Less reclassification adjustment: OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax [Abstract] Sale of JRG Re Cash payment Proceeds from Divestiture of Businesses Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Short-term investments and other, gross realized gains Short Term Investments And Other Gross Realized Gains Represents the gross profit realized on the sale of short term investment and other. Statistical Measurement [Domain] Statistical Measurement [Domain] Bank loan participations: Bank Loan Participations [Abstract] Schedule of Gross Unrealized Losses and Fair Value for Available-for-Sale Securities Debt Securities, Available-for-Sale [Table Text Block] Reserve For Losses And Loss Adjustment Expenses [Table] Reserve For Losses And Loss Adjustment Expenses [Table] A table or schedule providing information pertaining to reserve for losses and Loss adjustment expenses. Net cash provided by discontinued operations Cash Provided by (Used in) Discontinued Operation Temporary Equity [Abstract] Development on prior year loss adverse (favorable) reserves Prior years - excluding retroactive reinsurance (Favorable) Adverse prior year development ceded on subject business Prior Year Claims and Claims Adjustment Expense Award Timing Predetermined Award Timing Predetermined [Flag] Total Intangible Assets, Gross Intangible Assets, Gross (Excluding Goodwill) Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Short-term investments and other, gross realized losses Short Term Investments And Other Gross Realized Losses Represents the gross loss realized on the sale of short term investment and other. Asset Class [Axis] Asset Class [Axis] Tax on net unrealized (losses) gains OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Total gains or losses (realized/unrealized)-Included in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Investment Income Income (Loss) from Equity Method Investments Reclassification adjustment for investment losses realized in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Tabular List, Table Tabular List [Table Text Block] Unearned premiums Unearned Premiums Basic Net income (loss) per common share, Basic Earnings Per Share, Basic [Abstract] Available-for-sale fixed maturity securities and equity securities Securities (Assets) [Member] Number of notes maturing Number Of Notes Maturing Number Of Notes Maturing Schedule of Dividends Dividends Declared [Table Text Block] Adopted and Prospective Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Carrying Value and Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Disposal Groups, JRG Re's Assets and Liabilities and Operating Results Disposal Groups, Including Discontinued Operations [Table Text Block] Change in net unearned premiums (Increase) Decrease in Unearned Premiums, Net Fixed Maturity Securities Total fixed maturity securities, available-for-sale Debt Securities [Member] Vesting of RSUs Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Total fixed maturity securities, Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Basic (in dollars per share) Earnings Per Share, Basic Other expenses Other Expenses Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Dividends on Series A preferred shares Dividends on Series A preferred shares Payments of Ordinary Dividends, Preferred Stock and Preference Stock Specialty Admitted Insurance Specialty Admitted Insurance [Member] Represents information regarding specialty admitted insurance. Schedule of Company's Segment Results Schedule of Segment Reporting Information, by Segment [Table Text Block] Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Dividends payable, date to be paid Dividends Payable, Date to be Paid Vesting of RSUs (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Change in net unearned premiums Disposal Group, Including Discontinued Operation, (Increase) Decrease in Unearned Premiums, Net Disposal Group, Including Discontinued Operation, (Increase) Decrease in Unearned Premiums, Net Schedule of Available-for-Sale Investments Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount E&S Top Up ADC E&S Top Up ADC [Member] E&S Top Up ADC Non-qualified stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Jrg Re Jrg Re [Member] Represents information about JRG Re. Total Amount Dividends, Common Stock, Cash Total shareholders’ equity Balance Balance Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Share based compensation expense Share-Based Payment Arrangement, Expense Ceded written premiums Disposal Group, Including Discontinued Operation, Ceded Premiums Written Disposal Group, Including Discontinued Operation, Ceded Premiums Written Common stock, authorized (in shares) Common Stock, Shares Authorized Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cumulative amounts ceded under loss portfolio transfer Cumulative Amounts Ceded Under Loss Portfolio Transfer Cumulative Amounts Ceded Under Loss Portfolio Transfer Total liabilities, Series A redeemable preferred shares, and shareholders’ equity Liabilities and Equity Recurring basis Fair Value, Recurring [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Deferred policy acquisition costs Deferred Policy Acquisition Cost Preferred stock, dividend term Preferred Stock, Dividend Term Preferred Stock, Dividend Term Insurance licenses and authorities Licensing Agreements [Member] Cash Flows from Discontinued Operations Cash Provided by (Used in) Discontinued Operation [Abstract] Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Life (Years) Finite-Lived Intangible Asset, Useful Life Preferred stock, discount rate, percentage Preferred Stock, Discount Rate, Percentage Preferred Stock, Discount Rate, Percentage Non-employee directors Non-employee Directors [Member] Non-employee Directors [Member] Preferred stock, dividend payment rate, variable spread Preferred Stock, Dividend Payment Rate, Variable Spread Preferred Stock, Dividend Payment Rate, Variable Spread Accounting Policies [Abstract] Accounting Policies [Abstract] Fixed maturity securities, fair value Total fair value Debt Securities, Available-for-Sale, Unrealized Loss Position After ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Indemnity Trust And Loss Fund Trust Indemnity Trust And Loss Fund Trust [Member] Indemnity Trust And Loss Fund Trust Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Required collateral, percentage Required Collateral, Percentage Required Collateral, Percentage External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Temporary Equity [Line Items] Temporary Equity [Line Items] Other Operating Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] Liabilities: Liabilities [Abstract] BBB- or better Standard & Poor's, BBB- or Better Rating [Member] Standard & Poor's, BBB- or Better Rating [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income from continuing operations before income taxes Reduction in pre-tax income Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] 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] Pre close dividend Selling Agreement, Pre Close Dividend Selling Agreement, Pre Close Dividend Private debt Private Debt [Member] Private Debt Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Bank loan participations, at fair value Bank loan participations Fair Value, Option, Loans Held as Assets, Aggregate Fair Value Fair Value, Option, Loans Held as Assets, Aggregate Fair Value Operating Segments Operating Segments [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Net income from continuing operations Net income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent One year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Purchases Payment To Acquire Bank Loan Participations Represents payment to acquire Bank loan participations. Schedule of Share Based Compensation Expense and Related Tax Benefit Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Secured Debt Secured Debt [Member] Maturities and calls Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Document Fiscal Period Focus Document Fiscal Period Focus Total loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Series A redeemable preferred shares, authorized (in shares) Temporary Equity, Shares Authorized Unsecured Debt Unsecured Debt [Member] Award Timing Method Award Timing Method [Text Block] Schedule of Net Unrealized Gains and Losses on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Award Type [Axis] Award Type [Axis] Schedule of Components of Comprehensive Income (Loss) Comprehensive Income (Loss) [Table Text Block] Legal Entity [Axis] Legal Entity [Axis] Discontinued operations (Note 2): Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent [Abstract] Total assets Assets Assets Investing activities Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Investment, Name [Domain] Investment, Name [Domain] Impairment loss Debt Securities, Available-for-Sale, Impairment Loss Debt Securities, Available-for-Sale, Impairment Loss Schedule of RSU Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Trading Symbol Trading Symbol Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Geographical [Domain] Geographical [Domain] Income Tax Expense Income Tax, Policy [Policy Text Block] Entity Address, City or Town Entity Address, City or Town Acquired Intangible Assets [Line Items] Acquired Intangible Assets [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. State National State National [Member] State National Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount RSUs RSUs Restricted Stock Units (RSUs) [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Dividend declared per common share (in dollars per share) Dividend declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Other invested assets Carrying Value Other Investments Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Options, outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 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] Prepaid reinsurance premiums Prepaid Reinsurance Premiums Significant Other Observable Inputs Level 2 Fair Value, Inputs, Level 2 [Member] 2013 Facility 2013 Facility [Member] 2013 Facility Series A convertible preferred shares, par value (in dollars per share) Temporary Equity, Par or Stated Value Per Share Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Identifiable intangible assets not subject to amortization Indefinite-Lived Intangible Assets (Excluding Goodwill) Business Combination [Domain] Business Combination [Domain] Common stock, outstanding (in shares) Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Insurance [Abstract] Notes receivable three Notes Receivable Three [Member] Notes Receivable Three Plan Name [Axis] Plan Name [Axis] Underwriting profit (loss) Underwriting profit Underwriting Profit (Loss) Represents the amount related to underwriting profit (loss) during the period. PEO PEO [Member] Transfers in to Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Commitment to investment in notes Commitment To Investment In Notes Commitment To Investment In Notes Residential mortgage-backed Residential Mortgage Backed Fair Value Represents fair value of residential mortgage backed. Schedule of Available-for-Sale Investments by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Senior debt issuances Proceeds from Issuance of Senior Long-Term Debt Reinsurance recoverables Reinsurance Recoverables, Gross Corporate and Other Corporate Segment and Other Operating Segment [Member] United States UNITED STATES 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] Retained Deficit Retained Earnings [Member] Total loss and loss adjustment expense payments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Aleka Aleka [Member] Aleka Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] Cash, cash equivalents, and restricted cash equivalents at beginning of period Cash, cash equivalents, and restricted cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Unrealized losses Bank Loan Participations, Realized and Unrealized Losses, Credit Related Impairments Bank Loan Participations, Realized and Unrealized Losses, Credit Related Impairments Income tax expense on continuing operations Income Tax Expense (Benefit) Fixed maturity securities, 12 months or more, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Other assets Other Assets Schedule Of Acquired Intangible Assets [Table] Schedule Of Acquired Intangible Assets [Table] Represents the tabular information related to intangible assets acquired in the acquisition. Beginning balance Ending balance Asset value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Subsegments [Axis] Subsegments [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fixed maturity securities, available-for-sale: Fixed maturity securities, available-for-sale: Debt Securities, Available-for-Sale [Abstract] Add: Incurred losses and loss adjustment expenses net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Various LLCs Various LLCs [Member] Various LLCs Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Net investment income Net investment income Net Investment Income Dividend payable, record date Dividends Payable, Date of Record Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Business Combination [Table] Business Combination [Table] Equity securities, gross realized losses Equity Securities, FV-NI, Realized Loss Discontinued Operations and Disposal Groups [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Investments Investment [Text Block] Reinsurance recoverable on paid losses Reinsurance Recoverable for Paid Claims and Claims Adjustments All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Unvested, beginning of period (in shares) Unvested, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Short-term investments and other Short Term Investments And Other Gross Realized Gains (Losses) Short Term Investments And Other Gross Realized Gains (Losses) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net cash provided by investing activities of discontinued operations Cash Provided by (Used in) Investing Activity, Discontinued Operation Junior subordinated debt Junior subordinated debt Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Payables to reinsurers Reinsurance Payable Reinsure excess amount Reinsure Excess Amount Reinsure Excess Amount Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash (used in) provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Sales Proceeds from Sale of Debt Securities, Available-for-Sale O 2025 Q3 Dividends O 2025 Q3 Dividends [Member] O 2025 Q3 Dividends Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Other invested assets: Other Investments [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Net investment income Disposal Group, Including Discontinued Operation, Net Investment Income Disposal Group, Including Discontinued Operation, Net Investment Income Other liabilities Other Liabilities Goodwill Segment goodwill Goodwill Equity securities, at fair value (cost: 2025 – $84,173; 2024 – $82,678) Equity securities Equity Securities, FV-NI Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Selling costs incurred Discontinued Operations, Transaction Costs Discontinued Operations, Transaction Costs PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Net realized and unrealized (losses) gains on investments Total Net realized and unrealized (losses) gains on investments Gain (Loss) on Investments Other income and expenses Other Income And Expenses Represents other income and expenses. Contingent Liabilities [Line Items] Contingent Liabilities [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Weighted-average common shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Downward adjustment Disposal Group, Including Discontinued Operation, Consideration Downward Adjustment Disposal Group, Including Discontinued Operation, Consideration Downward Adjustment Equity Components [Axis] Equity Components [Axis] Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Other operating expenses: Operating Costs and Expenses [Abstract] U.S. income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Number of reportable segments Number of Reportable Segments Interest paid by discontinued operations Interest Paid, Discontinued Operations Net realized and unrealized gains (losses) on bank loan participations Bank loan participations Bank Loan Participations, Net Gain (Loss) Bank Loan Participations, realized and unrealized net gains (losses) Supplemental information Supplemental Cash Flow Information [Abstract] Fixed maturity securities, available-for-sale, at amortized cost Total fixed maturity securities, Cost or Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Net Entity Address, Country Entity Address, Country Other Performance Measure, Amount Other Performance Measure, Amount U.S. Treasury securities and obligations guaranteed by the U.S. government US Treasury and Government [Member] Payment of debt issuance costs Payments of Debt Issuance Costs Loss from discontinued operations Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Dividends on common shares Dividends, Common Stock LPT Trust And Loss Fund Trust LPT Trust And Loss Fund Trust [Member] LPT Trust And Loss Fund Trust Commercial Auto LPT Commercial Auto Business [Member] Commercial Auto Business Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Equity securities Equity Securities, FV-NI, Gain (Loss) Restricted stock unit dividend equivalents Restricted Stock Unit Dividend Equivalents Represents amount of dividend equivalent of RSU's. Individual: Individual [Axis] Notes receivable four Notes Receivable Four [Member] Notes Receivable Four Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Associated Trust Agreement [Domain] Associated Trust Agreement [Domain] Associated Trust Agreement [Domain] Dividends on common shares Payments of Ordinary Dividends, Common Stock Invested assets: Investments [Abstract] Entity [Domain] Entity [Domain] Stock options, restricted share units ("RSU's") and convertible preferred stock Stock Options, Restricted Stock Units And Convertible Preferred Stock [Member] Stock options and share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met. Net cash (used in) provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Schedule of Other Invested Assets Other Invested Asset [Table Text Block] Tabular disclosure of other invested assets consisting of private debt and equity investments. 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] Prior years - retroactive reinsurance Less: losses and loss adjustment expense - retroactive reinsurance Losses and loss adjustment expenses – retroactive reinsurance Prior Year Claims and Claims Adjustment Expense, Retroactive Reinsurance Prior Year Claims and Claims Adjustment Expense, Retroactive Reinsurance Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Investment in variable interest entities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Losses and loss adjustment expenses Disposal Group, Including Discontinued Operation, Losses And Loss Adjustment Expenses Disposal Group, Including Discontinued Operation, Losses And Loss Adjustment Expenses Number of insurance companies Number Of Insurance Companies This element represents number of insurance companies owned by the entity. Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Effective tax Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Common stock, covenant, threshold, cash paid (in dollars per share) Common Stock, Dividend Per Share, Cash Payments, Threshold Common Stock, Dividend Per Share, Cash Payments, Threshold Equity securities, gross realized gains Equity Securities, FV-NI, Realized Gain Preferred stock convertible mandatory percentage Preferred Stock, Convertible, Mandatory Conversion, Percentage Preferred Stock, Convertible, Mandatory Conversion, Percentage Operating activities Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Plan Name [Domain] Plan Name [Domain] Carrying Value Reported Value Measurement [Member] Equity securities: Short-Term Investments [Abstract] Weighted-average period of unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Payout for achievement, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Maximum Segment Information Segment Reporting Disclosure [Text Block] Deduct: Change in deferred reinsurance gain - retroactive reinsurance Increase (Decrease) In Deferred Reinsurance Gain Increase (Decrease) In Deferred Reinsurance Gain Convertible preferred stock, shares issued upon conversion (in shares) Convertible Preferred Stock, Shares Issued upon Conversion Trademarks Trademarks [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Number of notes issued Number Of Notes Issued Number Of Notes Issued Payout for achievement, target Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Target Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Target Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Amortization of intangible assets Amortization of intangible assets Amortization of Intangible Assets Liquidation preference (in dollars per share) Temporary Equity, Liquidation Preference Per Share Reinsure percentage Reinsurance, Reinsured Risk, Percentage Income from continuing operations available to common shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Entity Central Index Key Entity Central Index Key PEO Name PEO Name Total revenues Segment revenues Revenues 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Residential mortgage-backed Residential Mortgage-Backed Securities [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total incurred losses and loss and adjustment expenses Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Funds held Funds Held under Reinsurance Agreements, Liability Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Other Operating Expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Net written premiums Premiums Written, Net Segments [Axis] Segments [Axis] Series A redeemable preferred shares – 2025 and 2024: 165,000 shares authorized; 112,500 shares issued and outstanding Temporary Equity, Carrying Amount, Attributable to Parent Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Rasier and Aleka Rasier And Aleka [Member] Rasier And Aleka Estimated transaction value Disposal Group, Including Discontinued Operation, Consideration Assets Assets [Abstract] Outstanding commitments to invest Commitment to Investment In Limited Partnership Commitment to Investment In Limited Partnership Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Entity Address, Address Line Three Entity Address, Address Line Three Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Fair Value Measurements Fair Value Disclosures [Text Block] Business Combination [Line Items] Business Combination [Line Items] Sales Proceeds From Bank Loan Participations Represents cash inflow from sales of bank loan participations. Credit Facility [Domain] Credit Facility [Domain] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Securities receivable or payable, net Payments for (Proceeds from) Unsettled Investments, Net Payments for (Proceeds from) Unsettled Investments, Net Shareholders’ equity: Equity, Attributable to Parent [Abstract] 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] Total expenses Benefits, Losses and Expenses Losses and loss adjustment expenses excluding retroactive reinsurance Prior Year Claims and Claims Adjustment Expense, Excluding Retroactive Reinsurance Prior Year Claims and Claims Adjustment Expense, Excluding Retroactive Reinsurance Gross written premiums Gross written premiums Premiums Written, Gross Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Net commissions Insurance Commissions Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Investment, Name [Axis] Investment, Name [Axis] Investments [Domain] Investments [Domain] Reinsurance recoverable on unpaid losses, net Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Voting equity percentage Preferred Stock, Convertible, Voting Equity, Maximum Preferred Stock, Convertible, Voting Equity, Maximum Total principal balance received Proceeds from Sale and Maturity of Other Investments Allowance for credit losses on reinsurance recoverables Reinsurance Recoverables on Unpaid Losses, Allowance Number of shares to be received per PRSU (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent Right, Number Of Shares To Be Received Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent Right, Number Of Shares To Be Received James River Group, Inc. James River Group Inc [Member] Represents information regarding James River Group, Inc. Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Equity securities, at cost Equity Securities, FV-NI, Cost Entity Registrant Name Entity Registrant Name Number of trading days Preferred Stock, Convertible, Number Of Trading Days Preferred Stock, Convertible, Number Of Trading Days Series A redeemable preferred shares, outstanding (in shares) Temporary Equity, Shares Outstanding Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Employee compensation Labor and Related Expense Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Title of Individual [Domain] Title and Position [Domain] Unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Document Quarterly Report Document Quarterly Report Fixed maturity securities, less than 12 months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Number of issuers Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Total expenses Disposal Group, Including Discontinued Operation, Total Expense Disposal Group, Including Discontinued Operation, Total Expense Gross written premiums Disposal Group, Including Discontinued Operation, Gross Written Premiums Disposal Group, Including Discontinued Operation, Gross Written Premiums Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Purchases Payments to Acquire Equity Securities, FV-NI Accrued investment income Accrued Investment Income Receivable Cash (used in) provided by operating activities excluding reduction in collateral funds Net Cash Provided by (Used in) Operating Activities Excluding Change in Collateral Funds Net Cash Provided by (Used in) Operating Activities Excluding Change in Collateral Funds Investment Type [Axis] Investment Type [Axis] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Total invested assets Investments Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Other underwriting expenses of the operating segments Other Underwriting Expense Maturities Proceeds From Maturities From Bank Loan Participations Represents cash inflow from maturities of bank loan participations. 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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Other Operating Expenses and Other Expenses Other Operating Income and Expense [Text Block] Other income Other Income Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Compensation Amount Outstanding Recovery Compensation Amount Contingent Liabilities [Table] Contingent Liabilities [Table] Discloses information about contingent liabilities. Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Subsegments [Domain] Subsegments [Domain] Schedule of Reconciliation of Beginning and Ending Reserve Balances for Losses and Loss Adjustment Expenses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Accordion feature, increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of credit facility, accordion feature, increase limit, subject to certain conditions by obtaining additional commitments from existing and/or new lenders. Preferred Shares (Par) Preferred stock Preferred Stock [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] After one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Name Awards Close in Time to MNPI Disclosures, Individual Name Unvested, beginning of period (in dollars per share) Unvested, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Total underwriting profit of operating segments Underwriting Profit Loss Of Operating Segments This element represents amount of underwriting Profit (loss) of operating segments. Net realized investment gains (losses) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Downward adjustment paid Disposal Group, Including Discontinued Operation, Downward Adjustment Paid Disposal Group, Including Discontinued Operation, Downward Adjustment Paid Revenues Revenues [Abstract] After five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Compensation expense under share incentive plans APIC, Share-Based Payment Arrangement, Increase for Cost Recognition U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Financial Instruments [Domain] Financial Instruments [Domain] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Segments [Domain] Segments [Domain] 2014 Director Plan Non Employee Director Plan Non Employee Director Incentive Plan 2014 [Member] Represents information regarding 2014 Non Employee Director Incentive Plan. Schedule of Gross Carrying Amounts for Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] AM Best, Below A- Rating AM Best, Below A- Rating [Member] AM Best, Below A- Rating Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Reserve for Losses and Loss Adjustment Expenses Liability For Claims And Claims Adjustment Expense [Text Block] The entire disclosure for the liability for claims and claims adjustment expense. 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Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Senior debt repayments Repayments of Senior Debt Net earned premiums Net earned premiums Premiums Earned, Net Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Title of Individual [Axis] Title and Position [Axis] Commercial Auto LPT Loss Portfolio Transfer [Member] Loss Portfolio Transfer Total revenues Disposal Group, Including Discontinued Operation, Revenue Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Schedule of Net Realized Gains and Losses on Investments Realized Gain (Loss) on Investments [Table Text Block] Commitments and contingent liabilities (Note 8) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Accounting Policies [Table] Accounting Policies [Table] Accounting Policies Business Combination [Axis] Business Combination [Axis] Entity Small Business Entity Small Business Percentage of outstanding shares Business Combination, Voting Equity Interest Acquired, Percentage Preferred stock, convertible, conversion price (in dollars per share) Preferred Stock, Convertible, Conversion Price Associated Trust Agreement [Axis] Associated Trust Agreement [Axis] Associated Trust Agreement Other operating expenses Total Other Cost and Expense, Operating Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report After one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Ownership percentage Equity Method Investment, Ownership Percentage Retroactive reinsurance benefits under the recovery method Retroactive Reinsurance Benefit Recognized Retroactive Reinsurance Benefit Recognized Preferred Shares – 2025 and 2024: $0.00125 par value; 19,835,000 shares authorized; no shares issued and outstanding Preferred Stock, Value, Outstanding Underlying Securities Award Underlying Securities Amount Fixed maturity securities, gross realized gains Debt Securities, Available-for-Sale, Realized Gain Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount After ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Diluted Net income (loss) per common share, Diluted Earnings Per Share, Diluted [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Scenario [Axis] Scenario [Axis] Net realized and unrealized losses on investments Disposal Group, Including Discontinued Operation, Gain (Loss) On Investments Disposal Group, Including Discontinued Operation, Gain (Loss) On Investments Commercial mortgage and asset-backed Commercial Mortgage-Backed And Asset Backed Securities [Member] Commercial Mortgage-Backed And Asset Backed Securities Revenues: Disposal Group, Including Discontinued Operation, Revenue [Abstract] Disposal Group, Including Discontinued Operation, Revenue Reinsurance, amount remaining Reinsurance, Aggregate Coverage Limit, Amount Remaining Reinsurance, Aggregate Coverage Limit, Amount Remaining Document Type Document Type Significant Unobservable Inputs Level 3 Fair Value, Inputs, Level 3 [Member] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period Reinsurance Recoverables on Unpaid Losses, Gross Fixed maturity securities, gross realized losses Debt Securities, Available-for-Sale, Realized Loss All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Investment Income [Table] Investment Income [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] 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] Dividends on Series A preferred shares Less: Dividends on Series A preferred shares Temporary Equity, Dividends, Adjustment Other Liabilities Disclosure [Abstract] Net cash used in operating activities of discontinued operations Cash Provided by (Used in) Operating Activity, Discontinued Operation Disposal Group Classification [Axis] Disposal Group Classification [Axis] Restricted cash equivalents Restricted cash equivalents at beginning of period Restricted cash equivalents at end of period Restricted Cash Equivalent Residential mortgage-backed Residential Mortgage Backed Amortized Cost Represents Amortized Cost of Residential mortgage-backed securities. Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Payroll taxes withheld and remitted on net settlement of RSUs Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Short-term investments Short-term investments Other Short-Term Investments Commercial Auto LPT And E&S ADC Commercial Auto LPT And E&S ADC [Member] Commercial Auto LPT And E&S ADC Net income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Reinsurance, aggregate coverage limit Reinsurance, Aggregate Coverage Limit Reinsurance, Aggregate Coverage Limit Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Underwriting (Loss) Profit of Operating Segments by Individual Segment and Reconciliation to Consolidated (Loss) Income Before Taxes Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Net unrealized gains (losses), net of taxes of $1,310 and $5,117 in 2025 and $(627) and $(2,693) in 2024 Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Geographical [Axis] Geographical [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Amortization of discount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Discount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Discount Quoted Prices in Active Markets for Identical Assets Level 1 Fair Value, Inputs, Level 1 [Member] Senior debt Amount outstanding on line of credit Senior debt Long-Term Line of Credit Expenses: Disposal Group, Including Discontinued Operation, Expenses [Abstract] Disposal Group, Including Discontinued Operation, Expenses Diluted (in dollars per share) Earnings Per Share, Diluted Forecast Forecast [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security After five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Credit Rating, AM Best [Domain] Credit Rating, AM Best [Domain] Dividends [Axis] Dividends [Axis] Net income (loss) per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Deduct: Loss and loss adjustment expense payments net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Amortized Cost Represents amortized cost of commercial mortgage and asset-backed. Return of capital Proceeds from Equity Method Investment, Distribution, Return of Capital Number of underlying projects sold Number of Underlying Projects Sold Number of Underlying Projects Sold Bank loan participations, gross realized losses Bank Loan Participations, Gross Realized Loss Represents the gross realized losses on bank loan participations. Notes receivable two Notes Receivable Two [Member] Notes Receivable Two Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Sales and redemptions Proceeds from Sale of Equity Securities, FV-NI Changes in fair values of bank loan participations Bank Loan Participations, Changes in Fair Value Bank Loan Participations, Changes in Fair Value Excess and Surplus Lines Excess And Surplus Lines [Member] Represents information regarding excess and surplus lines segment. Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Series A redeemable preferred shares, issued (in shares) Temporary Equity, Shares Issued Percentage of available for sale securities Percentage Of Available For Sale Debt Securities Represents percentage of available for sale debt securities. Award Timing Disclosures [Line Items] Accrued expenses Accrued Liabilities Loss Fund Trust Loss Fund Trust [Member] Loss Fund Trust Measurement Frequency [Domain] Measurement Frequency [Domain] Reserve for losses and loss adjustment expenses net of reinsurance recoverables at beginning of period Reserve for losses and loss adjustment expenses net of reinsurance recoverables at end of period Liability for Unpaid Claims and Claims Adjustment Expense, Net Unrealized gains (losses) arising during the period, net of U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Notes receivable one Notes Receivable One [Member] Notes Receivable One Credit Rating, AM Best [Axis] Credit Rating, AM Best [Axis] Capital Stock and Equity Awards Equity [Text Block] Value of awards granted Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture Net income Net income Net Income (Loss) Attributable to Parent Dividends [Domain] Dividends [Domain] Subsequent Event [Table] Subsequent Event [Table] Expiration Date Trading Arrangement Expiration Date Changes in fair values of equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Interest expense Disposal Group, Including Discontinued Operation, Interest Expense Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Credit Agreement Credit Agreement [Member] Credit Agreement Ceded written premiums Ceded Premiums Written Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Rate of interest Investment Interest Rate Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Financing activities Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Fair Value Represents fair value of commercial mortgage and asset backed. One year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Series A Preferred Shares Temporary Equity Disclosure [Text Block] Temporary Equity Disclosure Reinsurance Transaction [Axis] Reinsurance Transaction [Axis] Reinsurance Transaction Retained deficit Retained Earnings (Accumulated Deficit) Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [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] Executive Category: Executive Category [Axis] Fixed maturity securities, 12 months or more, gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting Policies Class of Stock [Axis] Class of Stock [Axis] Interest expense Interest expense Interest expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Subsequent Event Type [Domain] Subsequent Event Type [Domain] Fixed maturity securities, less than 12 months, gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Identifiable intangible assets subject to amortization Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Renewable Energy Llcs Renewable Energy Llcs [Member] Name of the investment category. 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] Convertible Preferred Stock Convertible Preferred Stock [Member] Weighted- Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Number of trading days immediately preceding Mandatory Conversion Preferred Stock, Dividend, Trading Days Preferred Stock, Dividend, Trading Days Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Statement [Table] Statement [Table] Net written premiums Disposal Group, Including Discontinued Operation, Premiums Written, Net Disposal Group, Including Discontinued Operation, Premiums Written, Net Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Bank loan participations, gross realized gains Bank Loan Participations, Gross Realized Gain Represents the gross realized gains on bank loan participations. Other operating expenses Disposal Group, Including Discontinued Operation, Operating Expense Fixed maturity securities, gross unrealized losses Gross unrealized losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Cash distributions from LLCs Proceeds from Equity Method Investment, Distribution Cost or Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Total equity securities Equity Securities, FV-NI, Current Number of securities excluded from the calculations of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Reconciliation of Securities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Amendment Flag Amendment Flag U.S. tax benefit on share based compensation expense Share-Based Payment Arrangement, Expense, Tax Benefit Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Maximum number of shares available for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Pre close dividend, forgiveness Selling Agreement, Pre Close Dividend, Forgiveness Selling Agreement, Pre Close Dividend, Forgiveness Reserve for losses and loss adjustment expenses Reserve for losses and loss adjustment expenses gross of reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period Liability for Claims and Claims Adjustment Expense Proceeds from sales and principal repayments Proceeds From Sale and Repayments Of Other Invested Assets Proceeds From Sale and Repayments Of Other Invested Assets Termination Date Trading Arrangement Termination Date Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Common stock, covenant, threshold (in dollars per share) Common Stock, Covenant Threshold, Per Share Common Stock, Covenant Threshold, Per Share Measure: Measure [Axis] Private speciality credit Private Speciality Credit [Member] Private Speciality Credit Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Payments for reinsurance Payments for Reinsurance Schedule of Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Renewable energy notes receivable Renewable Energy Bridge Financing Notes [Member] Name of the investment category. Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Other operating expenses of the Corporate and Other segment Other operating expenses of the Corporate and Other segment Other Operating Expenses Of Corporate And Other Segment Represents Other operating expenses of the Corporate and Other segment. Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] All other operating expenses Other Operating Expenses Other Operating Expenses Proceeds from sale of equity method investments Proceeds from Sale of Equity Method Investments Fixed maturity securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Unrealized gains (losses) arising during the period, before U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Weighted average exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price 2014 LTIP Long Term Incentive Plan 2014 Long Term Incentive Plan 2014 [Member] Represents information regarding Long Term Incentive Plan 2014. Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Number of equity securities held Number Of Equity Securities Held Number Of Equity Securities Held Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Investment in LLC Investment In Llc [Member] Represents investment in LLC`s. Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, issued (in shares) Common Stock, Shares, Issued Gain for change in estimated loss on sale Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Maturities, calls and paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Change in restricted cash equivalents Increase (Decrease) In Restricted Cash Equivalents Increase (Decrease) In Restricted Cash Equivalents Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Corporate and Other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Purchases Payments To Acquire Other Invested Assets Payments To Acquire Other Invested Assets Equity securities Equity Securities [Member] Equity securities: Equity Securities, FV-NI [Abstract] Payout for achievement, threshold Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Threshold Share-Based Compensation Arrangement by Share-Based Payment Award, Payout For Achievement, Threshold Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Line of credit maximum capacity Line of Credit Facility, Maximum Borrowing Capacity Investment Income Investment Income, Net Dividends on Series A preferred shares Dividends on Series A preferred shares Dividends, Preferred Stock Common shares – 2025 and 2024: $0.0002 par value; 200,000,000 shares authorized; 45,895,335 and 45,644,318 shares issued and outstanding, respectively Common Stock, Value, Outstanding Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] E&S ADC E&S ADC Agreement [Member] E&S ADC Agreement Cash paid to JRGH Payment For Selling Agreement, Pre Close Dividend Payment For Selling Agreement, Pre Close Dividend Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Expenses Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Asset Class [Domain] Asset Class [Domain] Total gains or losses (realized/unrealized)-Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Loss from discontinued operations Loss from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Statement [Line Items] Statement [Line Items] Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Reinsurance Transaction [Domain] Reinsurance Transaction [Domain] Reinsurance Transaction [Domain] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Other invested assets – notes receivable Notes Receivable Represents carrying value of notes receivable as on reporting date. Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Counterparty Name [Axis] Counterparty Name [Axis] Subsequent Event [Line Items] Subsequent Event [Line Items] Net investment income Gross Investment Income, Operating Common Shares (Par) Common stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Fixed maturity securities, available-for-sale, at fair value (amortized cost: 2025 – $1,364,455; 2024 – $1,278,337) Total fixed maturity securities, available-for-sale Total investments available-for-sale, Fair Value Fixed maturity securities, available-for-sale Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate Corporate Debt Securities [Member] Change in cash, cash equivalents, and restricted cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Dilutive potential common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment