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Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Professional fees Professional Fees Purchase of illiquid investments Payments to Acquire Held-to-Maturity Securities and Equity Method Investments Payments to Acquire Held-to-Maturity Securities and Equity Method Investments Entity Shell Company Entity Shell Company Measurement Basis [Axis] Measurement Basis [Axis] Mortgage loans Mortgage Loans [Member] Mortgage Loans Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Mortgage loans Loans Receivable, Fair Value Disclosure Notes payable Notes Payable [Member] Notes Payable Title Trading Arrangement, Individual Title Statement [Table] Statement [Table] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Counterparty Name [Axis] Counterparty Name [Axis] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Other long-term investments Other Long-Term Investments City Area Code City Area Code Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Net unrealized (losses) gains on investments Net Unrealized Losses and Gains on Investments [Abstract] Net Unrealized Losses and Gains on Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Total Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss Statement of Cash Flows [Abstract] Preferred stock: Preferred stocks: Preferred Stock [Member] Investment Income Investment Income [Table Text Block] Useful life Equity Method Investment, Difference in Net Assets, Amortization Period Equity Method Investment, Difference in Net Assets, Amortization Period Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Fixed maturity securities, available-for-sale: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Income Taxes Income Tax Disclosure [Text Block] Other comprehensive income: Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Per share data: Earnings Per Share [Abstract] Stockholders’ equity Equity [Abstract] Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Related Party Transaction [Line Items] Related Party Transaction [Line Items] Net Investment Income [Line Items] Net Investment Income [Line Items] Other Loss on Sale of Other Investments Loss on Sale of Other Investments Equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Total gains for the period recognized in net investment (losses) gains attributable to the change in unrealized gains or losses relating to assets held as of period end Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Professional fees and reimbursements Professional Fees And Reimbursements [Member] Professional Fees And Reimbursements Credit Facility [Axis] Credit Facility [Axis] Amendment Flag Amendment Flag Long-term debt Long-Term Debt, Fair Value Carrying Value Reported Value Measurement [Member] Repayment of stock notes receivable Proceeds From Repayments Of Receivable From Shareholders Or Affiliates For Issuance Of Capital Stock Proceeds From Repayments Of Receivable From Shareholders Or Affiliates For Issuance Of Capital Stock Entity Registrant Name Entity Registrant Name Subordinated debt, net of debt issuance costs Subordinated Debt [Member] Commercial mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Repayment of trust preferred Payments for Repurchase of Trust Preferred Securities Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Less: reinsurance recoverable on unpaid claims, beginning of period Plus: reinsurance recoverable on unpaid claims, end of period Ceded unpaid losses and LAE Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Equity Method Investment, Nonconsolidated Investee or Group of Investees Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] Held-to-maturity, gross unrealized losses Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Accumulated Loss Fair Value as of Grant Date Award Grant Date Fair Value Affiliated entity Affiliated Entity [Member] Equity securities Proceeds from Sale of Equity Securities, FV-NI Level 2 Fair Value, Inputs, Level 2 [Member] Due in less than one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Notes Payable & Subordinated Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Face amount Debt Instrument, Face Amount Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Proceeds from equity offerings, net Stock Issued During Period, Value, New Issues Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Common stock, $0.01 par value, 500,000,000 shares authorized, 40,096,132 and 39,863,756 shares issued and outstanding, respectively Common Stock, Value, Issued Schedule of Underwriting, Acquisition and Insurance Expenses Schedule Of Underwriting, Acquisition and Insurance Expenses [Table Text Block] Schedule Of Underwriting, Acquisition and Insurance Expenses U.S. government securities US Government Debt Securities [Member] Net interest rate Debt Instrument, Interest Rate During Period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Available-for-sale and held-to-maturity, gross unrealized losses Debt Securities, Available-for-Sale And Held-to-Maturity, Unrealized Loss Position, Accumulated Loss [Abstract] Debt Securities, Available-for-Sale And Held-to-Maturity, Unrealized Loss Position, Accumulated Loss Revolving Line Of Credit Due December 2023 Revolving Line Of Credit Due December 2023 [Member] Revolving Line Of Credit Due December 2023 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] Equity method investments, unfunded commitment Equity Method Investments, Unfunded Commitment Equity Method Investments, Unfunded Commitment Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Gross Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Fair Value Measurement [Domain] Fair Value Measurement [Domain] Basic earnings (loss) per share (in dollar per share) Earnings Per Share, Basic Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Employee share purchases Proceeds from Stock Plans Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Agreement, ownership interest Related Party, Ownership Interest Related Party, Ownership Interest Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Total Realized Investment Losses Realized Investment Losses Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total assets Assets Written Premiums Written, Gross [Abstract] Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Total fixed maturity securities, held-to-maturity Debt Securities, Held-to-Maturity, Fair Value Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Equity Method Investments and Other Equity Method Investments and Joint Ventures Disclosure [Text Block] Reclassification adjustment for losses on securities no longer held, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Termination Date Trading Arrangement Termination Date Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Assumed premiums Assumed Premiums Written Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total revenues Revenues Held-to-maturity, fair value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position [Abstract] Allowance for credit losses Allowance for Credit Losses Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Entity Address, City or Town Entity Address, City or Town Proceeds from long-term debt Amount Proceeds from Issuance of Long-Term Debt Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Debt Instrument [Axis] Debt Instrument [Axis] Loss portfolio transfer Reinsurance Recoverable For Loss Portfolio Transfer Reinsurance Recoverable For Loss Portfolio Transfer Reinsurance and premium payables Reinsurance Payable Net income Net income Net income Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Investments, Debt and Equity Securities [Abstract] Preferred stock conversion to common shares Stock Issued During Period, Value, Conversion of Convertible Securities Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Gross Unrealized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Net premiums Premiums Written, Net Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 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] Fixed maturity securities, available-for-sale: Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Total expenses Benefits, Losses and Expenses Entity File Number Entity File Number Junior Subordinated Notes Due 2036, Common Stock Junior Subordinated Notes Due 2036, Common Stock [Member] Junior Subordinated Notes Due 2036, Common Stock Commercial Commercial Portfolio Segment [Member] Commission and Fee Income Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Dowling Capital Partners LP units Dowling Capital Partners LP [Member] Dowling Capital Partners LP Entity Address, Address Line Two Entity Address, Address Line Two Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total Assets, Fair Value Disclosure Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Without single maturity date Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Equity securities Equity Securities, FV-NI, Realized Gain Asset Class [Axis] Asset Class [Axis] Insider Trading Arrangements [Line Items] Net change in unrealized (losses) gains on investments, net of tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax Gross Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Contract asset after allowance for credit loss Contract with Customer, Asset, after Allowance for Credit Loss Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Adjustment to Compensation: Adjustment to Compensation [Axis] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Current period Current Year Claims and Claims Adjustment Expense Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Gain (Loss) on Securities Gain (Loss) on Securities [Table Text Block] Retained earnings (accumulated deficit): Retained Earnings [Member] Restricted cash Restricted Cash and Cash Equivalents Proceeds from initial public offering Proceeds from Issuance Initial Public Offering Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Total investment income Gross Investment Income, Operating Related Party [Axis] Related and Nonrelated Parties [Axis] Basic (in shares) Basic weighted-average common shares (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net earned premiums Net premiums Net earned premium Premiums Earned, Net Fixed maturity securities, held-to-maturity Fixed Maturity Securities, Held-to-Maturity [Member] Fixed Maturity Securities, Held-to-Maturity 12 Months or More Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Entity Filer Category Entity Filer Category Purchase of fixed maturity securities, available-for-sale Payments to Acquire Debt Securities, Available-for-Sale Letter of Credit Letter of Credit [Member] Company Selected Measure Name Company Selected Measure Name Accounting Standards Update 2016-13 [Member]