Ceded premiums payable Ceded Premiums Payable Corporate and Other Corporate Segment and Other Operating Segment [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. Bank loan participations: Bank Loan Participations [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] Total fixed maturity securities, Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax 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. Cover [Abstract] Cover [Abstract] Fixed Maturity Securities Total fixed maturity securities, available-for-sale Debt Securities [Member] 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. Change in cash, cash equivalents, and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Equity securities, gross realized losses Equity Securities, FV-NI, Realized Loss Percentage of outstanding shares Business Acquisition, Percentage of Voting Interests Acquired Trading Symbol Trading Symbol Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Ownership percentage Equity Method Investment, Ownership Percentage 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] U.S. tax benefit on share based compensation expense Share-Based Payment Arrangement, Expense, Tax Benefit Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Dividend declared per common share (in dollars per share) Dividend declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Assets Disposal Group, Including Discontinued Operation, Assets [Abstract] Disposal Group Name [Domain] Disposal Group Name [Domain] Preferred stock, convertible, conversion price Preferred Stock, Convertible, Conversion Price Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Residential mortgage-backed Residential Mortgage-Backed Securities [Member] Purchases – equity securities Payments to Acquire Equity Securities, FV-NI Equity securities Net realized and unrealized gains (losses) on investments in equity securities Equity Securities, FV-NI, Gain (Loss) Specialty Admitted Insurance Specialty Admitted Insurance [Member] Represents information regarding specialty admitted insurance. 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 Fair Value Measurements Fair Value Disclosures [Text Block] 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 Proceeds from issuance of Series A preferred shares Proceeds from Issuance of Preferred Stock and Preference Stock Investment, Name [Domain] Investment, Name [Domain] Allowance for credit losses on reinsurance recoverables Reinsurance Recoverables on Unpaid Losses, Allowance Schedule of RSU Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Fixed maturity securities, gross realized losses Debt Securities, Available-for-Sale, Realized Loss Jrg Re Jrg Re [Member] Represents information about JRG Re. Plan Name [Domain] Plan Name [Domain] Per share price (in dollars per share) Sale of Stock, Price Per Share United States UNITED STATES Ceded written premiums Disposal Group, Including Discontinued Operation, Ceded Premiums Written Disposal Group, Including Discontinued Operation, Ceded Premiums Written Convertible preferred stock, shares issued upon conversion Convertible Preferred Stock, Shares Issued upon Conversion Dilutive potential common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Entity Tax Identification Number Entity Tax Identification Number Series A redeemable preferred shares, issued (in shares) Temporary Equity, Shares Issued Unrealized losses Bank Loan Participations, Unrealized Losses, Credit Related Impairments Bank Loan Participations, Unrealized Losses, Credit Related Impairments Gross Carrying Amount Finite-Lived Intangible Assets, Gross Cumulative amounts ceded under loss portfolio transfer Cumulative Amounts Ceded Under Loss Portfolio Transfer Cumulative Amounts Ceded Under Loss Portfolio Transfer Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Preferred stock, dividend term Preferred Stock, Dividend Term Preferred Stock, Dividend Term Operating Segments Operating Segments [Member] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Deferred policy acquisition costs Deferred Policy Acquisition Cost Sale of stock, consideration received on transaction Sale of Stock, Consideration Received on Transaction Secured Debt Secured Debt [Member] Other operating expenses Total Other Cost and Expense, Operating 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] Plan Name [Axis] Plan Name [Axis] Preferred stock, dividend payment rate, variable spread Preferred Stock, Dividend Payment Rate, Variable Spread Preferred Stock, Dividend Payment Rate, Variable Spread Equity Components [Axis] Equity Components [Axis] Indemnity Trust And Loss Fund Trust Indemnity Trust And Loss Fund Trust [Member] Indemnity Trust And Loss Fund Trust Fixed maturity securities, available-for-sale, at fair value (amortized cost: 2024 – $1,207,960; 2023 – $1,405,136) 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 Measurement Frequency [Axis] Measurement Frequency [Axis] Required collateral, percentage Required Collateral, Percentage Required Collateral, Percentage Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Net cash provided by investing activities of discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Beginning balance Ending balance Asset value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value State and municipal US States and Political Subdivisions Debt Securities [Member] Sale of JRG Re Cash payment Proceeds from Divestiture of Businesses Lapsed (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Lapsed in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Lapsed in Period Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Other Operating Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] BBB- or better Standard & Poor's, BBB- or Better Rating [Member] Standard & Poor's, BBB- or Better Rating [Member] Investments [Domain] Investments [Domain] Diluted Net income (loss) per common share, Diluted Earnings Per Share, Diluted [Abstract] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Loss on disposal of discontinued operations Loss on disposal Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Entity Small Business Entity Small Business Geographical [Axis] Geographical [Axis] Pre close dividend Selling Agreement, Pre Close Dividend Selling Agreement, Pre Close Dividend Maturities and calls – fixed maturity securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Private debt Private Debt [Member] Private Debt Payment of debt issuance costs Payments of Debt Issuance Costs 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 Significant Unobservable Inputs Level 3 Fair Value, Inputs, Level 3 [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Number of securities excluded from the calculations of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Carried reserve percentage Carried Reserve Percentage Carried Reserve Percentage Purchases Payment To Acquire Bank Loan Participations Represents payment to acquire Bank loan participations. Other Operating Expenses and Other Expenses Other Operating Income and Expense [Text Block] Fixed maturity securities, fair value Total fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Credit Facility [Domain] Credit Facility [Domain] Cash, cash equivalents, and restricted cash equivalents at beginning of period Cash, cash equivalents, and restricted cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Deferred reinsurance gain Disposal Group, Including Discontinued Operation, Deferred Reinsurance Gain Disposal Group, Including Discontinued Operation, Deferred Reinsurance Gain Total equity securities Equity Securities, FV-NI, Current 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 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] Unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Goodwill Segment goodwill Goodwill Consolidation Items [Axis] Consolidation Items [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Payroll taxes withheld and remitted on net settlement of RSUs Payment, Tax Withholding, Share-Based Payment Arrangement Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Net income from continuing operations Net income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Options Share-Based Payment Arrangement, Option [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] 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 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. Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Development on prior year loss reserves Prior years - excluding retroactive reinsurance Prior Year Claims and Claims Adjustment Expense State National State National [Member] State National Other expenses Other Expenses Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Security Exchange Name Security Exchange Name Schedule of Available-for-Sale Investments by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Less reclassification adjustment: OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax [Abstract] 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 Award Type [Axis] Award Type [Axis] Corporate Corporate Debt Securities [Member] Basic Net income (loss) per common share, Basic Earnings Per Share, Basic [Abstract] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Liabilities Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Cash equivalent collateral returned to trust Cash Equivalent Collateral Returned to Trust Cash Equivalent Collateral Returned to Trust Gain for change in estimated loss on sale Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] 2013 Facility 2013 Facility [Member] 2013 Facility Total liabilities Liabilities Premiums receivable and agents’ balances, net Disposal Group, Including Discontinued Operation, Premiums And Other Receivables, Net Disposal Group, Including Discontinued Operation, Premiums And Other Receivables, Net Exercisable, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Schedule of Gross Unrealized Losses and Fair Value for Available-for-Sale Securities Debt Securities, Available-for-Sale [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Net Unrealized Gains and Losses on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Prepaid reinsurance premiums Prepaid Reinsurance Premiums Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Underwriting profit Underwriting Profit (Loss) Represents the amount related to underwriting profit (loss) during the period. Subsegments [Axis] Subsegments [Axis] Commitment to investment in notes Commitment To Investment In Notes Commitment To Investment In Notes Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Residential mortgage-backed Residential Mortgage Backed Fair Value Represents fair value of residential mortgage backed. Common stock, shares issued (in shares) Common Stock, Shares, Issued Reinsure percentage Reinsurance, Reinsured Risk, Percentage Junior subordinated debt Junior subordinated debt Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Bank holding companies Bank Holding Companies [Member] Name of the investment category. After ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Entity [Domain] Entity [Domain] Short-term investments Short-term investments Other Short-Term Investments Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Line of credit maximum capacity Line of Credit Facility, Maximum Borrowing Capacity Interest paid by discontinued operations Interest Paid, Discontinued Operations Gross written premiums Premiums Written, Gross Assets held-for-sale (Note 2 - discontinued operations) Assets held for sale Disposal Group, Including Discontinued Operation, Assets Fixed maturity securities, gross realized gains Debt Securities, Available-for-Sale, Realized Gain Fixed maturity securities, gross unrealized losses Gross unrealized losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Aleka Aleka [Member] Aleka Subsequent Event [Line Items] Subsequent Event [Line Items] Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Impairment loss Other-than-temporary Impairment Loss, Debt Securities, Available-for-Sale Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule Of Acquired Intangible Assets [Table] Schedule Of Acquired Intangible Assets [Table] Represents the tabular information related to intangible assets acquired in the acquisition. Weighted- Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Other assets Other Assets Common stock, shares authorized (in shares) Common Stock, Shares Authorized Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Insurance [Abstract] Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Transfers in to Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Write down of JRG Re to fair value less cost to sell Disposal Group, Including Discontinued Operation, Write Down Disposal Group, Including Discontinued Operation, Write Down Various LLCs Various LLCs [Member] Various LLCs Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Total shareholders’ equity Balance Balance Equity, Attributable to Parent Reduction in pretax income Reduction In Pretax Income Reduction In Pretax Income One year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Total revenues Disposal Group, Including Discontinued Operation, Revenue Investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Raiser Raiser [Member] Raiser [Member] Investment Income Investment Income, Net Amount of letters of credit issued Letters of Credit Outstanding, Amount Held-for-Sale and Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Entity Address, Country Entity Address, Country Total principal balance received Proceeds from Sale and Maturity of Other Investments Net unrealized (losses) gains, net of taxes of $(627) and $(2,693) in 2024 and $(3,633) and $1,369 in 2023 Other comprehensive income (loss) Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Recurring basis Fair Value, Recurring Fair Value, Recurring [Member] Short-term investments and other Short Term Investments And Other Gross Realized Gains (Losses) Short Term Investments And Other Gross Realized Gains (Losses) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Fixed maturity securities, 12 months or more, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Maximum number of shares available for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Sale of Stock [Domain] Sale of Stock [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Dividends on Series A preferred shares Less: Dividends on Series A preferred shares Temporary Equity, Dividends, Adjustment Reinsure excess amount Reinsure Excess Amount Reinsure Excess Amount Document Fiscal Period Focus Document Fiscal Period Focus Equity securities Equity Securities [Member] Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Accrued investment income Disposal Group, Including Discontinued Operation, Accrued Investment Income Receivable Disposal Group, Including Discontinued Operation, Accrued Investment Income Receivable Assets Assets [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Net investment income Disposal Group, Including Discontinued Operation, Net Investment Income Disposal Group, Including Discontinued Operation, Net Investment Income Estimated loss on sale Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax Document Type Document Type Selling costs incurred Discontinued Operations, Transaction Costs Discontinued Operations, Transaction Costs Other income and expenses Other Income And Expenses Represents other income and expenses. Investment Income [Table] Investment Income [Table] Schedule of Company's Segment Results Schedule of Segment Reporting Information, by Segment [Table Text Block] 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. Downward adjustment Disposal Group, Including Discontinued Operation, Consideration Downward Adjustment Disposal Group, Including Discontinued Operation, Consideration Downward Adjustment 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 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 amortized cost Total fixed maturity securities, Cost or Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Net cash provided by (used in) discontinued operations Net Cash Provided by (Used in) Discontinued Operations Funds held Disposal Group, Including Discontinued Operation, Funds Held under Reinsurance Agreements, Liability Disposal Group, Including Discontinued Operation, Funds Held under Reinsurance Agreements, Liability Cash dividend declared (in dollars per share) Dividends Payable, Amount Per Share Subsequent Event [Table] Subsequent Event [Table] Identifiable intangible assets not subject to amortization Indefinite-Lived Intangible Assets (Excluding Goodwill) Maximum Maximum [Member] Net gain (loss) in bank loan participations Bank loan participations Net realized and unrealized (losses) gains in bank loan participations Bank Loan Participations, Net Gain (Loss) Bank Loan Participations, realized and unrealized net gains (losses) Securities available-for-sale: Fixed maturity securities, available-for-sale: Debt Securities, Available-for-Sale [Abstract] Amortization of intangible assets Amortization of intangible assets Amortization of Intangible Assets 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] Convertible Preferred Stock Convertible Preferred Stock [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Temporary Equity [Abstract] Investment Type [Axis] Investment Type [Axis] Accounting Policies [Abstract] Accounting Policies [Abstract] Liabilities: Liabilities [Abstract] Revenues Revenues [Abstract] LPT Trust And Loss Fund Trust LPT Trust And Loss Fund Trust [Member] LPT Trust And Loss Fund Trust Commercial Auto Business Commercial Auto Business [Member] Commercial Auto Business Current Fiscal Year End Date Current Fiscal Year End Date Accrued investment income Accrued Investment Income Receivable Statistical Measurement [Axis] Statistical Measurement [Axis] Restricted stock unit dividend equivalents Restricted Stock Unit Dividend Equivalents Represents amount of dividend equivalent of RSU's. Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Associated Trust Agreement [Domain] Associated Trust Agreement [Domain] Associated Trust Agreement [Domain] Award Type [Domain] Award Type [Domain] Insurance licenses and authorities Licensing Agreements [Member] Schedule of Disposal Groups, JRG Re's Assets and Liabilities and Operating Results Disposal Groups, Including Discontinued Operations [Table Text Block] 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. Series A redeemable preferred shares, authorized (in shares) Temporary Equity, Shares Authorized Schedule of Other Invested Assets Other Invested Asset [Table Text Block] Tabular disclosure of other invested assets consisting of private debt and equity investments. Prior years - 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 Title of Individual [Axis] Title and Position [Axis] Life (Years) Finite-Lived Intangible Asset, Useful Life Deduct: Loss and loss adjustment expense payments net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Series A redeemable preferred shares, par value (in dollars per share) Series A convertible preferred shares, par value (in dollars per share) Temporary Equity, Par or Stated Value Per Share Additional Paid-in Capital Additional Paid-in Capital [Member] 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 Other assets Disposal Group, Including Discontinued Operation, Other Assets Number of insurance companies Number Of Insurance Companies This element represents number of insurance companies owned by the entity. 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 Subsequent Event Type [Domain] Subsequent Event Type [Domain] Dividends on common shares Payments of Ordinary Dividends, Common Stock Percentage of then-applicable conversion price threshold Preferred Stock, Convertible, Mandatory Conversion, Percentage Preferred Stock, Convertible, Mandatory Conversion, Percentage Investment, Name [Axis] Investment, Name [Axis] Limited partnerships Partnership Interest [Member] Adopted and Prospective Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Forecast Forecast [Member] Series A Preferred Stock Series A Preferred Stock [Member] Class of Stock [Axis] Class of Stock [Axis] Diluted (in dollars per share) Earnings Per Share, Diluted Title of Individual [Domain] Title and Position [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 Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Entity Interactive Data Current Entity Interactive Data Current Total (loss) income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Sales – fixed maturity securities Proceeds from Sale of Debt Securities, Available-for-Sale Deduct: Change in deferred reinsurance gain - retroactive reinsurance Increase (Decrease) In Deferred Reinsurance Gain Increase (Decrease) In Deferred Reinsurance Gain Losses and loss adjustment expenses Policyholder Benefits and Claims Incurred, Net Deferred policy acquisition costs Disposal Group, Including Discontinued Operation, Deferred Policy Acquisition Costs Disposal Group, Including Discontinued Operation, Deferred Policy Acquisition Costs Accrued expenses Disposal Group, Including Discontinued Operation, Accrued Liabilities Number of notes issued Number Of Notes Issued Number Of Notes Issued External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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 gains or losses (realized/unrealized)-Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Amount to settle litigation Amount To Settle Litigation Amount To Settle Litigation Income tax expense on continuing operations Income Tax Expense (Benefit) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Senior debt repayments Repayments of senior debt Repayments of Senior Debt Corporate and Other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Ceded written premiums Ceded Premiums Written Equity securities: Short-Term Investments [Abstract] Supplemental information Supplemental Cash Flow Information [Abstract] Equity securities, at fair value (cost: 2024 – $120,749; 2023 – $114,107) Equity securities Equity Securities, FV-NI Weighted-average period of unrecognized share based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Preferred stock, dividend rate, percentage Preferred Stock, Dividend Rate, Percentage Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Effective tax Effective Income Tax Rate Reconciliation, Percent Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Interest expense Interest expense Interest expense Interest Expense, Operating and Nonoperating Business Acquisition [Line Items] Business Acquisition [Line Items] Number of reportable segments Number of Reportable Segments Total liabilities, Series A redeemable preferred shares, and shareholders’ equity Liabilities and Equity Subsequent Events Subsequent Events [Text Block] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Additional paid-in capital Additional Paid in Capital Rasier and Aleka Rasier And Aleka [Member] Rasier And Aleka Total invested assets Disposal Group, Including Discontinued Operation, Total Invested Assets Disposal Group, Including Discontinued Operation, Total Invested Assets Outstanding commitments to invest Commitment to Investment In Limited Partnership Commitment to Investment In Limited Partnership Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Legal Entity [Axis] Legal Entity [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 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 Scenario [Domain] Scenario [Domain] Common shares – 2024 and 2023: $0.0002 par value; 200,000,000 shares authorized; 37,825,767 and 37,641,563 shares issued and outstanding, respectively Common Stock, Value, Outstanding Vesting of RSUs Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Interest expense Disposal Group, Including Discontinued Operation, Interest Expense Forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Liabilities held-for-sale (Note 2 - discontinued operations) Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Statement [Line Items] Statement [Line Items] Tax on net unrealized (losses) gains OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax 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. Schedule of Underwriting Profit of Operating Segments by Individual Segment and Reconciliation to Consolidated Income Before Taxes Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Estimated transaction value Disposal Group, Including Discontinued Operation, Consideration Expenses Operating Expenses [Abstract] Number of trading days Preferred Stock, Convertible, Number Of Trading Days Preferred Stock, Convertible, Number Of Trading Days Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Financial Instruments [Domain] Financial Instruments [Domain] 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 Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] 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] Minimum Minimum [Member] Fair Value Estimate of Fair Value Measurement [Member] Net investment income Net investment income Net Investment Income 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 Schedule of Available-for-Sale Investments Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Discontinued operations (Note 2): Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent [Abstract] Amortization of policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Other invested assets: Other Investments [Abstract] Beginning of period (in dollars per share) End of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price After five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 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 Indemnity Trust Indemnity Trust [Member] Indemnity Trust Beginning of period (in shares) End of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Maturities Proceeds From Maturities From Bank Loan Participations Represents cash inflow from maturities of bank loan participations. Segments [Axis] Segments [Axis] Net earned premiums Disposal Group, Including Discontinued Operation, Premiums Earned, Net Disposal Group, Including Discontinued Operation, Premiums Earned, Net Purchases Payments to Acquire Equity Method Investments Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Return of capital Proceeds from Equity Method Investment, Distribution, Return of Capital 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 2017 Facility 2017 Facility [Member] 2017 Facility Earnings Per Share Earnings Per Share [Text Block] Schedule of Components of Comprehensive Loss Comprehensive Income (Loss) [Table Text Block] Subsequent Event Subsequent Event [Member] PRSU PRSU [Member] PRSU Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share (Loss) income from discontinued operations (Loss) income from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Dividends on Series A preferred shares Dividends, Preferred Stock Shareholders’ equity: Equity, Attributable to Parent [Abstract] 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 Fixed maturity securities, less than 12 months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Net realized and unrealized (losses) gains on investments Total Net realized and unrealized (losses) gains on investments Gain (Loss) on Investments Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 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. Subsegments [Domain] Subsegments [Domain] Total invested assets Investments Income Tax Expense Income Tax, Policy [Policy Text Block] Other income Other Income Segments [Domain] Segments [Domain] Contingent Liabilities [Table] Contingent Liabilities [Table] Discloses information about contingent liabilities. Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Temporary Equity [Line Items] Temporary Equity [Line Items] Short-term investments, net Payments for (Proceeds from) Short-Term Investments Other invested assets Carrying Value Other Investments Underwriting profit (loss) of operating segments Total underwriting profit of operating segments Underwriting Profit Loss Of Operating Segments This element represents amount of underwriting Profit (loss) of operating segments. Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Equity securities, at fair value Disposal Group, Including Discontinued Operation, Equity Securities, FV-NI Disposal Group, Including Discontinued Operation, Equity Securities, FV-NI Premiums receivable and agents’ balances, net Premiums and Other Receivables, Net U.S. income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Disposal Group Name [Axis] Disposal Group Name [Axis] Total fixed maturity securities, Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Income from continuing operations available to common shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Investment Income Income (Loss) from Equity Method Investments 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] 2014 Director Plan Non Employee Director Incentive Plan 2014 [Member] Represents information regarding 2014 Non Employee Director Incentive Plan. Reinsurance recoverable on unpaid and paid losses, net Disposal Group, Including Discontinued Operation, Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Disposal Group, Including Discontinued Operation, Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Add: Incurred losses and loss adjustment expenses net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Dividends payable Dividends Payable 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. Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Change in net unearned premiums (Increase) Decrease in Unearned Premiums, Net Local Phone Number Local Phone Number Total Intangible Assets, Gross Intangible Assets, Gross (Excluding Goodwill) Rate of interest Investment Interest Rate Cash equivalent collateral trust arrangement Cash Equivalent Collateral Held In Trust Arrangement Cash Equivalent Collateral Held In Trust Arrangement Deferred reinsurance gain Deferred Reinsurance Gain Deferred Reinsurance Gain Number of issuers Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Broker relationships Broker Relationships [Member] Represents information related to broker relationships. Loss Portfolio Transfer Loss Portfolio Transfer [Member] Loss Portfolio Transfer Equity securities, at cost Equity Securities, FV-NI, Cost Reinsurance recoverables Reinsurance Recoverables, Gross Accounting Policies [Table] Accounting Policies [Table] Accounting Policies Issuance costs Payments of Stock Issuance Costs Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Common Shares Common stock Common Stock [Member] Associated Trust Agreement [Axis] Associated Trust Agreement [Axis] Associated Trust Agreement Unearned premiums Unearned Premiums Asset Class [Domain] Asset Class [Domain] Invested assets: Investments [Abstract] Liquidation preference (in dollars per share) Temporary Equity, Liquidation Preference Per Share Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] L PT Trust LPT Trust [Member] LPT Trust Amount owed by buyer Selling Agreement, Consideration Receivable In Event Of Certain Stock Purchase Agreement Conditions Met Selling Agreement, Consideration Receivable In Event Of Certain Stock Purchase Agreement Conditions Met Entity Emerging Growth Company Entity Emerging Growth Company Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Retroactive reinsurance benefit recognized Retroactive Reinsurance Benefit Recognized Retroactive Reinsurance Benefit Recognized Profit commission amount Profit Commission Maximum Amount Profit Commission Maximum Amount Segment Reporting [Abstract] Segment Reporting [Abstract] Entity Central Index Key Entity Central Index Key Scenario [Axis] Scenario [Axis] Total incurred losses and loss and adjustment expenses Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Discontinued Operations and Disposal Groups [Abstract] Funds held Funds Held under Reinsurance Agreements, Liability Capital Stock and Equity Awards Equity [Text Block] Equity Component [Domain] Equity Component [Domain] Net realized and unrealized (losses) gains on investments Disposal Group, Including Discontinued Operation, Gain (Loss) On Investments Disposal Group, Including Discontinued Operation, Gain (Loss) On Investments Series A redeemable preferred shares, outstanding (in shares) Temporary Equity, Shares Outstanding Financial Instrument [Axis] Financial Instrument [Axis] Segment Information Segment Reporting Disclosure [Text Block] Preferred stock, convertible, term Preferred Stock, Convertible, Term Preferred Stock, Convertible, Term Revenues: Disposal Group, Including Discontinued Operation, Revenue [Abstract] Disposal Group, Including Discontinued Operation, Revenue Net cash used in operating activities of discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Compensation expense under share incentive plans APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Loss Portfolio Transfer And Adverse Development Cover Reinsurance Transaction Loss Portfolio Transfer And Adverse Development Cover Reinsurance Transaction [Member] Loss Portfolio Transfer And Adverse Development Cover Reinsurance Transaction Entity Shell Company Entity Shell Company Measurement Basis [Axis] Measurement Basis [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Restricted cash equivalents Restricted cash equivalents at beginning of period Restricted cash equivalents at end of period Restricted Cash Equivalents Schedule of Dividends Dividends Declared [Table Text Block] Reinsurance recoverable on paid losses Reinsurance Recoverable for Paid Claims and Claims Adjustments Unsecured Debt Unsecured Debt [Member] Statement [Table] Statement [Table] Measurement Frequency [Domain] Measurement Frequency [Domain] Counterparty Name [Axis] Counterparty Name [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] City Area Code City Area Code Maturities, calls and paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Residential mortgage-backed Residential Mortgage Backed Amortized Cost Represents Amortized Cost of Residential mortgage-backed securities. Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Disposal Group Classification [Domain] Disposal Group Classification [Domain] Quoted Prices in Active Markets for Identical Assets Level 1 Fair Value, Inputs, Level 1 [Member] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Reinsurance, aggregate coverage limit Reinsurance, Aggregate Coverage Limit Reinsurance, Aggregate Coverage Limit Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Preferred stock Preferred Stock [Member] Exercisable, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] 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 Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Net realized investment losses Net realized investment losses on available-for-sale fixed maturities Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] 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] After five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Expenses: Disposal Group, Including Discontinued Operation, Expenses [Abstract] Disposal Group, Including Discontinued Operation, Expenses Subsequent Event Type [Axis] Subsequent Event Type [Axis] Total loss and loss adjustment expense payments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Investments Investment [Text Block] Net income (loss) per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Available-for-sale fixed maturity securities and equity securities Securities (Assets) [Member] Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Retained deficit Retained Earnings (Accumulated Deficit) Class of Stock [Domain] Class of Stock [Domain] Fixed maturity securities, at fair value Disposal Group, Including Discontinued Operation, Debt Securities, Available-For-Sale Disposal Group, Including Discontinued Operation, Debt Securities, Available-For-Sale Net Investment Income [Line Items] Net Investment Income [Line Items] Changes in fair values of equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Amortized Cost Represents amortized cost of commercial mortgage and asset-backed. 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) Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Number of underlying projects sold Number of Underlying Projects Sold Number of Underlying Projects Sold Proceeds from sales Proceeds from Sale of Equity Method Investments Bank loan participations, gross realized losses Bank Loan Participations, Gross Realized Loss Represents the gross realized losses on bank loan participations. Credit Facility [Axis] Credit Facility [Axis] Preferred stock, convertible, floor conversion price Preferred Stock, Convertible, Floor Conversion Price Preferred Stock, Convertible, Floor Conversion Price Total Amount Dividends, Common Stock, Cash Notes receivable two Notes Receivable Two [Member] Notes Receivable Two Amendment Flag Amendment Flag Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Carrying Value Reported Value Measurement [Member] Entity Registrant Name Entity Registrant Name Commercial mortgage and asset-backed Commercial Mortgage-Backed Securities [Member] Operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Changes in fair values of short-term investments and other Short Term Investments And Other, Changes in Fair Value Short Term Investments And Other, Changes in Fair Value Reinsurance recoverable on unpaid losses, net Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Excess and 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 Subsequent Events [Abstract] Subsequent Events [Abstract] Sales – equity securities Proceeds from Sale of Equity Securities, FV-NI Number of shares issued during period (in shares) Sale of Stock, Number of Shares Issued in Transaction Significant Other Observable Inputs Level 2 Fair Value, Inputs, Level 2 [Member] One year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Senior Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Geographical [Domain] Geographical [Domain] Percentage of available for sale securities Percentage Of Available For Sale Debt Securities Represents percentage of available for sale debt securities. Schedule of Gross Carrying Amounts for Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Loss Fund Trust Loss Fund Trust [Member] Loss Fund Trust Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of Share Based Compensation Expense and Related Tax Benefit Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Reinsurance premium Reinsurance Premium Reinsurance Premium Notes receivable one Notes Receivable One [Member] Notes Receivable One Dividend payable, record date Dividends Payable, Date of Record Title of 12(b) Security Title of 12(b) Security Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period Reinsurance Recoverables on Unpaid Losses, Gross Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Lapsed (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Lapsed in Period, Weighted Average Exercise Price Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Lapsed in Period, Weighted Average Exercise Price 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 Schedule of Other Operating Expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Accrued expenses Accrued Liabilities Fair Value Measurement [Domain] Fair Value Measurement [Domain] Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Fair Value Represents fair value of commercial mortgage and asset backed. Basic (in dollars per share) Earnings Per Share, Basic Other underwriting expenses of the operating segments Other Underwriting Expense Series A Preferred Shares Temporary Equity Disclosure [Text Block] Temporary Equity Disclosure Reinsurance Transaction [Axis] Reinsurance Transaction [Axis] Reinsurance Transaction Trademarks Trademarks [Member] Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting Policies Net income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Identifiable intangible assets subject to amortization Finite-Lived Intangible Assets, Net [Abstract] Unearned premiums Disposal Group, Including Discontinued Operation, Unearned Premiums Disposal Group, Including Discontinued Operation, Unearned Premiums Series A redeemable preferred shares – 2024 and 2023: $0.00125 par value; 20,000,000 shares authorized; 150,000 shares issued and outstanding Temporary Equity, Carrying Amount, Attributable to Parent Total assets Assets Cash distributions from LLCs Proceeds from Equity Method Investment, Distribution Renewable energy LLCs Renewable Energy Llcs [Member] Name of the investment category. Senior debt Amount outstanding on line of credit Senior debt Long-Term Line of Credit Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Number of trading days immediately preceding Mandatory Conversion Preferred Stock, Dividend, Trading Days Preferred Stock, Dividend, Trading Days U.S. Treasury securities and obligations guaranteed by the U.S. government US Treasury and Government [Member] Schedule of Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Other operating expenses Disposal Group, Including Discontinued Operation, Operating Expense Commitments and contingent liabilities (Note 8) Commitments and Contingencies Net written premiums Disposal Group, Including Discontinued Operation, Premiums Written, Net Disposal Group, Including Discontinued Operation, Premiums Written, Net Reclassification adjustment for investment losses realized in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Bank loan participations, gross realized gains Bank Loan Participations, Gross Realized Gain Represents the gross realized gains on bank loan participations. Total revenues Segment revenues Revenues Dividends on Series A preferred shares Dividends on Series A preferred shares Payments of Ordinary Dividends, Preferred Stock and Preference Stock Other liabilities Other Liabilities Entity Address, City or Town Entity Address, City or Town Pre close dividend, forgiveness Selling Agreement, Pre Close Dividend, Forgiveness Selling Agreement, Pre Close Dividend, Forgiveness Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] After one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Downward adjustment disputed Disposal Group, Including Discontinued Operation, Amounts Of Material Contingent Liabilities Remaining Disposal Group, Including Discontinued Operation, Amounts Of Material Contingent Liabilities Remaining Schedule of Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Common stock, covenant, threshold (in dollars per share) Common Stock, Covenant Threshold, Per Share Common Stock, Covenant Threshold, Per Share Payables to reinsurers Reinsurance Payable Share based compensation expense Share-Based Payment Arrangement, Expense Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Net income Net income Net Income (Loss) Attributable to Parent Schedule of Carrying Value and Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Private speciality credit Private Speciality Credit [Member] Private Speciality Credit Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Other Comprehensive (Loss) Income Comprehensive Income (Loss) Note [Text Block] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Business Acquisition [Axis] Business Acquisition [Axis] Schedule of Gross Carrying Amounts and Accumulated Amortization for Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Net written premiums Premiums Written, Net Renewable energy notes receivable Renewable Energy Bridge Financing Notes [Member] Name of the investment category. After ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 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. Total expenses Benefits, Losses and Expenses Entity File Number Entity File Number Schedule of Net Realized Gains and Losses on Investments Realized Gain (Loss) on Investments [Table Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Entity Address, Address Line Three Entity Address, Address Line Three Entity Address, Address Line Two Entity Address, Address Line Two Dividends on common shares Dividends, Common Stock Weighted-average common shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Profit commission percentage Profit Commission Percentage Profit Commission Percentage Document Period End Date Document Period End Date Sale of Stock [Axis] Sale of Stock [Axis] 2014 LTIP Long Term Incentive Plan 2014 [Member] Represents information regarding Long Term Incentive Plan 2014. Number of equity securities held Number Of Equity Securities Held Number Of Equity Securities Held Investment in LLC Investment In Llc [Member] Represents investment in LLC`s. 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 Equity securities, gross realized gains Equity Securities, FV-NI, Realized Gain Asset Class [Axis] Asset Class [Axis] (Loss) income from discontinued operations Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Change in restricted cash equivalents Increase (Decrease) In Restricted Cash Equivalents Increase (Decrease) In Restricted Cash Equivalents Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Dividends payable, date to be paid Dividends Payable, Date to be Paid Cost or Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Investment in variable interest entities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Current year Current Year Claims and Claims Adjustment Expense Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] After one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 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 Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Retained Deficit Retained Earnings [Member] Reserve for losses and loss adjustment expenses Disposal Group, Including Discontinued Operation, Reserve For Losses And Loss Adjustment Expenses Disposal Group, Including Discontinued Operation, Reserve For Losses And Loss Adjustment Expenses Cash paid to JRGH Payment For Selling Agreement, Pre Close Dividend Payment For Selling Agreement, Pre Close Dividend Net investment income Gross Investment Income, Operating Basic (in shares) Weighted Average Number of Shares Outstanding, Basic U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Net earned premiums Net earned premiums Premiums Earned, Net 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 RSUs RSUs Restricted Stock Units (RSUs) [Member] Fixed maturity securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Reinsurance Transaction [Domain] Reinsurance Transaction [Domain] Reinsurance Transaction [Domain] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Investment in private subordinated notes Other invested assets – notes receivable Notes Receivable Represents carrying value of notes receivable as on reporting date. Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period 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 Entity Filer Category Entity Filer Category Gross fee income Fee Income Cash Flows from Discontinued Operations Net Cash Provided by (Used in) Discontinued Operations [Abstract] Purchases – fixed maturity securities Payments to Acquire Debt Securities, Available-for-Sale Private Placement Private Placement [Member]