 Short Duration Insurance Contract Accident Years 2020 through 2024 [Member] Short Duration Insurance Contract Accident Years 2020 through 2024 Investment Building and Building Improvements Investment Building and Building Improvements Effects of Reinsurance Effects of Reinsurance [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] City Area Code City Area Code Short-duration Insurance Contracts, Accident Year [Axis] Short-Duration Insurance Contracts, Accident Year [Axis] Restricted stock [Member] Restricted Stock [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Name Forgone Recovery, Individual Name Realized Gain (Loss) on Investments Realized Gain (Loss) on Investments [Table Text Block] Compensation cost not yet recognized, period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Nonvested Restricted Stock, Weighted Average Grant Date Fair Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Statement [Line Items] Statement [Line Items] Total assets Assets Write-offs of uncollectible premiums receivable Premium Receivable, Allowance for Credit Loss, Writeoff Net realized gains from equity securities Equity Securities, FV-NI, Realized Gain (Loss) Debt Instrument, Date of First Required Payment Debt Instrument, Date of First Required Payment Operating Segments Operating Segments [Member] Weighted average grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Net realized (losses) gains on fixed-maturity securities, before income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Reduction from securities sold during the period Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Sold Gross Unrealized Holding Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Stock-based Compensation Share-Based Payment Arrangement [Text Block] Change in short-term investments, net Payments for (Proceeds from) Short-Term Investments Without single maturity date, Estimated Fair Value Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Property and Equipment [Abstract] Property and Equipment [Abstract] Property and Equipment [Abstract] PEO PEO [Member] Credit Loss, Financial Instrument Credit Loss, Financial Instrument [Text Block] Share-based compensation expense Share-Based Payment Arrangement, Expense Number of available-for-sale securities in unrealized loss positions, greater than one year Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Measurement Basis [Axis] Measurement Basis [Axis] Realized losses, equity securities Equity Securities, FV-NI, Realized Loss Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Exercised, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Number of available-for-sale securities in unrealized loss positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Total investments Investments Unrealized (losses) gains on fixed-maturity securities arising during the period, before income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Weighted average grant date fair value Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Due in one year or less, Estimated Fair Value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Retained Earnings [Member] Retained Earnings [Member] Weighted Average Interest Rate Long-Term Debt, Weighted Average Interest Rate, over Time Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Forfeited, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Unrealized (losses) gains arising during the period, net of income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Balance, shares Balance, shares Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Corporate and other securities Corporate and other securities [Member] Corporate Debt Securities [Member] Diluted Earnings per share - diluted Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Restricted shares withheld for taxes Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Real Estate Investment Real Estate Investment [Member] Net written premiums Premiums Written, Net Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Income tax benefit (expense) Reclassification from AOCI, Current Period, Tax Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Net Investment Income [Line Items] Net Investment Income [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Ceded unearned premiums Prepaid Reinsurance Premiums Exercisable, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Other income Other Income Net increase (decrease) from securities that had an allowance at the beginning of the period Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) Short Duration Insurance Contract Accident Years 2021 through 2025 Short Duration Insurance Contract Accident Years 2021 through 2025 [Member] Short Duration Insurance Contract Accident Years 2021 through 2025 Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Estimate of Fair Value Measurement Estimate of Fair Value Measurement [Member] Increase to allowance from securities for which credit losses were not previously recorded Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded Forfeited Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Deferred Policy Acquisition Costs Disclosures [Abstract] Deferred Policy Acquisition Costs Disclosures [Abstract] Construction in Progress Construction in Progress [Member] Debt Instrument, Periodic Payment, Principal Debt Instrument, Periodic Payment, Principal Restricted Stock Activity Nonvested Restricted Stock Shares Activity [Table Text Block] Premiums and fees receivable, net of allowance for credit losses of $31,779 – 2026; $27,328 – 2025 Premiums and Other Receivables, Net Segment Reporting [Table] Segment Reporting [Table] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Available-for-sale Investments Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Less than 12 Months, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Dividends on equity securities Investment Income, Dividend Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Schedule of Earnings Per Share [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Dividends declared, per share Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Issuance of common stock under stock-based compensation plan Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Contractual Maturities of Available-for-sale Fixed Maturity Securities Investments Classified by Contractual Maturity Date [Table Text Block] Equity securities [Member] Equity Securities [Member] Schedule of Unpaid Losses and Loss Adjustment Expenses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Stock Options Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Development in Process Development in Process Treasury Stock, Common, Shares Treasury Stock, Common, Shares Net earned premiums Premiums Earned, Net Premiums Earned, Net Tax exempt municipal bonds Interest Income, Securities, Operating, Tax Exempt 12 Months or Longer, Gross Unrealized Holding Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Change in unearned premiums (Increase) Decrease in Unearned Premiums, Net Equity Components [Axis] Equity Components [Axis] Entity Interactive Data Current Entity Interactive Data Current Catastrophe losses [Member] Catastrophe [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Due after one year through five years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Reclassification adjustment included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Entity Small Business Entity Small Business Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unearned premiums Unearned Premiums Termination Date Trading Arrangement Termination Date Restricted shares withheld for taxes (shares) Restricted shares withheld for taxes (shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Realized gains, equity securities Equity Securities, FV-NI, Realized Gain Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Current year Current year Current Year Claims and Claims Adjustment Expense Contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Financing Activities Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Gross commissions Insurance Commissions Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Available-for-sale Securities in an Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Allowance for Credit Losses Beginning balance Ending balance Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Exercisable, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Fee income Insurance Fee Income Policy fees charged to insureds Short-term investments Other Short-Term Investments Less than 12 months, gross unrealized holding losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Reinsurance Recoverable, Allowance for Credit Loss Reinsurance Recoverable, Allowance for Credit Loss Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Maturity Date Line of Credit Facility, Expiration Date Total revenues Revenues Revenues Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Furniture and Fixtures Furniture and Fixtures [Member] Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Reinsurance Reinsurance [Text Block] Exercisable, weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted-Average Remaining Contractual Term Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities PEO Name PEO Name Total payments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Real Estate Investments, Net Real Estate Investments, Net Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Other assets Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Interest Expense Interest Expense, Debt Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Exercised Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Reinsurance recoverables on paid losses Reinsurance Recoverables on Paid Losses, Gross Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Policy acquisition costs deferred: Policy acquisition costs deferred: [Abstract] Policy acquisition costs deferred: [Abstract] Interest Rate Description Line of Credit Facility, Interest Rate Description Salaries, bonuses and employee benefits Labor and Related Expense Land Land Schedule of Debt Schedule of Debt [Table Text Block] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Due after five years through ten years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Basic Earnings per share - basic Earnings Per Share, Basic Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Nonredeemable preferred stock [Member] Nonredeemable Preferred Stock [Member] Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Excess and Surplus Lines Segment Excess and Surplus Lines Segment [Member] Excess and Surplus Lines Segment Retained earnings Retained Earnings (Accumulated Deficit) Amortization of net policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock [Member] Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] 2034 Series B Notes 2034 Series B Notes [Member] 2034 Series B Notes Debt Securities Available For Sale Allowance For Credit Loss Number Of Securities Debt Securities Available For Sale Allowance For Credit Loss Number Of Securities Number of debt securities in which there is an allowance for credit losses. Equity Awards Adjustments Equity Awards Adjustments [Member] Net realized (losses) gains from fixed-maturity securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Total liabilities and stockholders’ equity Liabilities and Equity Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Text Block] Earnings Per Share, [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Net realized investment gains (losses) Realized Investment Gains (Losses) Stock option [Member] Share-Based Payment Arrangement, Option [Member] Fair Value of Investments Measured on Recurring Basis [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Reinsurance recoverable on unpaid losses Reinsurance recoverable on unpaid losses Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Reserves for Unpaid Losses and Loss Adjustment Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Short-term Investments Short-Term Investments [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Real Estate Properties [Line Items] Real Estate Properties [Line Items] Debt and Equity Securities, Realized Gain (Loss) [Abstract] Debt and Equity Securities, Realized Gain (Loss) [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Outstanding, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Ceded written premiums Premiums written - ceded Ceded Premiums Written Forfeited, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Property and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Commercial mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Reclassification adjustment included in net income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Assets measured at fair value Assets, Fair Value Disclosure Name Measure Name Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Sales – equity securities Proceeds from Sale of Equity Securities, FV-NI Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Total Estimated Fair Value Total Estimated Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Equipment Equipment [Member] Name Trading Arrangement, Individual Name Unrecognized stock-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Cash and Cash Equivalent Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Premium Receivable, Allowance for Credit Loss Premium Receivable, Allowance for Credit Loss [Table Text Block] Change in the fair value of equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Nonvested outstanding at the end of the period, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Premiums Earned, Net [Abstract] Premiums Earned, Net [Abstract] Available-for-sale securities, percentage of securities with ratings of A minus or better Available-for-sale Securities, Percentage of Securities with Ratings of A Minus or Better The percentage of securities in available-for-sale investments rated as "A-" or better and continue to pay the expected coupon payments under the contractual terms of the securities. Stock-based compensation (shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Gross Investment Income, Operating Gross Investment Income, Operating Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Total expenses Benefits, Losses and Expenses Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Total income tax expense Income Tax Expense (Benefit) Underwriting, acquisition and insurance expenses Other Income and Other Expense Disclosure [Text Block] Effects of Reinsurance on Losses Effects of Reinsurance on Losses [Table Text Block] Effects of Reinsurance on Losses Assets on deposit with state regulatory authorities Assets Held by Insurance Regulators Award Timing Method Award Timing Method [Text Block] Net change in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Reinsurance Recoverables Reinsurance Recoverables [Table Text Block] Reinsurance Recoverables Net income Net income Net income Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Catastrophic Event [Axis] Catastrophic Event [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from stock options exercised Proceeds from Stock Options Exercised Exchange traded funds [Member] Exchange Traded Funds [Member] Exercisable end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Payable for investments purchased Payable for investments purchased Payable for investments purchased not yet settled as of the balance sheet date. Reinsurance Disclosures [Abstract] Reinsurance Disclosures [Abstract] Revenues: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]