Income Tax Disclosure [Abstract] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Discounted unpaid losses and loss adjustment expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves Unearned premiums Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Domestic Net unrealized losses on investments Deferred Tax Assets, Unrealized Losses on Securities Deferred Tax Assets, Unrealized Losses on Securities State net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, State and Local Deferred gain from ADC Deferred Tax Assets, Reinsurance Recoverables, Deferred Gain, Net of Accretion and Amortization Deferred Tax Assets, Reinsurance Recoverables, Deferred Gain, Net of Accretion and Amortization Other Deferred Tax Assets, Other Gross deferred tax assets Deferred Tax Assets, Gross Less valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets, net of allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Investment basis difference Deferred Tax Liabilities, Investments Net unrealized gains on investments Deferred Tax Liabilities, Unrealized Gains (Losses) on Investments Deferred Tax Liabilities, Unrealized Gains (Losses) on Investments Deferred policy acquisition costs Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost Intangible assets Deferred Tax Liabilities, Intangible Assets Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax liability Deferred Tax Liabilities, Net Quarterly Financial Information Disclosure [Abstract] Summary of Quarterly Financial Results Quarterly Financial Information [Table Text Block] Reinsurance Disclosures [Abstract] Written premiums: Premiums Written, Net [Abstract] Direct Direct Premiums Written Assumed Assumed Premiums Written Ceded Ceded Premiums Written Net written premiums Premiums Written, Net Earned premiums: Premiums Earned, Net [Abstract] Direct Direct Premiums Earned Assumed Assumed Premiums Earned Ceded Ceded Premiums Earned Net earned premiums Premiums Earned, Net Loss and loss adjustment expenses: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Direct Direct Claims And Claims Adjustment Expense Amount of expense for direct claims incurred. Assumed Assumed Claims And Claims Adjustment Expense Amount of expense for assumed claims incurred. Ceded Ceded Claims And Claims Adjustment Expense Amount of expense for ceded claims incurred. Net Loss and loss adjustment expenses Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Percentage of Assumed Written Premiums to Net Written Premiums SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of bond premium and discount, net Amortization of Debt Discount (Premium) Net realized investment gains Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment Net realized investment gains Gain (Loss) on Investments, Excluding Other than Temporary Impairments Change in fair value of equity securities Equity Securities, FV-NI, Gain (Loss) Restricted stock unit expenses Share-based Compensation Other Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Premiums, agents' balances and other receivables Increase (Decrease) in Premiums Receivable Reinsurance recoverables Increase (Decrease) in Reinsurance Recoverable Prepaid reinsurance premiums Increase (Decrease) in Prepaid Reinsurance Premiums Deferred policy acquisition costs Increase (Decrease) in Deferred Policy Acquisition Costs Other assets Increase (Decrease) in Other Operating Assets Unpaid losses and loss adjustment expenses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Unearned premiums Increase (Decrease) in Unearned Premiums Reinsurance premiums payable Increase (Decrease) in Reinsurance Payables Accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Purchases of investments Payments to Acquire Investments Proceeds from maturities and redemptions of investments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Proceeds from sales of investments Proceeds From Sale Of Short-Term Investments And Available For Sale Securities Proceeds From Sale Of Short-Term Investments And Available For Sale Securities Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows From Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Proceeds received from issuance of shares of common stock Proceeds from Issuance of Common Stock Repurchase of common stock Payments for Repurchase of Common Stock Borrowings under debt arrangements Proceeds from Long-term Lines of Credit Repayment of borrowings under debt arrangements Repayments of Long-term Lines of Credit Stock and debt issuance costs Payments of Debt Issuance Costs Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash Cash and Cash Equivalents, Period Increase (Decrease) Cash at beginning of period Cash and Cash Equivalents, at Carrying Value Cash at end of period Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Net income taxes paid (refunded) Income Taxes Paid, Net Increase (decrease) in net payable for securities Payable for Securities, Noncash Payable for Securities, Noncash Income Statement [Abstract] Revenue Revenues [Abstract] Gross earned premiums Direct and Assumed Premiums Earned Direct and Assumed Premiums Earned Ceded earned premiums Net investment income Net Investment Income Net realized investment gains Realized Investment Gains (Losses) Change in fair value of equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Other gains (losses) Other Nonoperating Gains (Losses) Other income Other Income Total revenue Revenues Expenses Benefits, Losses and Expenses [Abstract] Losses and loss adjustment expenses, net Policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Operating expenses Operating Expenses Interest expense Interest Expense Total expenses Benefits, Losses and Expenses Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) Equity earnings (losses) in affiliates, net of tax Income (Loss) from Equity Method Investments Net income (loss) Net income (loss) per share, basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Weighted average common shares outstanding, basic and diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Schedule V - Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Vesting Schedule for Restricted Stock Units Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest [Table Text Block] Gross written premiums Premiums Written, Gross Net written premiums Net earned premiums Net realized gains (losses) Change in fair value of equity securities Losses and loss adjustment expenses, net Income tax expense (benefit) Diluted earnings (loss) per common share (in dollars per share) Earnings Per Share, Diluted Combined ratio (percentage) Combined Ratio Insurance Loss Reserves [Abstract] Unpaid Losses and Loss Adjustment Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Reinsurance Reinsurance [Text Block] Income Taxes Income Tax Disclosure [Text Block] Investments, Debt and Equity Securities [Abstract] Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Short-duration Insurance Contracts, Historical Claims Duration [Table] Short-duration Insurance Contracts, Historical Claims Duration [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Commercial Lines Property and Casualty, Commercial Insurance Product Line [Member] Personal Lines Property and Casualty, Personal Insurance Product Line [Member] Short-duration Insurance Contracts, Historical Claims Duration [Line Items] Short-duration Insurance Contracts, Historical Claims Duration [Line Items] Year 1 Short-duration Insurance Contracts, Historical Claims Duration, Year One Year 2 Short-duration Insurance Contracts, Historical Claims Duration, Year Two Year 3 Short-duration Insurance Contracts, Historical Claims Duration, Year Three Year 4 Short-duration Insurance Contracts, Historical Claims Duration, Year Four Year 5 Short-duration Insurance Contracts, Historical Claims Duration, Year Five Year 6 Short-duration Insurance Contracts, Historical Claims Duration, Year Six Year 7 Short-duration Insurance Contracts, Historical Claims Duration, Year Seven Year 8 Short-duration Insurance Contracts, Historical Claims Duration, Year Eight Year 9 Short-duration Insurance Contracts, Historical Claims Duration, Year Nine Year 10, and onwards Short-duration Insurance Contracts, Historical Claims Duration, Year Ten and Thereafter Short-duration Insurance Contracts, Historical Claims Duration, Year Ten and Thereafter Schedule of Available-for-sale Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Securities in Unrealized Loss Positions Schedule of Unrealized Loss on Investments [Table Text Block] Summary of Investment Income Investment Income [Table Text Block] Summary of Gross Realized Gains and Losses on Securities Realized Gain (Loss) on Investments [Table Text Block] Summary of Amortized Cost and Fair Value of Securities Investments Classified by Contractual Maturity Date [Table Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior unsecured notes Senior Notes [Member] Subordinated Debt Subordinated Debt [Member] Line of credit Line of Credit [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Long-term Debt Condensed Financial Information Disclosure [Abstract] Schedule II - Condensed Financial Information of Registrant - Statement of Cash Flows Condensed Financial Information of Parent Company Only Disclosure [Text Block] Earnings Per Share [Abstract] Net income (loss) Earnings (loss) per share allocable to common, basic and diluted (in dollars per share) Statement of Financial Position [Abstract] Assets Assets [Abstract] Debt securities, at fair value (amortized cost of $122,678 and $137,004, respectively) Debt Securities, Available-for-sale Equity securities, at fair value (cost of $9,559 and $8,629, respectively) Equity Securities, FV-NI Equity securities, at fair value (cost of $9,559 and $8,629, respectively) Available-for-sale Securities, Equity Securities Short-term investments, at fair value Short-term Investments Total investments Investments Cash Cash Premiums and agents' balances receivable, net Premiums Receivable, Net Receivable from Affiliate Due from Affiliates Reinsurance recoverables on unpaid losses Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Reinsurance recoverables on paid losses Reinsurance Recoverable for Paid Claims and Claims Adjustments Prepaid reinsurance premiums Ceded unearned premiums Premium paid, but not yet earned, to reinsurers under reinsurance treaties to transfer a portion of the insurer's risk. Deferred policy acquisition costs Deferred Policy Acquisition Costs Other assets Other Assets Total assets Assets Liabilities and Shareholders' Equity Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Unpaid losses and loss adjustment expenses Liability for Claims and Claims Adjustment Expense Unearned premiums Unearned Premiums Reinsurance premiums payable Reinsurance Payable Debt Deferred gain on ADC Reinsurance Recoverables, Deferred Gain, Net Of Accretion And Amortization Reinsurance Recoverables, Deferred Gain, Net Of Accretion And Amortization Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Total liabilities Liabilities Commitment and contingencies Commitments and Contingencies Shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, no par value (100,000,000 shares authorized; 8,478,202 and 8,520,328 issued and outstanding, respectively) Common Stock, Value, Issued Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and shareholders' equity Liabilities and Equity Document And Entity Information Entity Registrant Name Entity Central Index Key Trading Symbol Current Fiscal Year End Date Entity Filer Category Entity Well-known Seasoned Issuer Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Voluntary Filers Entity Current Reporting Status Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Document Type Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Entity Shell Company Entity Shell Company Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized investment gains (losses): Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract] Unrealized investment gains (losses) during the period Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Income tax expense (benefit) Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Unrealized investment gains (losses), net of tax Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Less: reclassification adjustments to: Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract] Net realized investment gains (losses) included in net income (loss) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Income tax expense (benefit) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Total reclassifications included in net income (loss), net of tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table] Commercial Lines Commercial Lines [Member] The commercial lines segment which offers coverage for property, liability, automobile and other miscellaneous coverage primarily to owner-operated small and mid-sized businesses, professional organizations and hospitality businesses such as restaurant, bars and taverns. Personal Lines Personal Lines [Member] Personal lines segment which offers coverage for low-value dwelling, wind-exposed homeowners and automobile. Included within personal insurance business are the following key products Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] Unpaid losses and ALAE, net of reinsurance Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net ULAE Expense Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense Proceeds from sales of available for sale securities Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from sales of available for sale securities Proceeds from Sale of Available-for-sale Securities Deposits in trust accounts to meet requirements of state insurance departments Deposits, Held In Trust For State Insurance Departments Funds held in trust accounts to meet deposit requirements by state insurance departments. Deposits in trust accounts to meet collateral requirements with reinsurers Deposits, Held In Trust For Collateral Requirements Deposits, Held In Trust For Collateral Requirements Deferred Policy Acquisition Costs Disclosures [Abstract] Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Text Block] Fair Value Disclosures [Abstract] Summary of Assets and Liabilities Measured at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Investment Income [Table] Investment Income [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Debt securities Debt Securities [Member] Equity securities Equity Securities [Member] Cash and short-term investments Cash and Cash Equivalents [Member] Net Investment Income [Line Items] Net Investment Income [Line Items] Investment income Gross Investment Income, Operating Investment expenses Investment Income, Investment Expense Net investment income Earnings Per Share Earnings Per Share [Text Block] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Stock Repurchase Program, December 2018 Stock Repurchase Program, December 2018 [Member] Stock Repurchase Program, December 2018 [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Stock repurchased during period, shares (in shares) Stock Repurchased During Period, Shares Stock repurchased during period, price (in USD per share) Share Repurchased During Period, Average Cost Per Share Share Repurchased During Period, Average Cost Per Share Stock repurchased during period, value Stock Repurchased During Period, Value Commitments and Contingencies Disclosure [Abstract] Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Partnership Interest Partnership Interest [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Levles 1, 2 and 3 Fair Value, Inputs, Level 1, 2 and 3 [Member] Fair Value Measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] U.S. Government US Government Agencies Debt Securities [Member] State and local government US States and Political Subdivisions Debt Securities [Member] Corporate debt Corporate Debt Securities [Member] Asset-backed securities Asset-backed Securities [Member] Mortgage-backed securities Collateralized Mortgage Backed Securities [Member] Commercial mortgage-backed securities Commercial Mortgage Backed Securities [Member] Collateralized mortgage obligations Collateralized Debt Obligations [Member] Equity Securities Senior Unsecured Notes Subordinated Notes Senior Debt Obligations [Member] 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] Debt Securities Equity Securities Equity Securities Short-term investments Investment in limited partnership Alternative Investment Total assets measured at fair value Assets, Fair Value Disclosure Debt Debt Instrument, Fair Value Disclosure Total Liabilities measured at fair value Financial and Nonfinancial Liabilities, Fair Value Disclosure Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2015 Omnibus Incentive Plan 2015 Omnibus Incentive Plan [Member] Represents the 2015 Omnibus Incentive Plan. Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Units Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Beginning period, outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Units granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Units vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Units forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending period, outstanding (in shares) 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] Beginning period, outstanding (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 Units 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 Units 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 Units 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 Ending period, outstanding (in dollars per share) Schedule of the Changes in the Reserves for Losses and Loss Adjustment Expense Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Short-duration Insurance Contracts, Claims Development Short-duration Insurance Contracts, Claims Development [Table Text Block] Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block] Loss Duration Schedule Short-duration Insurance Contracts, Schedule of Historical Claims Duration [Table Text Block] Marketable Securities [Table] Marketable Securities [Table] Marketable Securities [Line Items] Marketable Securities [Line Items] Gross realized gains Available-for-sale Securities, Gross Realized Gains Debt securities, Gross realized gains Debt Securities, Available-for-sale, Realized Gain Equity securities, Gross realized gains Equity Securities, FV-NI, Realized Gain Gross realized losses Available-for-sale Securities, Gross Realized Losses Debt securities, Gross realized losses Debt Securities, Available-for-sale, Realized Loss Equity securities, Gross realized losses Equity Securities, FV-NI, Realized Loss Total debt securities Debt Securities, Available-for-sale, Realized Gain (Loss) Total equity securities Equity Securities, FV-NI, Realized Gain (Loss) Total net realized investment gains Available-for-sale Securities, Gross Realized Gain (Loss) Total net investment realized gains Marketable Securities, Realized Gain (Loss) Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Domestic Tax Authority UNITED STATES State Tax Authority State and Local Jurisdiction [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Internal Revenue Service (IRS) Internal Revenue Service (IRS) [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Current income taxes receivable Income Taxes Receivable, Current Reduction in deferred tax expense related to loss reserve discounting Tax Cuts and Jobs Act, Loss Reserve Discounting, Income Tax Expense (Benefit) Tax Cuts and Jobs Act, Loss Reserve Discounting, Income Tax Expense (Benefit) Increase in deferred tax expense related to transitional loss reserve discounting Tax Cuts and Jobs Act, Transitional Loss Reserve Discounting, Income Tax Expense (Benefit) Tax Cuts and Jobs Act, Transitional Loss Reserve Discounting, Income Tax Expense (Benefit) Net operating loss carryforwards Operating Loss Carryforwards Net operating loss carryforwards, subject to expiration Operating Loss Carryforwards, Subject to Expiration Operating Loss Carryforwards, Subject to Expiration Net operating loss carryforwards, not subject to expiration Operating Loss Carryforwards, Not Subject to Expiration Operating Loss Carryforwards, Not Subject to Expiration Net operating loss carryforwards subject to limitations Operating Loss Carryforwards, Subject to Limitations Operating Loss Carryforwards, Subject to Limitations Valuation allowance Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company Parent Company [Member] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Investment in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Due from subsidiaries Due from Related Parties Due from affiliate Total assets Other liabilities Other Liabilities Shareholders' equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock, no par value (100,000,000 shares authorized; 8,478,202 and 8,520,328 issued and outstanding, respectively) Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] 2019 Share-based Compensation Award, Tranche One [Member] 2020 Share-based Compensation Award, Tranche Two [Member] 2021 Share-based Compensation Award, Tranche Three [Member] 2022 Share-based Compensation Award, Tranche Four [Member] Share-based Compensation Award, Tranche Four [Member] 2023 Share-based Compensation Award, Tranche Five [Member] Share-based Compensation Award, Tranche Five [Member] Scheduled vesting - RSUs (in shares) Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Guarantee of debt Financial Guarantee [Member] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Dividends received from subsidiaries during period SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees Guarantee obligation Guarantor Obligations, Maximum Exposure, Undiscounted Interest rate Debt Instrument, Interest Rate, Stated Percentage Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Corporate & Other Corporate, Non-Segment [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net written premiums Net earned premiums Segment revenue Revenue From Earned Premiums And Other Income, Net Revenue From Earned Premiums And Other Income, Net Segment expenses Benefits, Losses and Expenses, Excluding Interest Expense Benefits, Losses and Expenses, Excluding Interest Expense Segment underwriting gain (loss) Operating Income (Loss) Investment income Interest expense Loss and loss adjustment expense reserves Schedule of Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-01 Accounting Standards Update 2016-01 [Member] Accounting Standards Update 2018-02 Accounting Standards Update 2018-02 [Member] Accounting Standards Update 2018-02 [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] No Par, Common Stock Common Stock [Member] Retained Earnings (Accumulated deficit) Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance (in shares) Shares, Outstanding Balance at beginning of period Cumulative effect of adoption of ASU Cumulative Effect of New Accounting Principle in Period of Adoption Balances after cumulative effects Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance Repurchase of common stock (in shares) Stock Repurchased and Retired During Period, Shares Repurchase of common stock Stock Repurchased and Retired During Period, Value Issuance of common stock in private placement (in shares) Stock Issued During Period, Shares, New Issues Issuance of common stock in private placement Stock Issued During Period, Value, New Issues Common stock issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Restricted stock units expense (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Restricted stock units expense Stock Issued During Period, Value, Restricted Stock Award, Gross Other comprehensive income (loss) Balance (in shares) Balance at end of period Effects of Reinsurance [Table] Effects of Reinsurance [Table] Catastrophic Event [Axis] Catastrophic Event [Axis] Catastrophic Event [Domain] Catastrophic Event [Domain] Hurricane Hurricane [Member] Commercial Liability Line Commercial Liability Line [Member] Commercial Liability Line [Member] Commercial Property Line Commercial Property Line [Member] Commercial Property Line [Member] Homeowners Lines Property product line Property, Liability and Casualty Insurance Product Line [Member] Other insurance product line Other Insurance Product Line [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Reinsurance Policy, Type [Axis] Reinsurance Policy, Type [Axis] Reinsurance Policy [Domain] Reinsurance Policy [Domain] Workers Compensation and Casualty Clash Workers Compensation and Casualty Clash [Member] Workers Compensation and Casualty Clash [Member] Property Reinsurance Policy Property Reinsurance Policy [Member] Property Reinsurance Policy [Member] Multiple Line Reinsurance Policy Multiple Line Reinsurance Policy [Member] Multiple Line Reinsurance Policy [Member] Quota Share Reinsurance Agreement Quota Share Reinsurance Agreement [Member] Represents the quota share reinsurance agreement. Adverse Development Cover Reinsurance Agreement Adverse Development Cover Reinsurance Agreement [Member] Adverse Development Cover Reinsurance Agreement [Member] Quota Share Reinsurance Agreement, Other Arrangements Quota Share Reinsurance Agreement, Other Arrangements [Member] Arrangement with another reinsurer for the small number of equipment breakdown, employment practices liability and data compromise and identity recovery Insurance Fronting Arrangement Insurance Fronting Arrangement [Member] Insurance fronting arrangements with unaffiliated issuers. Effects of Reinsurance [Line Items] Effects of Reinsurance [Line Items] Amount retained (excess of) Reinsurance Retention Policy, Amount Retained Amount reinsured Reinsurance Retention Policy, Excess Retention, Amount Reinsured Reinsurance retention policy carried reserves threshold Reinsurance Retention Policy, Excess Retention, Carried Reserves, Threshold Reinsurance Retention Policy, Excess Retention, Carried Reserves, Threshold Insured property value Reinsurance Retention Policy, Insured Property Value Threshold Reinsurance Retention Policy, Insured Property Value Threshold Consideration for reinsurance Payments for Reinsurance Reinsurance agreement, quota share (percentage) Reinsurance Retention Policy, Reinsured Risk, Percentage Contingent recovery (percentage) Contingent Recovery, Percentage Contingent Recovery, Percentage Assumed premiums written Ceded premium written Ceded premiums earned Short-duration Insurance Contracts, Claims Development [Table] Short-duration Insurance Contracts, Claims Development [Table] Short-duration Insurance Contracts, Accident Year [Axis] Short-duration Insurance Contracts, Accident Year [Axis] Short-duration Insurance Contracts, Accident Year [Domain] Short-duration Insurance Contracts, Accident Year [Domain] Accident Year 2009 Short-duration Insurance Contracts, Accident Year 2009 [Member] Accident Year 2010 Short-duration Insurance Contracts, Accident Year 2010 [Member] Accident Year 2011 Short-duration Insurance Contracts, Accident Year 2011 [Member] Accident Year 2012 Short-duration Insurance Contracts, Accident Year 2012 [Member] Accident Year 2013 Short-duration Insurance Contracts, Accident Year 2013 [Member] Accident Year 2014 Short-duration Insurance Contracts, Accident Year 2014 [Member] Accident Year 2015 Short-duration Insurance Contracts, Accident Year 2015 [Member] Accident Year 2016 Short-duration Insurance Contracts, Accident Year 2016 [Member] Accident Year 2017 Short-duration Insurance Contracts, Accident Year 2017 [Member] Accident Year 2018 Short-duration Insurance Contracts, Accident Year 2018 [Member] Claims Development [Line Items] Claims Development [Line Items] Incurred Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net Total IBNR Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net Cumulative number of reported claims Short-duration Insurance Contract, Cumulative Number of Reported Claims Cumulative Paid Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net Unpaid losses and ALAE - years 2009 through 2018 Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Excluding Not Separately Presented Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Excluding Not Separately Presented Unpaid losses and ALAE - prior to 2009 Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented Unpaid ADC Short-Duration Insurance Contracts, Liability For Unpaid Claims And Claim Adjustment Expense, Adverse Development Cover Reinsurance Short-Duration Insurance Contracts, Liability For Unpaid Claims And Claim Adjustment Expense, Adverse Development Cover Reinsurance Fixed maturity securities, amortized cost Debt Securities, Available-for-sale, Amortized Cost Equity securities, amortized cost Equity Securities, FV-NI, Cost Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Debt Instrument, Redemption, Period Two Debt Instrument, Redemption, Period Two [Member] Debt Instrument, Redemption, Period Three Debt Instrument, Redemption, Period Three [Member] Variable Rate Period [Axis] Variable Rate Period [Axis] Variable Rate Period [Axis] Variable Rate Period [Domain] Variable Rate Period [Domain] [Domain] for Variable Rate Period [Axis] Period One Period One [Member] Period One [Member] Period Two Period Two [Member] Period Two [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Swap rate Federal Funds Effective Swap Rate [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Unsecured Notes Senior Unsecured Notes Effective September 2018 [Member] Senior Unsecured Notes Effective September 2018 [Member] Private placement, subordinated note Private Placement Subordinated Note [Member] Private Placement Subordinated Note [Member] Number of debt instruments Debt Instrument, Number of Instruments Debt Instrument, Number of Instruments Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Face amount of debt Debt Instrument, Face Amount Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Debt issued Proceeds from Issuance of Debt Debt repaid Repayments of Debt Call premium Redemption Premium Call premium percentage Redemption Premium, Percentage Redemption Premium, Percentage Loan origination fee Payments of Financing Costs Debt term Debt Instrument, Term Debt issuance costs Debt Issuance Costs, Net Variable interest rate Debt Instrument, Basis Spread on Variable Rate Derivative, basis spread on variable rate Derivative, Basis Spread on Variable Rate Condensed Statement of Comprehensive Income [Table] Condensed Statement of Comprehensive Income [Table] Management fees from subsidiaries Management Service [Member] Condensed Statement of Income Captions [Line Items] Condensed Statement of Income Captions [Line Items] Revenue Income (loss) before equity in earnings (losses) of subsidiaries and income tax expense (benefit) Income (Loss) from Continuing Operations, before Income Taxes and Income (Loss) From Subsidiaries Income (Loss) from Continuing Operations, before Income Taxes and Income (Loss) From Subsidiaries Income (loss) before equity earnings (losses) of subsidiaries Income (Loss) from Continuing Operations, before Income (Loss) From Subsidiaries, Net of Tax Income (Loss) from Continuing Operations, before Income (Loss) From Subsidiaries, Net of Tax Equity earnings (losses) in subsidiaries Income (Loss) from Subsidiaries, Net of Tax Other Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Equity in other comprehensive income (loss) of subsidiaries Schedule II - Condensed Financial Information of Registrant - Balance Sheets Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Less: amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Summary of Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Table Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Gross Written Premiums Gross Written Premiums [Member] Represents gross written premiums. Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic Concentration Risk Geographic Concentration Risk [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Florida, Michigan, Texas and Pennsylvania Florida, Michigan, Texas and Pennsylvania [Member] Represents the states Florida, Michigan, Texas and Pennsylvania. Number of reportable segments Number of Reportable Segments Concentration percentage Concentration Risk, Percentage Fair Value, Concentration of Risk [Table] Fair Value, Concentration of Risk [Table] Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] Percentage of the fair value of the total investment portfolio (percentage) Investment Portfolio Percentage Represents a percentage of the investment portfolio. Insurance [Abstract] Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] CIC Conifer Insurance [Member] Conifer Insurance [Member] WPIC White Pines [Member] White Pines [Member] Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Statutory capital and surplus Statutory Accounting Practices, Statutory Capital and Surplus, Balance RBC authorized control level Statutory Accounting Practices, Risk Based Capital Requirements, Authorized Control Level Statutory Accounting Practices, Risk Based Capital Requirements, Authorized Control Level Statutory net income (loss) Statutory Accounting Practices, Statutory Net Income Amount RBC % Statutory Accounting Practices, Risk Based Capital, Percentage Statutory Accounting Practices, Risk Based Capital, Percentage SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Valuation for Deferred Tax Assets SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Charged to Expense SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Decrease to Other Comprehensive Income SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Deductions from Allowance Account SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Balance at End of Period Current tax expense (benefit) Current Income Tax Expense (Benefit) Deferred tax expense (benefit) Deferred Income Tax Expense (Benefit) Total income tax expense (benefit) Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Gross reserves - beginning of period Less: reinsurance recoverables on unpaid losses Net reserves - beginning of period Liability for Unpaid Claims and Claims Adjustment Expense, Net Add: incurred losses and loss adjustment expenses, net of reinsurance Current period Current Year Claims and Claims Adjustment Expense Prior period Prior Year Claims and Claims Adjustment Expense Deduct: loss and loss adjustment expense payments, net of reinsurance Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Current period Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Prior period Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Total net loss and loss adjustment expense payments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Net reserves - end of period Plus: reinsurance recoverables on unpaid losses Less: deferred gain on ADC Gross reserves - end of period Schedule II - Condensed Financial Information of Registrant - Statements of Comprehensive Income (Loss) Less than 12 months, number of issues Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Less than 12 months, number of issues Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year Greater than 12 months, number of issues Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Greater than 12 months, number issues Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year Number of issues Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Number of issues Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Less than 12 months, fair value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Less than 12 months, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Greater than 12 months, fair value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Greater than 12 months, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Less than 12 months, gross unrealized losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Less than 12 months, gross unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Greater than 12 months, gross unrealized losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Greater than 12 months, gross unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Gross unrealized losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Gross unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss U.S. federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, Amount [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Income (loss) before income taxes Statutory U.S. federal income tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Tax‑exempt investment income and dividend received deduction Effective Income Tax Rate Reconciliation, Tax Exempt Investment Income and Dividend Deduction, Amount Effective Income Tax Rate Reconciliation, Tax Exempt Investment Income and Dividend Deduction, Amount Nondeductible meals and entertainment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount Valuation allowance on deferred tax assets Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Change in federal tax rate Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Effective tax rate Effective Income Tax Rate Reconciliation, Percent Debt Long-term Debt [Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Retirement Benefits [Abstract] Minimum employee contribution amount, percentage of gross compensation Defined Contribution Plan, Minimum Annual Contributions Per Employee, Percent Defined Contribution Plan, Minimum Annual Contributions Per Employee, Percent Maximum employee contribution amount, percentage of gross compensation Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Employee matching contribution, percentage of employee gross compensation Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Plan expense Defined Contribution Plan, Cost Schedule of Outstanding Senior Debt Schedule of Debt [Table Text Block] Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Schedule of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Summary of Income Tax Expense (Benefit) Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Information by Reportable Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Stockholders' Equity Note [Abstract] Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Basis of Presentation and Management Representation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash and Short-term Investments Cash and Cash Equivalents, Policy [Policy Text Block] Investment Securities and Other-than-temporary Impairments Marketable Securities, Policy [Policy Text Block] Recognition of Premium Revenues Insurance Premiums Revenue Recognition, Policy [Policy Text Block] Reinsurance Reinsurance Accounting Policy [Policy Text Block] Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs, Policy [Policy Text Block] Unpaid Losses and Loss Adjustment Expenses Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Other Income Other Income, Policy [Policy Text Block] Other Income, Policy [Policy Text Block] Operating Expenses Operating Expenses, Policy [Policy Text Block] Operating Expenses, Policy [Policy Text Block] Recently Issued Accounting Guidance New Accounting Pronouncements, Policy [Policy Text Block] Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Number of shares issued upon conversion, per share (in shares) Conversion of Stock, Number of Shares Issued Upon Conversion Conversion of Stock, Number of Shares Issued Upon Conversion Stock issued during period (in shares) Stock granted, value Stock Granted, Value, Share-based Compensation, Gross Compensation expense Allocated Share-based Compensation Expense Total compensation cost not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Amortization and Accretion, Net Equity in undistributed (income) loss of subsidiaries Incentive awards expenses - vesting of RSUs Due from subsidiaries Increase (Decrease) in Due from Related Parties Due from affiliates Increase (Decrease) Due from Affiliates Current income tax recoverable Increase (Decrease) in Income Taxes Receivable Other assets Other liabilities Increase (Decrease) in Other Operating Liabilities Cash Flows From Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Contributions to subsidiaries Payments to Acquire Businesses and Interest in Affiliates Dividends received from subsidiaries Purchases of investments Payments for (Proceeds from) Investments Purchases of property and equipment Cash Flows From Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Repayment of borrowings under debt arrangements Stock and debt issuance costs Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Elements [Abstract] Interest paid Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Amortized Cost Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Due after ten years Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Securities with contractual maturities Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Securities without contractual maturities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Debt securities, Cost or Amortized Cost Estimated Fair Value Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Due after ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Securities with contractual maturities Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Securities without contractual maturities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Debt securities, Estimated Fair Value Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Subsequent Events Subsequent Events [Text Block] Employee Benefit Plans Defined Contribution Plan Disclosures [Table Text Block] Net Earned Premium Net Earned Premiums [Member] Represents net premiums earned. Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Other Commitments [Table] Other Commitments [Table] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Agreement to Design and Implement New Systems Agreement to Design and Implement New Systems [Member] Agreement to Design and Implement New Systems [Member] Other Commitments [Line Items] Other Commitments [Line Items] Minimum monthly payment Other Commitment, Minimum Monthly Payment Other Commitment, Minimum Monthly Payment Number of lease renewal options Lessee Leasing Arrangements, Operating Leases, Number of Lease Renewals Lessee Leasing Arrangements, Operating Leases, Number of Lease Renewals Lease renewal term Lessee, Operating Lease, Renewal Term Rent expense under operating leases Operating Leases, Rent Expense, Net Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years 2024 and thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future minimum rental payments Operating Leases, Future Minimum Payments Due Debt securities: Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Debt securities, Gross Unrealized Gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Debt securities, Gross Unrealized Loss Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Equity securities, Cost or Amortized Cost Available-for-sale Equity Securities, Amortized Cost Basis Equity securities, Gross Unrealized Gain Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax Equity securities, Gross Unrealized Loss Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax Equity securities, Estimated Fair Value Securities, Cost or Amortized Cost Available-for-sale Securities, Amortized Cost Basis Securities, Gross Unrealized Gain Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Securities, Gross Unrealized Loss Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Securities, Estimated Fair Value Available-for-sale Securities Statutory Financial Data, Risk-Based Capital and Dividend Restrictions Insurance Disclosure [Text Block] Number of types of business Number Of Business Classes Number Of Business Classes Number of states in which entity operates Number of States in which Entity Operates New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Unrecognized tax benefits Unrecognized Tax Benefits Income tax penalties and interest accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Cumulative effect of adoption of ASU Cumulative Effect of New Accounting Principle in Period of Adoption, Gross Cumulative Effect of New Accounting Principle in Period of Adoption, Gross Deferred income taxes Reclassification of previously recognized deferred taxes from accumulated other comprehensive income into accumulated deficit Tax Cuts And Jobs Act, Reclassification From AOCI To Retained Earnings, Tax Effect Tax Cuts And Jobs Act, Reclassification From AOCI To Retained Earnings, Tax Effect Lease liability Operating Lease, Liability Right of use asset Operating Lease, Right-of-Use Asset Operating lease rent expense Operating Leases, Rent Expense Summary of the Effects of Reinsurance Effects of Reinsurance [Table Text Block] Summary of Statutory Basis Information Statutory Accounting Practices Disclosure [Table Text Block] Liability for Claims and Claims Adjustment Expense [Table] Liability for Claims and Claims Adjustment Expense [Table] Commercial Line Personal Line Florida Homeowners Florida Homeowners [Member] Florida Homeowners [Member] Texas Homeowners Texas Homeowners [Member] Texas Homeowners [Member] Commercial Automobile Line Commercial Automobile Line [Member] Product line consisting of insurance policies issued for commercial automobile. Personal Automobile Line Personal Automobile Line [Member] Product line consisting of insurance policies issued for personal automobile lines. Wind-exposed Homeowners Wind-exposed Homeowners [Member] Wind-exposed homeowners (previously known as Specialty homeowners) — provides coverage in niche homeowners markets that have special risk characteristics, including coastal exposure to wind. Catastrophe Reinsurance Treaty Catastrophe Reinsurance Treaty [Member] Catastrophe Reinsurance Treaty [Member] Liability for Claims and Claims Adjustment Expense [Line Items] Liability for Claims and Claims Adjustment Expense [Line Items] Prior year adjustments Amount ceded Ceded losses recognized as a benefit Deferred ceded losses Ceded premiums Ceded Premiums Payable Catastrophe losses incurred (percentage) Loss From Catastrophes, Percent Loss From Catastrophes, Percent Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] Balance at beginning of period Deferred policy acquisition costs Deferred Policy Acquisition Costs, Additions Amortization of policy acquisition costs Net change Deferred Policy Acquisition Costs, Period Increase (Decrease) Balance at end of period Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Private Placement Private Placement [Member] Stock Repurchase Program, February 2016 Stock Repurchase Program, February 2016 [Member] Stock Repurchase Program, February 2016 [Member] Class of Stock [Line Items] Class of Stock [Line Items] Number of share authorized for repurchase (in shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Common equity issued Proceeds from Issuance of Private Placement Common equity issued (in shares) Sale of Stock, Number of Shares Issued in Transaction Price per share (in dollars per share) Shares Issued, Price Per Share Authorized amount of stock repurchase program Stock Repurchase Program, Authorized Amount Stock repurchased and retired during period, shares (in shares) Stock repurchased and retired during period, value Common stock voting rights, number of votes per share Common Stock, Voting Rights, Per Share Common Stock, Voting Rights, Per Share Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block]