Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] 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. Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Tax on net unrealized (losses) gains OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Statistical Measurement [Domain] Statistical Measurement [Domain] Bank loan participations: Bank Loan Participations [Abstract] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Carrying Value Reported Value Measurement [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Document Fiscal Year Focus Document Fiscal Year Focus 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. Adjustment to Compensation, Amount Adjustment to Compensation Amount Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] 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. Financial Instrument [Axis] Financial Instrument [Axis] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] Segment Reporting [Abstract] Schedule of Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Payroll taxes withheld and remitted on net settlement of RSUs Payment, Tax Withholding, Share-Based Payment Arrangement Interest expense Interest expense Interest expense Interest Expense, Operating and Nonoperating Trademarks Trademarks [Member] Schedule of Other Operating Expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Restatement Determination Date Restatement Determination Date Payables to reinsurers Reinsurance Payable Vesting of RSUs (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Measurement Frequency [Axis] Measurement Frequency [Axis] U.S. Treasury securities and obligations guaranteed by the U.S. government US Treasury and Government [Member] Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Specialty Admitted Insurance Specialty Admitted Insurance [Member] Represents information regarding specialty admitted insurance. Disposal Group Classification [Axis] Disposal Group Classification [Axis] Net investment income Net investment income Net Investment Income Commercial Auto LPT, E&S ADC And E&S Top Up ADC Commercial Auto LPT, E&S ADC And E&S Top Up ADC [Member] Commercial Auto LPT, E&S ADC And E&S Top Up ADC Allowance for credit losses on reinsurance recoverables Reinsurance Recoverables on Unpaid Losses, Allowance Excess tax expenses on share based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Total fixed maturity securities, Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Investments Investment [Text Block] Schedule of Gross Unrealized Losses and Fair Value for Available-for-Sale Securities Debt Securities, Available-for-Sale [Table Text Block] Investments [Domain] Investments [Domain] E&S Top Up ADC E&S Top Up ADC [Member] E&S Top Up ADC Fee income Fee Income Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Less reclassification adjustment: 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] Transfers in to Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Entity Address, State or Province Entity Address, State or Province Insurance licenses and authorities Licensing Agreements [Member] Fixed maturity securities, gross unrealized losses Gross unrealized losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Jrg Re Jrg Re [Member] Represents information about JRG Re. Purchases Payments to Acquire Equity Securities, FV-NI PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization 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 Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Cumulative amounts ceded under loss portfolio transfer Cumulative Amounts Ceded Under Loss Portfolio Transfer Cumulative Amounts Ceded Under Loss Portfolio Transfer Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Preferred stock, dividend term Preferred Stock, Dividend Term Preferred Stock, Dividend Term Number of reportable segments Number of Reportable Segments Invested assets: Investments [Abstract] Preferred stock, discount rate, percentage Preferred Stock, Discount Rate, Percentage Preferred Stock, Discount Rate, Percentage After five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 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 Entity Address, City or Town Entity Address, City or Town Reinsure percentage Reinsurance, Reinsured Risk, Percentage Indemnity Trust And Loss Fund Trust Indemnity Trust And Loss Fund Trust [Member] Indemnity Trust And Loss Fund Trust Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Cost or 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] Title of Individual [Domain] Title and Position [Domain] Required collateral, percentage Required Collateral, Percentage Required Collateral, Percentage Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Class of Stock [Axis] Class of Stock [Axis] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Dividends on Series A preferred shares Payments of Ordinary Dividends, Preferred Stock and Preference Stock Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Other Operating Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] Standard & Poor's, BBB- or Better Rating [Member] Standard & Poor's, BBB- or Better Rating [Member] Standard & Poor's, BBB- or Better Rating [Member] Return of capital Proceeds from Equity Method Investment, Distribution, Return of Capital Add: Incurred losses and loss adjustment expenses net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Net income (loss) available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Other invested assets: Other Investments [Abstract] Investment collateralized notes receivable Investment Collateralized Notes Receivable Investment Collateralized Notes Receivable Significant Other Observable Inputs Level 2 Fair Value, Inputs, Level 2 [Member] Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Line of credit maximum capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Rate of interest Investment Interest Rate Private debt Private Debt [Member] Private Debt 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 United States UNITED STATES Other expenses Other Expenses Dividends [Domain] Dividends [Domain] Dividends on Series A preferred shares Dividends on Series A preferred shares Dividends, Preferred Stock Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Investment Income [Table] Investment Income [Table] Adopted and Prospective Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Purchases Payment To Acquire Bank Loan Participations Represents payment to acquire Bank loan participations. Schedule of Company's Segment Results Segment Reporting [Table Text Block] Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Unsecured Debt Unsecured Debt [Member] Reinsurance recoverables Reinsurance Recoverables, Gross Net unrealized (losses) gains, net of taxes of $(257) and $(2,691) in 2026 and $1,310 and $5,117 in 2025 Other comprehensive income (loss) Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Loss from discontinued operations Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic After one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Loss on disposal of discontinued operations, net of tax Loss on disposal of discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Document Period End Date Document Period End Date Other underwriting expenses of the operating segments Other Underwriting Expense 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] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period Reinsurance Recoverables on Unpaid Losses, Gross Capital Stock and Equity Awards Equity [Text Block] Basic Net income (loss) per common share, Basic Earnings Per Share, Basic [Abstract] Series A redeemable preferred shares, outstanding (in shares) Temporary Equity, Shares Outstanding Security Exchange Name Security Exchange Name Fixed maturity securities, gross realized losses Debt Securities, Available-for-Sale, Realized Loss U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Gross written premiums Gross written premiums Premiums Written, Gross 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. After ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Payments for reinsurance Payments for Reinsurance Restricted cash equivalents Restricted cash equivalents at beginning of period Restricted cash equivalents at end of period Restricted Cash Equivalent State National State National [Member] State National Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Maximum number of shares available for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Fixed maturity securities, 12 months or more, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name U.S. income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Net income (loss) per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] 2013 Facility 2013 Facility [Member] 2013 Facility Convertible preferred stock, shares issued upon conversion (in shares) Convertible Preferred Stock, Shares Issued upon Conversion Geographical [Domain] Geographical [Domain] Identifiable intangible assets not subject to amortization Intangible Asset, Excluding Goodwill, Indefinite-Lived Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment 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 common shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Company Selected Measure Name Company Selected Measure Name 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) Purchases Payments to Acquire Debt Securities, Available-for-Sale Notes receivable three Notes Receivable Three [Member] Notes Receivable Three Underwriting profit (loss) Underwriting (loss) profit Underwriting Profit (Loss) Represents the amount related to underwriting profit (loss) during the period. Bank Loan Participations Loan Participations and Assignments [Member] Residential mortgage-backed Residential Mortgage Backed Fair Value Represents fair value of residential mortgage backed. Diluted Net income (loss) per common share, Diluted Earnings Per Share, Diluted [Abstract] Dividend payable, record date Dividends Payable, Date of Record Equity securities, at cost Equity Securities, FV-NI, Cost Fixed Maturity Securities Total fixed maturity securities, available-for-sale Debt Securities [Member] Asset Class [Domain] Asset Class [Domain] Credit Facility [Domain] Credit Facility [Domain] 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 Compensation Amount Outstanding Recovery Compensation Amount Aleka Aleka [Member] Aleka Individual: Individual [Axis] Percentage of outstanding shares Business Combination, Voting Equity Interest Acquired, Percentage Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Unrealized losses Bank Loan Participations, Realized and Unrealized Losses, Credit Related Impairments Bank Loan Participations, Realized and Unrealized Losses, Credit Related Impairments Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Number of notes maturing in 2064 Number Of Notes Maturing In 2064 Number Of Notes Maturing In 2064 Disposal Group Name [Domain] Disposal Group Name [Domain] Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Underlying Security Market Price Change Underlying Security Market Price Change, Percent Schedule Of Acquired Intangible Assets [Table] Schedule Of Acquired Intangible Assets [Table] Represents the tabular information related to intangible assets acquired in the acquisition. Dividends payable Dividends Payable Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Investment in variable interest entities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Line of credit current capacity Line of Credit Facility, Current Borrowing Capacity Various LLCs Various LLCs [Member] Various LLCs Dilutive potential common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment 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] Accrued investment income Accrued Investment Income Receivable Award Timing Predetermined Award Timing Predetermined [Flag] Schedule of Components of Comprehensive Loss (Income) Comprehensive Income (Loss) [Table Text Block] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Reinsurance recoverable on paid losses Reinsurance Recoverable for Paid Claims and Claims Adjustments 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] Compensation expense under share incentive plans APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Net Quoted Prices in Active Markets for Identical Assets Level 1 Fair Value, Inputs, Level 1 [Member] 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 Effective tax Effective Income Tax Rate Reconciliation, Percent Indefinite-lived Intangible Assets, Major Class Name [Domain] Intangible Asset, Indefinite-Lived, Class [Domain] Short-term investments and other Short Term Investments And Other Gross Realized Gains (Losses) Short Term Investments And Other Gross Realized Gains (Losses) Fixed maturity securities, available-for-sale: Fixed maturity securities, available-for-sale: Debt Securities, Available-for-Sale [Abstract] Reinsure excess amount Reinsure Excess Amount Reinsure Excess Amount 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 All Executive Categories All Executive Categories [Member] Available-for-sale fixed maturity securities and equity securities Securities (Assets) [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Residential mortgage-backed Residential Mortgage-Backed Securities [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Plan Name [Domain] Plan Name [Domain] Scenario [Domain] Scenario [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Selling costs incurred Discontinued Operations, Transaction Costs Discontinued Operations, Transaction Costs 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. Maturities, calls and paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Preferred stock, convertible, conversion price (in dollars per share) Preferred Stock, Convertible, Conversion Price Deduct: Loss and loss adjustment expense payments net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Downward adjustment Disposal Group, Including Discontinued Operation, Consideration Downward Adjustment Disposal Group, Including Discontinued Operation, Consideration Downward Adjustment One year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 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] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment Information Segment Reporting [Text Block] Maturities and calls Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Minimum Minimum [Member] Senior debt Senior debt Long-Term Line of Credit Investment Type [Axis] Investment Type [Axis] Dividends on common stock Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Net gain (loss) in bank loan participations Bank loan participations Bank Loan Participations, Net Gain (Loss) Bank Loan Participations, realized and unrealized net gains (losses) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Liabilities: Liabilities [Abstract] Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Limited partnerships Partnership Interest [Member] 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] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] LPT Trust And Loss Fund Trust LPT Trust And Loss Fund Trust [Member] LPT Trust And Loss Fund Trust Other liabilities Other Liabilities Disposal Group, Including Discontinued Operations [Line Items] Disposal Group, Including Discontinued Operations [Line Items] Commercial Auto LPT Commercial Auto Business [Member] Commercial Auto Business Business Combination [Line Items] Business Combination [Line Items] Dividends on common stock Dividends, Common Stock Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Notes Receivable Five Notes Receivable Five [Member] Notes Receivable Five Common stock, authorized (in shares) Common Stock, Shares Authorized Restricted stock unit dividend equivalents Restricted Stock Unit Dividend Equivalents Represents amount of dividend equivalent of RSU's. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Life (Years) Intangible Asset, Finite-Lived, Useful Life Notes receivable four Notes Receivable Four [Member] Notes Receivable Four Associated Trust Agreement [Domain] Associated Trust Agreement [Domain] Associated Trust Agreement [Domain] Fixed maturity securities, gross realized gains Debt Securities, Available-for-Sale, Realized Gain After ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Recurring basis Fair Value, Recurring [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Schedule of Other Invested Assets Other Invested Asset [Table Text Block] Tabular disclosure of other invested assets consisting of private debt and equity investments. Adverse prior year development ceded on subject business Prior years - retroactive reinsurance impact Less: losses and loss adjustment expense - retroactive reinsurance Prior Year Claims and Claims Adjustment Expense, Retroactive Reinsurance Prior Year Claims and Claims Adjustment Expense, Retroactive Reinsurance Unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] 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] Segments [Domain] Segments [Domain] Temporary Equity [Line Items] Temporary Equity [Line Items] State and municipal US States and Political Subdivisions Debt Securities [Member] 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, Including Discontinued Operation Number of insurance companies Number Of Insurance Companies This element represents number of insurance companies owned by the entity. Sales Proceeds from Sale of Debt Securities, Available-for-Sale 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 Senior Debt Debt Disclosure [Text Block] Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Preferred stock convertible mandatory percentage Preferred Stock, Convertible, Mandatory Conversion, Percentage Preferred Stock, Convertible, Mandatory Conversion, Percentage Scenario [Axis] Scenario [Axis] Convertible Preferred Stock Convertible Preferred Stock [Member] Disposal Group Classification [Domain] Disposal Group Classification [Domain] 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 Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Business Combination [Table] Business Combination [Table] Equity Component [Domain] Equity Component [Domain] Deferred policy acquisition costs Deferred Policy Acquisition Cost PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Total gains or losses (realized/unrealized)-Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Secured Debt Secured Debt [Member] Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Adoption Date Trading Arrangement Adoption Date Deduct: Change in deferred reinsurance gain - retroactive reinsurance Increase (Decrease) In Deferred Reinsurance Gain Increase (Decrease) In Deferred Reinsurance Gain Total Amount Dividends, Common Stock, Cash Counterparty Name [Domain] Counterparty Name [Domain] Total shareholders’ equity Balance Balance Equity, Attributable to Parent Equity securities: Short-Term Investments [Abstract] 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 Total equity securities Equity Securities, FV-NI, Current Assets Assets [Abstract] Number of notes maturing in 2031 Number Of Notes Maturing In 2031 Number Of Notes Maturing In 2031 Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other Liabilities Disclosure [Abstract] Other invested assets Carrying Value Other Investments Accounting Policies [Abstract] Accounting Policies [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 Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Number of notes maturing in 2035 Number Of Notes Maturing In 2035 Number Of Notes Maturing In 2035 Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Total incurred losses and loss adjustment expenses Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Business Combination [Domain] Business Combination [Domain] Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] PRSU performance adjustment (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjustment, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjustment, Weighted Average Grant Date Fair Value Number of securities excluded from the calculations of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount RSUs RSUs Restricted Stock Units (RSUs) [Member] Entity Central Index Key Entity Central Index Key Common stock – 2026 and 2025: $0.0002 par value; 200,000,000 shares authorized; 46,239,030 and 45,968,584 shares issued and outstanding, respectively Common Stock, Value, Outstanding All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate and Other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Business Combination [Axis] Business Combination [Axis] 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] Income Tax Expense Income Tax, Policy [Policy Text Block] Net cash (used in) provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Development on prior year loss adverse (favorable) reserves Prior years - excluding retroactive reinsurance Prior Year Claims and Claims Adjustment Expense Income Statement [Abstract] Income Statement [Abstract] Shareholders’ equity: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Rasier and Aleka Rasier And Aleka [Member] Rasier And Aleka Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Net realized and unrealized gains (losses) on investments Total Net realized and unrealized losses on investments Gain (Loss) on Investments Outstanding commitments to invest Commitment to Investment In Limited Partnership Commitment to Investment In Limited Partnership Investment, Name [Axis] Investment, Name [Axis] Preferred stock, dividend rate, percentage Preferred Stock, Dividend Rate, Percentage Expenses Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Gross Carrying Amounts and Accumulated Amortization for Finite-Lived Intangible Assets Intangible Asset, Finite-Lived [Table Text Block] Sales Proceeds From Bank Loan Participations Represents cash inflow from sales of bank loan participations. Securities receivable or payable, net Payments for (Proceeds from) Unsettled Investments, Net Payments for (Proceeds from) Unsettled Investments, Net 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 City Area Code City Area Code Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Name Forgone Recovery, Individual Name 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] Private Specialty Credit Private Specialty Credit [Member] Private Specialty Credit Schedule of Net Realized Gains and Losses on Investments Realized Gain (Loss) on Investments [Table Text Block] Weighted-average period of unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Voting equity percentage Preferred Stock, Convertible, Voting Equity, Maximum Preferred Stock, Convertible, Voting Equity, Maximum Discontinued operations (Note 2): Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent [Abstract] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 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 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 Segment assets Assets Excluding Assets Held For Sale Assets Excluding Assets Held For Sale James River Group, Inc. James River Group Inc [Member] Represents information regarding James River Group, Inc. Statement [Line Items] Statement [Line Items] Total assets Assets Entity [Domain] Entity [Domain] Number of trading days Preferred Stock, Convertible, Number Of Trading Days Preferred Stock, Convertible, Number Of Trading Days Investment income (loss) Investment Income Investment Income, Net Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Operating Segments Operating Segments [Member] Net realized investment (losses) gains Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Schedule of Share Based Compensation Expense and Related Tax Benefit Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Total fixed maturity securities, Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Short-term investments, net Payments for (Proceeds from) Short-Term Investments PEO PEO [Member] Share based compensation expense Share-Based Payment Arrangement, Expense Measurement Basis [Axis] Measurement Basis [Axis] Cash provided by (used in) 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 Equity securities, gross realized losses Equity Securities, FV-NI, Realized Loss Goodwill Segment goodwill Goodwill Share based compensation, additional shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Number of issuers Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Credit Rating, AM Best [Axis] Credit Rating, AM Best [Axis] Maturities Proceeds From Maturities From Bank Loan Participations Represents cash inflow from maturities of bank loan participations. Total invested assets Investments Investments 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 Unrealized (losses) gains arising during the period, before U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Rasier Rasier [Member] Rasier Equity securities Equity Securities, FV-NI, Gain (Loss) One year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Subsequent Event Type [Domain] Subsequent Event Type [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Retained Deficit Retained Earnings [Member] Unpaid principal balance Fair Value, Option, Loans Held as Assets, Aggregate Unpaid Principal Balance Fair Value, Option, Loans Held as Assets, Aggregate Unpaid Principal Balance 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 Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Unrealized (losses) gains arising during the period, net of U.S. 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, outstanding (in shares) Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Carrying Value and Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Payment of debt issuance costs Payments of Debt Issuance Costs Corporate Corporate Debt Securities [Member] Diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status PRSU PRSU [Member] PRSU Net cash (used in) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Vesting of RSUs Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Reserve For Losses And Loss Adjustment Expenses [Line Items] Reserve For Losses And Loss Adjustment Expenses [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. Amortization of intangible assets Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Preferred stock – 2026 and 2025: $0.00125 par value; 19,835,000 shares authorized; no shares issued and outstanding Preferred Stock, Value, Outstanding Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Contingent Liabilities [Table] Contingent Liabilities [Table] Discloses information about contingent liabilities. Series A convertible preferred shares, par value (in dollars per share) Temporary Equity, Par or Stated Value Per Share Line of credit facility 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. Net written premiums Premiums Written, Net Unused facility fee on lender commitment Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Net Investment Income [Line Items] Net Investment Income [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Total underwriting profit of operating segments Underwriting Profit Loss Of Operating Segments This element represents amount of underwriting Profit (loss) of operating segments. Prepaid reinsurance premiums Prepaid Reinsurance Premiums Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Losses and loss adjustment expenses – retroactive reinsurance Prior Year Claims and Claims Adjustment Expense, Retroactive Reinsurance, Net Of Benefit Prior Year Claims and Claims Adjustment Expense, Retroactive Reinsurance, Net Of Benefit Other income Other Income Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Fair Value Estimate of Fair Value Measurement [Member] Total Intangible Assets, Gross Intangible Asset, Excluding Goodwill, before Accumulated Amortization Subsegments [Domain] Subsegments [Domain] Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Non Employee Director Plan Non Employee Director Incentive Plan 2014 [Member] Represents information regarding 2014 Non Employee Director Incentive Plan. Subsegments [Axis] Subsegments [Axis] Preferred stock Preferred Stock [Member] AM Best, Below A- Rating AM Best, Below A- Rating [Member] AM Best, Below A- Rating Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] 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. Premiums receivable and agents’ balances, net Premiums and Other Receivables, Net Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Segment Reporting [Table] Segment Reporting [Table] Sixth Street Sixth Street [Member] Sixth Street Title of Individual [Axis] Title and Position [Axis] Investing activities Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Schedule of Available-for-Sale Investments Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Operating activities Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Fixed maturity securities, less than 12 months, 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] Schedule of Dividends Dividends Declared [Table Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Retroactive Reinsurance Schedule of Retroactive Reinsurance [Table Text Block] Schedule of Retroactive Reinsurance Cash equivalent collateral trust arrangement Cash Equivalent Collateral Held In Trust Arrangement Cash Equivalent Collateral Held In Trust Arrangement Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Deferred reinsurance gain Deferred retroactive reinsurance gain at beginning of period Deferred retroactive reinsurance gain at end of period Deferred Reinsurance Gain Deferred Reinsurance Gain Broker relationships Broker Relationships [Member] Represents information related to broker relationships. 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] Dividend declared per common share (in dollars per share) Dividend per Common Share (in dollars per share) Dividend declared per share (in dollars 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] Commercial Auto LPT Loss Portfolio Transfer [Member] Loss Portfolio Transfer Schedule of Available-for-Sale Investments by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Equity securities Equity Securities [Member] 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] Accounting Policies [Table] Accounting Policies [Table] Accounting Policies 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, issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Associated Trust Agreement [Axis] Associated Trust Agreement [Axis] Associated Trust Agreement Net earned premiums Net earned premiums Premiums Earned, Net Margin above SOFR, percentage rate Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate PRSU performance adjustment (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjustment Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjustment 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 Other Comprehensive (Loss) Income Comprehensive Income (Loss) Note [Text Block] Change in net unearned premiums (Increase) Decrease in Unearned Premiums, Net Equity Components [Axis] Equity Components [Axis] Other operating expenses Total Other Cost and Expense, Operating Funds held Funds Held under Reinsurance Agreements, Liability Retroactive reinsurance benefits under the recovery method Retroactive Reinsurance Benefit Recognized Retroactive Reinsurance Benefit Recognized Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] After one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Reclassification adjustment for investment (losses) gains realized 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 Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Equity securities, gross realized gains Equity Securities, FV-NI, Realized Gain Subsequent Events [Abstract] Subsequent Events [Abstract] Total loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] 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 Claims and Claims Adjustment Expense Commercial mortgage and asset-backed Commercial Mortgage-Backed And Asset Backed Securities [Member] Commercial Mortgage-Backed And Asset Backed Securities Financing activities Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Net commissions Insurance Commissions Reinsurance, amount remaining Reinsurance, Aggregate Coverage Limit, Amount Remaining Reinsurance, Aggregate Coverage Limit, Amount Remaining Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Gross Carrying Amounts for Indefinite-Lived Intangible Assets Intangible Asset, Indefinite-Lived [Table Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Liquidation preference (in dollars per share) Temporary Equity, Liquidation Preference Per Share Local Phone Number Local Phone Number Series A redeemable preferred shares, authorized (in shares) Temporary Equity, Shares Authorized Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Short-term investments Short-term investments Other Short-Term Investments 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 Income (loss) from continuing operations before income taxes Reduction in pre-tax income Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingent liabilities (Note 8) Commitments and Contingencies Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Total revenues Segment revenues Revenues Residential mortgage-backed Residential Mortgage Backed Amortized Cost Represents Amortized Cost of Residential mortgage-backed securities. Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Investment Income Income (Loss) from Equity Method Investments Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Credit Rating, AM Best [Domain] Credit Rating, AM Best [Domain] External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Executive Category: Executive Category [Axis] Schedule of RSU Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Reinsurance, aggregate coverage limit Reinsurance, Aggregate Coverage Limit Reinsurance, Aggregate Coverage Limit Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Other operating expenses: Operating Costs and Expenses [Abstract] Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Series A redeemable preferred shares – 2026 and 2025: 165,000 shares authorized; 112,500 shares issued and outstanding Temporary Equity, Carrying Amount, Attributable to Parent Award Type [Domain] Award Type [Domain] Commercial Auto LPT Commercial Auto LPT [Member] Commercial Auto LPT Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount 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 Fair Value Measurements Fair Value Disclosures [Text Block] Significant Unobservable Inputs Level 3 Fair Value, Inputs, Level 3 [Member] Supplemental information Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Total loss and loss adjustment expense payments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Geographical [Axis] Geographical [Axis] Series A redeemable preferred shares, issued (in shares) Temporary Equity, Shares Issued Commitment to invest in notes receivable Commitment To Invest In Notes Receivable Commitment To Invest In Notes Receivable Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] 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 Legal Entity [Axis] Legal Entity [Axis] Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Amortized Cost Represents amortized cost of commercial mortgage and asset-backed. U.S. tax benefit on share based compensation expense Share-Based Payment Arrangement, Expense, Tax Benefit Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Bank loan participations, gross realized losses Bank Loan Participations, Gross Realized Loss Represents the gross realized losses on bank loan participations. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Notes receivable two Notes Receivable Two [Member] Notes Receivable Two 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] Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Measurement Frequency [Domain] Measurement Frequency [Domain] Subsequent Event [Table] Subsequent Event [Table] Ownership percentage Equity Method Investment, Ownership Percentage Employee compensation Labor and Related Expense Excess & Surplus Lines Excess And Surplus Lines [Member] Represents information regarding excess and surplus lines segment. Changes in fair values of bank loan participations Bank Loan Participations, Changes in Fair Value Bank Loan Participations, Changes in Fair Value Disposal Group Name [Axis] Disposal Group Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] After five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Basic (in dollars per share) Earnings Per Share, Basic Percentage of available for sale securities Percentage Of Available For Sale Debt Securities Represents percentage of available for sale debt securities. Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Loss Fund Trust Loss Fund Trust [Member] Loss Fund Trust Award Type [Axis] Award Type [Axis] Notes receivable one Notes Receivable One [Member] Notes Receivable One Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained deficit Retained Earnings (Accumulated Deficit) Amortization of policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Equity securities, at fair value (cost: 2026 – $68,494; 2025 – $66,916) Equity securities Equity Securities, FV-NI 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 Common Stock [Member] Fixed maturity securities, available-for-sale, at fair value (amortized cost: 2026 – $1,496,081; 2025 – $1,448,750) 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 Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Insurance [Abstract] Credit Agreement Credit Agreement [Member] Credit Agreement Equity securities: Equity Securities, FV-NI [Abstract] TPG Credit TPG Credit [Member] TPG Credit Equity Awards Adjustments Equity Awards Adjustments [Member] Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Fair Value Represents fair value of commercial mortgage and asset backed. Fixed maturity securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Series A Preferred Shares Temporary Equity Disclosure [Text Block] Temporary Equity Disclosure Reinsurance Transaction [Axis] Reinsurance Transaction [Axis] Reinsurance Transaction Total liabilities, Series A redeemable preferred shares, and shareholders’ equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Dividends payable, date to be paid Dividends Payable, Date to be Paid Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segments [Axis] Segments [Axis] Dividends on Series A preferred shares Less: Dividends on Series A preferred shares Temporary Equity, Dividends, Adjustment Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Senior debt issuances Proceeds from Issuance of Senior Long-Term Debt Plan Name [Axis] Plan Name [Axis] Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting Policies Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Identifiable intangible assets subject to amortization Intangible Asset, Finite-Lived, after Accumulated Amortization [Abstract] Junior subordinated debt Junior subordinated debt Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Reinsurance recoverable on unpaid losses, net Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Schedule of Net Unrealized Gains and Losses on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Notes Receivable Seven Notes Receivable Seven [Member] Notes Receivable Seven Renewable energy LLCs Renewable Energy Llcs [Member] Name of the investment category. Name Awards Close in Time to MNPI Disclosures, Individual Name 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] Number of trading days immediately preceding mandatory conversion Preferred Stock, Dividend, Trading Days Preferred Stock, Dividend, Trading Days Ceded written premiums Ceded Premiums Written Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Bank loan participations, gross realized gains Bank Loan Participations, Gross Realized Gain Represents the gross realized gains on bank loan participations. Preferred stock, issued Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Proceeds from sales and principal repayments Proceeds From Sale and Repayments Of Other Invested Assets Proceeds From Sale and Repayments Of Other Invested Assets Common stock, covenant, threshold (in dollars per share) Common Stock, Covenant Threshold, Per Share Common Stock, Covenant Threshold, Per Share Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Discontinued Operations and Disposal Groups [Abstract] Name Measure Name Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] 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 and redemptions Proceeds from Sale of Equity Securities, FV-NI Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] 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. Corporate & Other Corporate and Other Corporate Segment and Other Operating Segment [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Fixed maturity securities, fair value Fixed maturity securities, fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Goodwill impairment Goodwill, Impairment Loss Accrued expenses Accrued Liabilities Dividends [Axis] Dividends [Axis] All other operating expenses Other Operating Expenses Other Operating Expenses Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Long Term Incentive Plan 2014 Long Term Incentive Plan 2014 [Member] Represents information regarding Long Term Incentive Plan 2014. Company Selected Measure Amount Company Selected Measure Amount Number of equity securities held Number Of Equity Securities Held Number Of Equity Securities Held Cash distributions from LLCs Proceeds from Equity Method Investment, Distribution Investment in LLC Investment In Llc [Member] Represents investment in LLC`s. Schedule of Underwriting (Loss) Profit of Operating Segments by Individual Segment and Reconciliation to Consolidated (Loss) Income Before Taxes Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Changes in fair values of equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Income (loss) from continuing operations available to common shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Entity Address, Address Line Two Entity Address, Address Line Two Net investment income Gross Investment Income, Operating Change in restricted cash equivalents Increase (Decrease) In Restricted Cash Equivalents Increase (Decrease) In Restricted Cash Equivalents Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One O 2026 Q3 Dividends O 2026 Q3 Dividends [Member] O 2026 Q3 Dividends Total expenses Benefits, Losses and Expenses 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 Income tax expense (benefit) on continuing operations Income Tax Expense (Benefit) Other Operating Expenses and Other Expenses Other Operating Income and Expense [Text Block] Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Purchases Payments To Acquire Other Invested Assets Payments To Acquire Other Invested Assets Award Timing Method Award Timing Method [Text Block] 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 Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 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 Net income (loss) Net (loss) 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] E&S ADC E&S ADC Agreement [Member] E&S ADC Agreement Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Notes Receivable Six Notes Receivable Six [Member] Notes Receivable Six Reinsurance Transaction [Domain] Reinsurance Transaction [Domain] Reinsurance Transaction [Domain] Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Net income (loss) from continuing operations Net income (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Other invested assets – notes receivable Notes Receivable Represents carrying value of notes receivable as on reporting date. Revenues Revenues [Abstract] Temporary Equity [Abstract] Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]