Debt Disclosure [Abstract] Future Principal Payments [Abstract] Long-term Debt, Fiscal Year Maturity [Abstract] 2017 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2018 Long-term Debt, Maturities, Repayments of Principal in Year Two 2019 Long-term Debt, Maturities, Repayments of Principal in Year Three Total Long-term Debt, Gross Statement of Financial Position [Abstract] Assets Assets [Abstract] Fixed maturities, available-for-sale, at fair value (amortized cost of $669,363 and $630,688 as of June 30, 2017 and December 31, 2016, respectively) Available-for-sale Securities, Debt Securities Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Premiums receivable Premiums Receivable, Net Accrued investment income Accrued Investment Income Receivable Prepaid expenses Prepaid Expense Deferred policy acquisition costs, net Deferred Policy Acquisition Costs Software and equipment, net Property, Plant and Equipment, Net Intangible assets and goodwill Intangible Assets, Net (Including Goodwill) Prepaid reinsurance premiums Prepaid Reinsurance Premiums Deferred tax asset, net Deferred Income Tax Assets, Net Other assets Other Assets Total assets Assets Liabilities Liabilities [Abstract] Term loan Long-term Debt Unearned premiums Unearned Premiums Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Reserve for insurance claims and claim expenses Liability for Claims and Claims Adjustment Expense Reinsurance funds withheld Funds Held under Reinsurance Agreements, Liability Deferred ceding commission Deferred Revenue Warrant liability, at fair value Warrant Liability Warrant Liability Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Common stock - class A shares, $0.01 par value; 59,858,418 and 59,145,161 shares issued and outstanding as of June 30, 2017 and December 31, 2016, respectively (250,000,000 shares authorized) Common Stock, Value, Outstanding Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive loss, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Total shareholders' equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders' equity Liabilities and Equity Investments, Debt and Equity Securities [Abstract] Schedule of Fair Values and Gross Unrealized Gains and Losses Available-for-sale Securities [Table Text Block] Schedule of Investments by Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Aging Unrealized Losses Schedule of Unrealized Loss on Investments [Table Text Block] Net Investment Income Investment Income [Table Text Block] Net Realized Investments Gains (Losses) Realized Gain (Loss) on Investments [Table Text Block] Term Loan Debt Disclosure [Text Block] Reinsurance Disclosures [Abstract] Effects of Reinsurance Effects of Reinsurance [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Accumulated Deficit Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Beginning balance (in shares) Shares, Outstanding Cumulative effect of change in accounting principle Cumulative Effect of New Accounting Principle in Period of Adoption Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes Stock Issued During Period, Value, Employee Stock Purchase Plan, Net of Tax Withholdings Stock Issued During Period, Value, Employee Stock Purchase Plan, Net of Tax Withholdings Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans, Net of Shares For Tax Withholdings Stock Issued During Period, Shares, Employee Stock Purchase Plans, Net of Shares For Tax Withholdings Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Change in unrealized investment gains/losses, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net income Net Income (Loss) Attributable to Parent Ending balance Ending balance (in shares) Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] U.S. Treasury securities and obligations of U.S. government agencies US Treasury and Government [Member] Municipal debt securities US States and Political Subdivisions Debt Securities [Member] Corporate debt securities Corporate Debt Securities [Member] Asset-backed securities Asset-backed Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Number of securities, less than 12 months Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year Fair value, less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Unrealized losses, less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Number of securities,12 months or greater Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year Fair value, 12 months or greater Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Unrealized losses, 12 months or greater Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Number of securities, total Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Cash and investments held with various state insurance departments Cash, Cash Equivalents, and Short-term Investments Unrealized loss position, accumulated loss Unrealized loss position, 12 months or greater Insurance [Abstract] Reconciliation of Liability for Insurance Claims and Claims Expenses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) 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] Net realized investment losses Available-for-sale Securities, Gross Realized Gain (Loss) Loss (gain) from change in fair value of warrant liability Fair Value Adjustment of Warrants Depreciation and amortization Depreciation, Amortization and Accretion, Net Net amortization of premium on investment securities Accretion (Amortization) of Discounts and Premiums, Investments Amortization of debt discount and debt issuance costs Amortization of Debt Issuance Costs and Discounts Share-based compensation expense Share-based Compensation Deferred income taxes Deferred Income Tax Expense (Benefit) Changes in operating assets and liabilities: Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Accrued investment income Increase (Decrease) in Accrued Investment Income Receivable Premiums receivable Increase (Decrease) in Premiums Receivable Prepaid expenses Increase (Decrease) in Prepaid Expense Deferred policy acquisition costs, net Increase (Decrease) in Deferred Policy Acquisition Costs Other assets Increase (Decrease) in Prepaid Expense and Other Assets Unearned premiums Increase (Decrease) in Unearned Premiums Reserve for insurance claims and claims expenses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Reinsurance balances, net Increase (Decrease) in Reinsurance Assets and Liabilities Increase (Decrease) in Reinsurance Assets and Liabilities Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchase of short-term investments Payments to Acquire Short-term Investments Purchase of fixed-maturity investments, available-for-sale Payments to Acquire Available-for-sale Securities, Debt Proceeds from maturity of short-term investments Proceeds from Sale of Short-term Investments Proceeds from redemptions, maturities and sale of fixed-maturity investments, available-for-sale Proceeds from Sale and Maturity of Available-for-sale Securities Additions to software and equipment Payments to Acquire Property, Plant, and Equipment Net cash used in by investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of common stock related to employee equity plans Proceeds from Issuance of Common Stock Taxes paid related to net share settlement of equity awards Payments Related to Tax Withholding for Share-based Compensation Repayments of term loan Repayments of Long-term Debt Payments of debt modification costs Payments of Debt Issuance Costs Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid Income taxes paid Income Taxes Paid Ceded Credit Risk [Table] Ceded Credit Risk [Table] Ceded Credit Risk, Reinsurer [Axis] Ceded Credit Risk, Reinsurer [Axis] Ceded Credit Risk, Reinsurer [Domain] Ceded Credit Risk, Reinsurer [Domain] Third-Party Reinsurers Third-Party Reinsurers [Member] Third-Party Reinsurers [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Mortgage-linked Debt Secured Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 2017 ILN Notes Two Thousand Seventeen ILN Notes [Member] Two Thousand Seventeen ILN Notes [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Oaktown Re Ltd Oaktown Re Ltd [Member] Oaktown Re Ltd [Member] Reinsurance Policy, Type [Axis] Reinsurance Policy, Type [Axis] Reinsurance Policy [Domain] Reinsurance Policy [Domain] 2017 ILN Transaction Two Thousand Seventeen ILN Transaction [Member] Two Thousand Seventeen ILN Transaction [Member] Existing Risk Written Policies Eligible Policies, Pool One [Member] Eligible Policies, Pool One [Member] Fannie Mae Eligible Policies, Pool Two [Member] Eligible Policies, Pool Two [Member] Risk Written Policies from September 1, 2016 through December 31, 2017 Eligible Policies, Pool Three [Member] Eligible Policies, Pool Three [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum Maximum [Member] Ceded Credit Risk [Line Items] Ceded Credit Risk [Line Items] Number of third-party reinsurance transactions, Number Third-Party Reinsurance Transactions, Number Third-Party Reinsurance Transactions, Number Aggregate excess of loss reinsurance coverage Reinsurance Retention Policy, Excess Retention, Amount Reinsured Aggregate excess of loss reinsurance retained by company Reinsurance Retention Policy, Amount Retained Proceeds from issuance of notes Proceeds from Issuance of Debt Risk premiums paid Reinsurance Retention, Risk Premiums Paid Reinsurance Retention, Risk Premiums Paid Percent of policies ceded under 2016 QSR Transaction Reinsurance Retention Policy, Reinsured Risk, Percentage Ceding commissions under 2016 QSR Transaction Ceded Credit Risk, Commission Earned, Percentage Ceded Credit Risk, Commission Earned, Percentage Threshold for loss ratio on loans under 2016 QSR Transaction to qualify for profit commission Ceded Credit Risk, Profit Commission, Loss Ratio On Loans Threshold Ceded Credit Risk, Profit Commission, Loss Ratio On Loans Threshold Reinsurance recoverable on unpaid claims Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Anticipated payment related annual operating expenses Anticipated Operating Expense Payments, Annual Amount of anticipated payments related to operating expenses of counterparty. Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Warrant Liability Warrant Liability [Member] Warrant Liability [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [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] Share price (in dollars per share) Share Price Risk free rate Fair Value Assumptions, Risk Free Interest Rate Expected term Fair Value Assumptions, Expected Term Volatility assumption Fair Value Assumptions, Expected Volatility Rate Expected dividend rate Fair Value Assumptions, Expected Dividend Rate Bonds Bonds [Member] Short-term investments Short-term Investments [Member] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized (Losses) Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Available-for-sale Securities Income Statement [Abstract] Net unrealized investment gains in AOCI, tax amount Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Reclassification adjustment for losses (gains) included in net income, tax amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Warrants issued (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Right to purchase, number of shares per warrant Number Of Shares, Right To Purchase Per Warrant Number Of Shares, Right To Purchase Per Warrant Exercise price of warrants (in dollars per warrant) Class of Warrant or Right, Exercise Price of Warrants or Rights Warrants value Warrants and Rights Outstanding Number of warrants exercised during period Class of Warrant or Right, Number of Warrants Exercised During Period Class of Warrant or Right, Number of Warrants Exercised During Period Net premiums written Premiums Written, Net [Abstract] Direct Direct Premiums Written Ceded Ceded Premiums Written Net premiums written Premiums Written, Net Net premiums earned Premiums Earned, Net [Abstract] Direct Direct Premiums Earned Ceded Ceded Premiums Earned Net premiums earned Premiums Earned, Net Income Tax Disclosure [Abstract] Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective income tax rate on pre-tax income or loss Effective Income Tax Rate Reconciliation, Percent Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Earnings Per Share [Abstract] Basic earnings (loss) per share (in dollars per share) Earnings Per Share, Basic Basic weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Dilutive effect of non-vested shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Dilutive weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted earnings (loss) per share (in dollars per share) Earnings Per Share, Diluted Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] [Domain] for Sale of Stock [Axis] IPO IPO [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] MAC Financial Holding Corporation and Subsidiaries MAC Financial Holding Corporation and Subsidiaries [Member] MAC Financial Holding Corporation and Subsidiaries [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock - Class A Common Class A [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Stock issued during period, shares, net issues (in shares) Stock Issued During Period, Shares, New Issues Proceeds from issuance of common stock, net of stock issuance costs Proceeds From Issuance of Common Stock, Net of Stock Issuance Costs Proceeds From Issuance of Common Stock, Net of Stock Issuance Costs Consideration transferred, cash and equity interests issued and issuable Business Combination, Consideration Transferred, Cash and Equity Interests Issued and Issuable Business Combination, Consideration Transferred, Cash and Equity Interests Issued and Issuable Consideration transferred, liabilities incurred Business Combination, Consideration Transferred, Liabilities Incurred Number of states in which the entity operates Number of States in which Entity Operates Deferred policy acquisition cost, amortization expense Deferred Policy Acquisition Cost, Amortization Expense Premium deficiency reserve Premium Deficiency Reserve, Expense Premium Deficiency Reserve, Expense Schedule of Statutory Net Loss, Surplus, Contingency Reserve and Risk-to-Capital Ratio Statutory Accounting Practices Disclosure [Table Text Block] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Beginning balance Less reinsurance recoverables Beginning balance, net of reinsurance recoverables Liability for Unpaid Claims and Claims Adjustment Expense, Net Claims incurred: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Current year Current Year Claims and Claims Adjustment Expense Prior years Prior Year Claims and Claims Adjustment Expense Total claims and claims expenses incurred Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Claims and claim expenses paid: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Total claims and claim expenses paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Ending balance, net of reinsurance recoverables Add reinsurance recoverables Reserve at end of period, net of reinsurance recoverables Organization and Basis of Presentation Business Description and Basis of Presentation [Text Block] Warrants Line of Credit and Related Warrants [Text Block] Line of Credit and Related Warrants [Text Block] Amortized Cost Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due after one through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Due after five through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Asset-backed securities Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Fair Value Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due after one through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due after five through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Asset-backed securities Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Fair Value Liability for Claims and Claims Adjustment Expense [Table] Liability for Claims and Claims Adjustment Expense [Table] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Fannie Mae Fannie Mae [Member] Fannie Mae [Member] Liability for Claims and Claims Adjustment Expense [Line Items] Liability for Claims and Claims Adjustment Expense [Line Items] IBNR, default period (at least) Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Default Period Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Default Period Total gross liability for unpaid claims and claim adjustment expenses Primary loans in default Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Number of Primary Loans in Default Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Number of Primary Loans in Default Number of claims paid Liability for Paid Claims and Claims Adjustment Expense, Number of Paid Claims Liability for Paid Claims and Claims Adjustment Expense, Number of Paid Claims Claims paid, including amounts covered by insurance Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Including Amounts Covered By Insurance Amount of payments to settle insured claims and pay costs incurred in the claims settlement process, including amount covered by insurance. Number of loans in pool past due 60 days or more Loans In Pool, Past Due 60 Days Or More, Number Of Loans Loans In Pool, Past Due 60 Days Or More, Number Of Loans Risk-in-Force of loans in pool past due 60 days or more Loans In Pool, Past Due 60 Days Or More, Loan Risk in Force Loans In Pool, Past Due 60 Days Or More, Risk in Force Deductible on policy Mortgage Pool Insurance, Claim Deductible Mortgage Pool Insurance, Claim Deductible Loan-to-value ratio (less than) Loans In Pool, Loan To Value Ratio Loans In Pool, Loan To Value Ratio Claims applied to pool deductible Liability for Unpaid Claims and Claims Adjustment Expense, Claims Applied to Deductible Liability for Unpaid Claims and Claims Adjustment Expense, Claims Applied to Deductible Favorable prior year development Reserve for prior year insurance claims and claim expenses Liability for Prior Year Claims and Claims Adjustment Expense Liability for Prior Year Claims and Claims Adjustment Expense Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Senior Secured Debt Senior Secured Debt [Member] Senior Secured Debt [Member] Credit Agreement Credit Agreement [Member] Credit Agreement [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Eurodollar Eurodollar [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument term Debt Instrument, Term Debt instrument, face amount Debt Instrument, Face Amount Debt instrument, extension of term Debt Instrument, Term, Period Of Extension Period of time related to extension of maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Variable rate floor Debt Instrument, Variable Interest Rate Floor Debt Instrument, Variable Interest Rate Floor Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Interest rate during period Debt Instrument, Interest Rate During Period Periodic payment of principal Debt Instrument, Periodic Payment, Principal Term loan Debt issuance cost Percentage of debt discount Debt Discount (Premium), Percentage Debt Discount (Premium), Percentage Interest expense Interest Expense, Debt Debt instrument covenant, maximum debt-to-total capitalization ratio Debt Instrument, Covenant, Debt to Total Capitalization Ratio, Maximum Debt Instrument, Covenant, Debt to Total Capitalization Ratio, Maximum Debt instrument covenant, maximum risk-to-capital ratio Debt Instrument, Covenant, Risk to Capital Ratio, Maximum Debt Instrument, Covenant, Risk to Capital Ratio, Maximum Debt instrument covenant, minimum liquidity requirement Debt Instrument, Covenant, Liquidity Requirement, Minimum Debt Instrument, Covenant, Liquidity Requirement, Minimum Reinsurance Reinsurance [Text Block] Gross realized investment gains Available-for-sale Securities, Gross Realized Gains Gross realized investment losses Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments Net realized investment gains (losses) Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Fixed maturities, amortized cost Available-for-sale Debt Securities, Amortized Cost Basis Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Common stock, shares authorized (in shares) Common Stock, Shares Authorized Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Revenues Revenues [Abstract] Net premiums earned Net investment income Net Investment Income Net realized investment gains (losses) Other revenues Other Revenue, Net Total revenues Revenues Expenses Costs and Expenses [Abstract] Insurance claims and claims expenses Policyholder Benefits and Claims Incurred, Net, Property, Casualty and Liability Underwriting and operating expenses Other Cost and Expense, Operating Total expenses Costs and Expenses Other (expense) income Other Income and Expenses [Abstract] Gain (loss) from change in fair value of warrant liability Gain (Loss) on Change in Fair Value of Warrant Liability Gain (Loss) on Change in Fair Value of Warrant Liability Interest expense Total other expense Other Nonoperating Income (Expense) Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income (loss) Earnings (loss) per share Earnings Per Share, Basic and Diluted [Abstract] Weighted average common shares outstanding Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Dilutive weighted average shares outstanding (in shares) Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Net unrealized gains in accumulated other comprehensive income, net of tax expense of $1,388 and $0 for the three months ended June 30, 2017 and 2016, respectively, and $2,073 and $0 for the six months ended June 30,2017 and 2016 Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification adjustment for losses (gains) included in net income, net of tax expense of $66 and $0 for the three months ended June 30, 2017 and 2016, respectively, and $45 and $0 for the six months ended June 30,2017 and 2016 Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Prior Period Adjustments Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] Combined NMic and Re one Combined [Member] NMic and Re one Combined [Member] Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Statutory net income (loss) Statutory Accounting Practices, Statutory Net Income Amount Statutory surplus Statutory Accounting Practices, Statutory Capital and Surplus, Balance Contingency reserve Statutory Accounting Practices, Contingency Reserve Contingency reserve recorded under Statutory Accounting Principles is a liability to protect against loss during periods of extreme contraction. Risk-to-Capital Risk To Capital Ratio Regulatory Actual This concept represents an entity's ratio of net risk in force (excludes risk ceded through reinsurance contracts and risk in force on defaulted loans) to the amount of statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves). Reserves for Insurance Claims and Claims Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Schedule of Future Principal Payments Schedule of Maturities of Long-term Debt [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs, Policy [Policy Text Block] Premium Deficiency Reserves Premium Deficiency Reserves Policy [Policy Text Block] Premium Deficiency Reserves Policy [Policy Text Block] Reinsurance Reinsurance Accounting Policy [Policy Text Block] Variable Interest Entity Consolidation, Variable Interest Entity, Policy [Policy Text Block] Premiums Receivable Premiums Receivable, Basis of Accounting, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Investment Income, Net [Abstract] Investment Income, Net [Abstract] Investment income Investment Income, Interest and Dividend Investment expenses Investment Income, Investment Expense Net investment income Investment Income, Net Income Taxes Income Tax Disclosure [Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Change in fair value of warrant liability included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Ending balance Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Share-based Compensation Arrangement Stock Compensation Plan [Member] Share-based Compensation Arrangement and Warrants Stock Compensation Plan and Warrant [Member] Stock Compensation Plan and Warrant [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from EPS calculation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Roll-Forward of Level 3 Liabilities Measured at Fair Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] 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] Municipal debt securities Available-for-sale securities Cash, cash equivalents and short-term investments Cash and Cash Equivalents, Fair Value Disclosure Total assets Assets, Fair Value Disclosure Warrant liability Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Ceded risk-in-force Risk In Force, Ceded Risk In Force, Ceded Ceded premiums written Ceded premiums earned Ceded claims and claims expenses Reinsurance Ceded Claims and Claims Expenses Reinsurance Ceded Claims and Claims Expenses Ceding commission written Reinsurance Ceding Commission Written Reinsurance Ceding Commission Written Ceding commission earned Reinsurance Ceding Commission Earned Reinsurance Ceding Commission Earned Profit commission Reinsurance Profit Commission Reinsurance Profit Commission Earnings (Loss) per Share Earnings Per Share [Text Block] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU No. 2016-09 Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Cumulative effect adjustment Statutory Information Insurance Disclosure [Text Block] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Previously Reported Scenario, Previously Reported [Member] Restatement Adjustment Restatement Adjustment [Member] Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Income tax (benefit) Basic EPS (in dollars per share) Diluted EPS (in dollars per share) Deferred tax asset, net Total assets Total shareholder's equity Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Change in unrealized investment gains/losses, tax Other Comprehensive Income (Loss), Available-for-sale Securities, Tax