Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Investments, Debt and Equity Securities [Abstract] 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 [Member] US Treasury and Government [Member] Municipal debt securities [Member] US States and Political Subdivisions Debt Securities [Member] Corporate debt securities [Member] Corporate Debt Securities [Member] Asset-backed securities [Member] 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, Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Unrealized Losses, Total Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 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 Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accumulated Other Comprehensive Loss [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Deficit [Member] Retained Earnings [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Common Class A [Member] Common Class B [Member] Common Class B [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Stockholders' Equity Attributable to Parent Issuance of shares of common stock, net of expenses of $3,483 in 2013 Stock Issued During Period, Value, New Issues Issuance of common stock related to acquisition of subsidiaries Stock Issued During Period, Value, Acquisitions Common stock: class A shares issued under stock plans, net of shares withheld (for) from employee taxes Stock Issued During Period, Value, Employee Stock Purchase Plan Conversion of class B shares of common stock into Class A shares of common stock Stock Issued During Period, Value, Conversion of Convertible Securities Common stock: class A shares issued related to warrants Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants 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 of $0, $0 and $2,390 Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net loss Net Income (Loss) Attributable to Parent Ending Balance Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Parent [Member] Parent Company [Member] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Share-based compensation expense Share-based Compensation Warrants issued in connection with line of credit Proceeds from Issuance of Warrants (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 Gain from settlement of warrants Gain (Loss) From Settlement of Warrants Gain (Loss) From Settlement of Warrants Net realized investment gains Available-for-sale Securities, Gross Realized Gain (Loss) Depreciation and other amortization Depreciation, Amortization and Accretion, Net Noncash intraperiod tax allocation Expense (Benefit) for Taxes on Current Year Unrealized Gains Expense (Benefit) for Taxes on Current Year Unrealized Gains Changes in operating assets and liabilities: Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Equity in net loss of subsidiaries Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee Accrued investment income Increase (Decrease) in Accrued Investment Income Receivable Receivable from affiliates Increase (Decrease) Due from Affiliates Prepaid expenses Increase (Decrease) in Prepaid Expense Other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash used in 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] Capitalization of subsidiaries Payments to Acquire Interest in Subsidiaries and Affiliates Purchase of fixed-maturity investments, available-for-sale Payments to Acquire Available-for-sale Securities, Debt Proceeds from redemptions, maturities and sale of fixed-maturity investments, available-for-sale Proceeds from Sale of Available-for-sale Securities, Debt Purchase of software and equipment Payments to Acquire Property, Plant, and Equipment Acquisition of subsidiaries Payments to Acquire Businesses, Net of Cash Acquired 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 [Abstract] Payments on line of credit Proceeds from (Repayments of) Lines of Credit Issuance of common stock 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 Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Insurance [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Reserve at beginning of period Liability for Claims and Claims Adjustment Expense Claims and claim expenses 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 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 paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Reserve at end of period Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] 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] The 2012 Stock Incentive Plan [Member] The 2012 Stock Incentive Plan [Member] The 2012 Stock Incentive Plan [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Units [Member] 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] Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected stock price volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Projected forfeiture rate Share Based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate Share Based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate Income Tax Disclosure [Abstract] Current Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit) Total income tax benefit Income Tax Expense (Benefit) Statement of Financial Position [Abstract] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Common stock, shares authorized Common Stock, Shares Authorized Schedule of Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Grant Date Fair Values of Stock Options, Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Grant Date Fair Value of Restricted Stock Units, Valuation Assumptions Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Property, Plant and Equipment [Abstract] Software and Equipment Property, Plant and Equipment Disclosure [Text Block] Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract] Financial Information of Registrant Reinsurance Parent Company Only Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block] Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Net premiums written Premiums Written, Net Net premiums earned Premiums Earned, Net Net investment income Net Investment Income Net realized investment gains (losses) Gain (loss) from change in fair value of warrant liability Gain from settlement of warrants Insurance claims and claims expenses Policyholder Benefits and Claims Incurred, Net, Property, Casualty and Liability Amortization of deferred policy acquisition costs Deferred Policy Acquisition Cost, Amortization Expense Underwriting and operating expenses Other Expenses Loss per share Earnings Per Share [Abstract] Basic and diluted loss per share (in dollars per share) Earnings Per Share, Basic and Diluted Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Loss on impairment Effective Income Tax Rate Reconciliation, Loss on Impairment Effective Income Tax Rate Reconciliation, Loss on Impairment Prior year adjustment Effective Income Tax Rate Reconciliation, Prior Year Adjustment Effective Income Tax Rate Reconciliation, Prior Year Adjustment Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Purchase accounting adjustment Effective Income Tax Rate Reconciliation, Purchase accounting Adjustment Effective Income Tax Rate Reconciliation, Purchase accounting Adjustment Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Accounting Policies [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic Concentration Risk [Member] Geographic Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Sales Revenue, Net [Member] Sales Revenue, Net [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Software [Member] Software and Software Development Costs [Member] Equipment [Member] Equipment [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Number of customers Number of Insured Number of Insured Concentration risk Concentration Risk, Percentage Estimated useful life Property, Plant and Equipment, Useful Life Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Domestic Tax Authority [Member] Domestic Tax Authority [Member] State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Expiration Period [Axis] Expiration Period [Axis] Expiration Period [Axis] Expiration Period [Domain] Expiration Period [Domain] [Domain] for Expiration Period [Axis] Annual Limitation Through Year Two [Member] Annual Limitation Through Year Two [Member] Annual Limitation Through Year Two [Member] Annual Limitations After Year Two [Member] Annual Limitations After Year Two [Member] Annual Limitations After Year Two [Member] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Income tax benefit Effective income tax rate Income tax expense (benefit) Deferred tax liabilities, gross Deferred Tax Assets, Net Taxes paid related to net share settlement of equity awards Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Operating loss carryforwards Operating Loss Carryforwards Loss carry forwards subject to expiration Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Valuation allowance Deferred Tax Assets, Valuation Allowance 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 Less than, LTV ratio Loans In Pool, Loan To Value Ratio Loans In Pool, Loan To Value Ratio Equity [Abstract] Common Stock Offerings Stockholders' Equity Note Disclosure [Text Block] Revenue Recognition Insurance Premiums Revenue Recognition, Policy [Policy Text Block] Reserve for Insurance Claims and Claims Expenses Liability Reserve Estimate, Policy [Policy Text Block] Investments Marketable Securities, Available-for-sale Securities, 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] Income Taxes Income Tax, Policy [Policy Text Block] Warrants Warrants Policy [Policy Text Block] Warrants Policy [Policy Text Block] Share-based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Software and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Business Combinations, Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Premiums receivable Premiums Receivable, Basis of Accounting, Policy [Policy Text Block] Recent Accounting Standards Updates Adopted New Accounting Pronouncements, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Subsequent Events Subsequent Events, Policy [Policy Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Depreciation and amortization Depreciation, Depletion and Amortization Software acquired, written off Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment, Write Off Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment, Write Off Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets and Goodwill Intangible Assets Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), tax Other Comprehensive Income (Loss), Tax 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] Schedule of Net Investment Income Investment Income [Table Text Block] Statement of Cash Flows [Abstract] Net realized investment gains Loss on impairment Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Premiums receivable Increase (Decrease) in Premiums Receivable Deferred policy acquisition costs, net Increase (Decrease) in Deferred Policy Acquisition Costs Unearned premiums (Increase) Decrease in Unearned Premiums, Net Reserve for insurance claims and claims expenses Increase (Decrease) in Loss and Loss Adjustment Expense Reserve Purchase of short-term investments Payments to Acquire Short-term Investments Proceeds from maturity of short-term investments Proceeds from Sale of Short-term Investments Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Restricted cash Increase (Decrease) in Restricted Cash Noncash financing activities Noncash Investing and Financing Items [Abstract] Conversion of class B shares of common stock into class A shares of common stock Conversion of Stock, Amount Issued Acquisition of subsidiaries Other Noncash Investing and Financing Items [Abstract] Warrants issued in connection with acquisition of subsidiaries Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Warrants Issued Common stock issued in connection with acquisition of subsidiaries Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued Income Taxes Income Tax Disclosure [Text Block] 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 Schedule of Risk to Capital Statutory Accounting Practices Disclosure [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies [Table] Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies [Table] Jurisdiction [Axis] Jurisdiction [Axis] Statutory Accounting Practices, Jurisdiction [Domain] Statutory Accounting Practices, Jurisdiction [Domain] Fannie Mae and Freddie Mac [Member] Fannie Mae and Freddie Mac [Member] Fannie Mae and Freddie Mac [Member] Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items] Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items] Capital required to be capitalized Statutory Accounting Practices, Initial Statutory Capital and Surplus Required Statutory Accounting Practices, Initial Statutory Capital and Surplus Required Maximum risk to capital ratio Risk To Capital Ratio Regulatory Maximum Risk To Capital Ratio Regulatory Maximum Minimum capitalization requirement period Minimum Capitalization Requirement Period Minimum Capitalization Requirement Period Office facility lease, term of contract Lessee Leasing Arrangements, Operating Leases, Term of Contract Additional square feet of furnished office space under amended lease terms Additional Square Feet of Furnished Office Space under Amended Lease Terms Additional Square Feet of Furnished Office Space under Amended Lease Terms Rent expense Operating Leases, Rent Expense, Net Gross unrealized losses Unrealized losses for a period of 12 months or greater Gross realized gains Available-for-sale Securities, Gross Realized Gains Gross realized losses Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments Cash and investments held with various state insurance departments Cash, Cash Equivalents, and Short-term Investments Assets Assets [Abstract] Fixed maturities, available-for-sale, at fair value (amortized cost of $337,718 and $416,135 as of December 31, 2014 and December 31, 2013, respectively) Available-for-sale Securities, Debt Securities Cash and cash equivalents 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) Other assets Other Assets Total assets Assets Liabilities Liabilities [Abstract] Unearned premiums Unearned Premiums Reserve for insurance claims and claim expenses Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Warrant liability, at fair value Warrant Liability Warrant Liability Deferred tax liability Deferred Tax Liabilities, Net 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; 58,428,548 and 58,052,480 shares issued and outstanding as of December 31, 2014 and December 31, 2013, 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 Total liabilities and shareholders' equity Liabilities and Equity Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Fixed maturities, available-for-sale, at fair value Investments Investment in subsidiaries, at equity in net assets Equity Method Investments Due from affiliates, net Due from Affiliates Equity [Abstract] Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] State licenses [Member] State Licenses [Member] State Licenses [Member] GSE Approvals [Member] GSE Approvals [Member] GSE Approvals [Member] Indefinite-lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Goodwill Goodwill Intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Leasehold Improvements [Member] Leasehold Improvements [Member] Property plant and equipment Property, Plant and Equipment, Gross Accumulated amortization and depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Software and equipment, net Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] NMIC [Member] NMIC [Member] NMIC [Member] NMI Re One [Member] NMI Re One [Member] NMI Re One [Member] NMic and Re one Combined [Member] NMic and Re one Combined [Member] NMic and Re one Combined [Member] Statutory Accounting Practices [Line Items] Statutory Accounting Practices [Line Items] Primary risk-in-force Primary Risk in Force [Abstract] Primary Risk in Force [Abstract] Direct Primary Risk in Force, Gross Primary Risk in Force, Gross Assumed Primary Risk in Force, Assumed Primary Risk in Force, Assumed Ceded Primary Risk in Force, Ceded Primary Risk in Force, Ceded Total primary risk-in-force Risk in Force Primary This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time) for insurance written on a primary basis. Primary insurance may be written on a flow basis, in which loans are insured in individual, loan-by-loan transactions, or may be written on a bulk basis, in which each loan in a portfolio of loans is individually insured in a single, bulk transaction. Pool risk-in-force Mortgage Insurance, Risk in Force, Pool [Abstract] Mortgage Insurance, Risk in Force, Pool [Abstract] Direct Mortgage Insurance in Force, Gross, Pool Mortgage Insurance in Force, Gross, Pool Assumed Mortgage Insurance in Force, Assumed, Pool Mortgage Insurance in Force, Assumed, Pool Ceded Mortgage Insurance in Force, Ceded, Pool Mortgage Insurance in Force, Ceded, Pool Total pool risk-in-force Mortgage Insurance Risk In Force, Pool This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time) for insurance written on a pool basis. In a pool policy, where a group of loans (or pool) are insured under a single contract. Pool insurance may have a stated aggregate loss limit for a pool of loans and may also have a deductible under which no losses are paid by the insurer until losses on the pool of loans exceed the deductible. Total risk-in-force Mortgage Insurance Risk in Force This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time). Total statutory policyholders' position Statutory Accounting Practices, Statutory Capital and Surplus, Balance Statutory contingency reserve Contingency Reserve Funds separated from retained earnings and held to cover any unforeseen future business losses. Total statutory policyholders' position Statutory Accounting Practices Statutory Policyholders Surplus Plus Contingency Reserves Statutory Accounting Practices Statutory Policyholders Surplus Plus Contingency Reserves 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). Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Stock Options [Member] Employee Stock Option [Member] Reserves for Insurance Claims and Claims Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Subject to Market and Service Conditions [Member] Subject to Market and Service Conditions [Member] Subject to Market and Service Conditions [Member] Subject to Service Conditions [Member] Subject to Service Conditions [Member] Subject to Service Conditions [Member] NMIH 2014 Omnibus Incentive Plan [Member] NMIH 2014 Omnibus Incentive Plan [Member] NMIH 2014 Omnibus Incentive Plan [Member] Number of shares authorized to be reserved for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Number of exercises Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of options vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted average exercise price for options vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Weighted average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Options vested aggregate value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Weighted average remaining contractual life of options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Total unrecognized compensation cost related to non-vested stock options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Compensation related to non-vested awards, weighted-average period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Modification to vesting terms, number of restricted stock units affected (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Shares Outstanding and Unvested Affected Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Shares Outstanding and Unvested Affected Restricted stock units outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Vesting percentage subject to both market and service conditions, annual vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Subject to Both Market and Service Conditions, Annual Vesting Percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Subject to Both Market and Service Conditions, Annual Vesting Percentage Number of simulations Number of Simulations Number of Simulations Weighted average remaining contractual life of RSUs outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Dividends Dividends Total unrecognized compensation cost related to non-vested restricted stock units Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employer matching contribution, percent of match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer matching contribution, percent of employees' gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Contribution amount Defined Contribution Plan, Employer Discretionary Contribution Amount Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Restricted Stock beginning balance (in shares) Restricted stock units granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Less: Restricted stock units vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Less: Restricted stock units forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Restricted Stock beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Restricted Stock beginning balance (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 Restricted Stock 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 Less: Restricted Stock 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 Less: Restricted Stock 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 Restricted Stock ending balance (in dollars per share) Summary of Investments, Other than Investments in Related Parties [Abstract] Summary of Investments - Other than Investments in Related Parties Summary of Investments, Other than Investments in Related Parties [Text Block] Deferred Tax Asset, Gross [Abstract] Deferred Tax Asset, Gross [Abstract] Deferred Tax Asset, Gross [Abstract] Capitalized start-up costs Deferred Tax assets, Capitalized Start-up Costs, Gross Deferred Tax assets, Capitalized Start-up Costs, Gross Share-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Gross Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Gross Unrealized loss on investments Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross, Tax Effected Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross, Tax Effected Net operating loss carry forwards Deferred Tax Assets, Operating Loss Carryforwards, Gross Deferred Tax Assets, Operating Loss Carryforwards, Gross Unearned premium reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve, Gross Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve, Gross Other Deferred Tax Assets, Other, Gross Deferred Tax Assets, Other, Gross Total gross deferred tax assets Deferred Tax Assets, Gross, Before Tax Effected Deferred Tax Assets, Gross, Before Tax Effected Less: valuation allowance Deferred Tax Assets, Valuation Allowance, Before Tax Effected Deferred Tax Assets, Valuation Allowance, Before Tax Effected Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Before Tax Effected Deferred Tax Assets, Net of Valuation Allowance, Before Tax Effected Deferred tax asset Deferred Tax Assets, Gross [Abstract] Capitalized start-up costs Deferred Tax assets, Capitalized Start-up Costs Deferred Tax assets, Capitalized Start-up Costs Share-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Unrealized loss on investments Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross Net operating loss carry forwards Deferred Tax Assets, Operating Loss Carryforwards Unearned premium reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve Other Deferred Tax Assets, Other Total gross deferred tax assets Deferred Tax Assets, Gross Less: valuation allowance Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Liability, Gross [Abstract] Deferred Tax Liability, Gross [Abstract] Deferred Tax Liability, Gross [Abstract] Capitalized software Deferred Tax Liabilities, Property, Plant and Equipment, Tax Effected Deferred Tax Liabilities, Property, Plant and Equipment, Tax Effected Intangible assets Deferred Tax Liabilities, Intangible Assets, Tax Effected Deferred Tax Liabilities, Intangible Assets, Tax Effected Deferred acquisition costs Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost, Gross Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost, Gross Other Deferred Tax Liabilities, Other, Tax Effected Deferred Tax Liabilities, Other, Tax Effected Total deferred tax liabilities Deferred Tax Liabilities, Gross, Tax Effected Deferred Tax Liabilities, Gross, Tax Effected Net deferred income tax liability Deferred Tax Assets, Net, Tax Effected Deferred Tax Assets, Net, Tax Effected Deferred tax liability Deferred Tax Liabilities, Gross [Abstract] Capitalized software Deferred Tax Liabilities, Property, Plant and Equipment Intangible assets Deferred Tax Liabilities, Intangible Assets Deferred acquisition costs Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred income tax liability Schedule of Stock by Class [Table] Schedule of Stock by Class [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 [Member] IPO [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common stock offered and sold, (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 Maximum number of common stock shares granted to underwriters of IPO (in shares) Maximum Number of Common Stock Shares Granted to Underwriters of IPO Maximum Number of Common Stock Shares Granted to Underwriters of IPO Maximum number of common stock shares granted to underwriters of IPO, exercise price (in dollars per share) Maximum number of Common Stock Shares Granted to Underwriters of IPO, Exercise Price Maximum number of Common Stock Shares Granted to Underwriters of IPO, Exercise Price Proceeds from issuance initial public offering Proceeds from Issuance Initial Public Offering Underwriting fee and other offering expense Proceeds from Issuance Initial Public Offering, Net Proceeds from Issuance Initial Public Offering, Net Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] MAC Financial Holding Corporation and Subsidiaries [Member] MAC Financial Holding Corporation and Subsidiaries [Member] MAC Financial Holding Corporation and Subsidiaries [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Cash, common stock and warrants issued for acquisition Business Combination, Consideration Transferred, Cash and Equity Interests Issued and Issuable Business Combination, Consideration Transferred, Cash and Equity Interests Issued and Issuable Liabilities assumed in acquisition Business Combination, Consideration Transferred, Liabilities Incurred Common stock issued at inception Common stock issued Stock Issued During Period, Shares, Other Price per share Shares Issued, Price Per Share Payments of stock issuance costs Payments of Stock Issuance Costs Change in unrealized investment gains (losses), tax amount Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Significant Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Warrant Liability [Member] Warrant Liability [Member] Warrant Liability [Member] 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 Gain on settlement of warrants Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Issuance of common stock on warrant exercise Warrant Liability, Reduction, Transferred to Equity Warrant Liability, Reduction, Transferred to Equity Ending balance Statutory net loss Statutory Accounting Practices, Statutory Net Income Amount Statutory surplus 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. Schedule of Future Minimum Lease Payments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Summary of Investments, Other than Investments in Related Parties [Table] Summary of Investments, Other than Investments in Related Parties [Table] Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] Amortized Cost Fair Value Amount Reflected on Balance Sheet Summary of Investments, Other than Investments in Related Parties, Carrying Amount Schedule of Quarterly Financial Information Schedule of Quarterly Financial Information [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value, Inputs, Level 2 [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] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total assets Assets, Fair Value Disclosure Warrant liability Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate 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] Debt Disclosure [Abstract] Warrants Line of Credit and Related Warrants [Text Block] Line of Credit and Related Warrants [Text Block] Summary of Accounting Principles Significant Accounting Policies [Text Block] Schedule of Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Total bonds [Member] Bonds [Member] Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Amortized Cost, Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Amortized Cost, Due after one through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Amortized Cost, Due after five through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Amortized Cost, Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized Cost, Total Investments Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Fair Value, Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Fair Value, Due after one through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Fair Value, Due after five through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Fair Value Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Schedule of Equipment and Software Property, Plant and Equipment [Table Text Block] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Subsidiaries [Member] Subsidiaries [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Other underwriting and operating expenses Operating Expenses Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Net realized investment gains Total revenues Revenues Expenses Costs and Expenses [Abstract] Other operating expenses Total expenses Costs and Expenses Equity in net loss of subsidiaries Income (Loss) from Equity Method Investments Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Net loss Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Fixed maturities [Member] Fixed Maturities [Member] Cash equivalents [Member] Cash and Cash Equivalents [Member] Other [Member] Other Long-term Investments [Member] Investment income Investment Income Gross Investment Income Gross Investment expenses Investment Income, Investment Expense Net investment income Investment Income, Net 2015 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2016 Operating Leases, Future Minimum Payments, Due in Two Years 2017 Operating Leases, Future Minimum Payments, Due in Three Years Totals Operating Leases, Future Minimum Payments Due 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 Line of Credit Facility [Table] Line of Credit Facility [Table] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] 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 Warrants exercised Class of Warrant or Right, Number of Warrants Exercised During Period Class of Warrant or Right, Number of Warrants Exercised During Period Statutory Information Insurance Disclosure [Text Block] Organization and Basis of Presentation Business Description and Basis of Presentation [Text Block] Fixed maturity, amortized cost Available-for-sale Debt Securities, Amortized Cost Basis Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Less: Options exercised (in shares) Less: Options forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Less: Options canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Canceled in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Canceled in Period Less: Options expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Options ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Options beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Less: Options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Grant Date Fair Value Less: Options forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Less: Options expired (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Expired, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Expired, Weighted Average Grant Date Fair Value Less: Options canceled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Canceled Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Canceled Weighted Average Grant Date Fair Value Options ending balance (in dollars per share) Weighted Average Grant Date Fair Value per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Options beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Less: Options exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Less: Options forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Less: Options canceled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Canceled in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Canceled in Period, Weighted Average Exercise Price Less: Options expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Options beginning balance (in dollars per share) Financial Information of Registrant Parent Company Only Condensed Financial Information of Parent Company Only Disclosure [Text Block] Income Statement [Abstract] Premiums written Revenues [Abstract] Direct Direct Premiums Written Net premiums written Increase in unearned premiums Net premiums earned Underwriting and operating expenses Other Cost and Expense, Operating Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Net unrealized holding gains (losses) for the period included in accumulated other comprehensive loss, net of tax expense of $2,390, $0 and $0 for each of the years in the three-year period ended December 31, 2014, respectively Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Loss per share Earnings Per Share, Basic and Diluted [Abstract] Basic and diluted loss per share (in dollars per share) Reconciliation of Liability for Insurance Claims and Claims Expenses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] WISCONSIN [Member] WISCONSIN Number of states which require minimum amount of statutory capital relative to risk in force Number of States Which Require Minimum Amount of Statutory Capital Relative to Risk In Force Number of States Which Require Minimum Amount of Statutory Capital Relative to Risk In Force Risk-to-capital Required risk-to-capital ratio on agreements per GSE approval Required Risk-to-Capital Ratio on Agreements Per GSE Approval, Maximum Required Risk-to-Capital Ratio on Agreements Per GSE Approval, Maximum Mortgage insurance, percentage of indebtedness on single loan Mortgage Insurance, Percentage of Indebtedness on Single Loan, Limit Mortgage Insurance, Percentage of Indebtedness on Single Loan, Limit Number of Policies in Force Number of Policies in Force Number of Policies in Force Mortgage Insurance Risk in Force Shareholders' equity Ordinary dividends, restriction with regards to capital surplus Ordinary Dividends, Restriction with Regards to Capital Surplus This concept represents the maximum percentage of surplus as of the prior year that an insurer may pay out in ordinary dividends without prior approval of the Wisconsin Office of the Commissioner of Insurance under Wisconsin law.