Available-for-sale Securities Debt Maturities Rolling after Year Five Amortized Cost Basis Due after 5 years Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the fifth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Accrued expenses Amount of deferred tax liability attributable to taxable temporary differences from accrued liabilities. Deferred Tax Liabilities Tax Deferred Expense Reserves and Accruals Accrued Liabilities Receivable for securities Represents the carrying amounts due, as of the balance sheet date, for securities. Receivable for Securities Liability for Unpaid Claims and Claims Adjustment Expense Prior Years Reserve for losses and LAE, for prior years Liability, as of the balance sheet date, for amounts representing estimated cost of settling unpaid claims for prior years under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. Common Class B-2 [Member] Class B-2 Share Represents the B-2 classification of common stock that has different rights than provided to Class A or B-1 shares, representing ownership interest in a corporation. Class B-2 Loans and Leases Receivable Consumer Mortgage Insured Down Payment Percentage Residential mortgage down payment percentage for which mortgage insurance is generally required Represents the percentage of the total sale price that a home buyer contributes in cash towards the purchase of a home for which mortgage insurance is generally required. Other Underwriting and Operating Expenses Other underwriting and operating expenses Represents the aggregate amount of costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with, and are not primarily related to the acquisition or renewal of insurance contracts and other operating costs, that are associated with the entity's normal revenue producing operation. Represents the cash outflow associated with the asset purchase agreement. Payments under Asset Purchase Agreement Payments under Asset Purchase Agreement Payments for Investor Fee Investor fee payment Represents the cash outflow for investor fee. Document and Entity Information Amendment Description Investment Issuer [Axis] Available for Sale Securities Accumulated Gross Unrealized Loss Before Tax Unrealized Losses Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax Amendment Flag Investment Issuer [Domain] Represents the amount before the allocation of valuation allowance for deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Deferred Tax Assets (Liabilities), Net before Valuation Allowance Net deferred tax asset before valuation allowance Deferred Tax Assets, Start Up Expenses Net Start-up expenditures, net Represents the amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from net start-up expenditures. Deferred Tax Assets, Organizational Expenses Organizational expenditures Represents the amount before the allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from organizational expenditures. Statutory Accounting Statutory Accounting Disclosure [Text Block] Statutory Accounting Represents the entire disclosure pertaining to the statutory accounting. Essent Guaranty, Inc [Member] Essent Guaranty Represents information pertaining to Essent Guaranty, Inc. (Essent Guaranty), a regulated and licensed wholly-owned subsidiary of the reporting entity. Represents information pertaining to Essent Guaranty of PA, Inc. (Essent PA). Essent Guaranty of PA, Inc [Member] Essent PA Represents the amount of statutory surplus (stockholders' equity), as of the balance sheet date, using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. Statutory Accounting Practices, Statutory Surplus Balance Statutory surplus Statutory Accounting Practices, Statutory Contingency Reserve Liability Contingency reserve liability Represents the amount of contingency reserve liability, as of the balance sheet date, using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. Statutory Accounting Practices, Increase (Decrease) in Contingency Reserve Increase in contingency reserve Represents the amount of increase (decrease) in contingency reserve. Schedule of nature of operations and basis of presentation. Schedule of Nature of Operations and Basis of Presentation [Table] Nature of operations and basis of presentation Schedule of Nature of Operations and Basis of Presentation [Line Items] Available for Sale Securities Accumulated Gross Unrealized Gain Before Tax Unrealized Gains Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax Third Anniversary Vesting [Member] Vesting on the third anniversary Represents information pertaining to the vesting of equity-based compensation on the third anniversary of the employee's date of hire. Fourth Anniversary Vesting [Member] Vesting on the fourth anniversary Represents information pertaining to the vesting of equity-based compensation on the fourth anniversary of the employee's date of hire. Fifth Anniversary Vesting [Member] Vesting on the fifth anniversary Represents information pertaining to the vesting of equity-based compensation on the fifth anniversary of the employee's date of hire. Current Fiscal Year End Date Award Type [Axis] Amount used to derive Investment Percentage, denominator Represents the amount used as a denominator to derive Investment Percentage under the equity-based compensation plan. Share Based Compensation Arrangement by Share Based Payment Award Amount Used to Derive Investment Percentage Denominator BERMUDA Bermuda Grant Date Vesting [Member] Vesting on grant date Represents information pertaining to the vesting of equity-based compensation on the grant date. Due after 5 years Amount of available-for-sale debt securities at fair value maturing after the fifth rolling twelve months following the latest balance sheet presented. Available-for-sale Securities Debt Maturities Rolling after Year Five Fair Value Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss 12 months or more Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. Commentary guidance Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. Commentary guidance Total Class A Common Share Subscription Agreement and related legal documents Represents the Shareholders Agreement, Class A Common Share Subscription Agreement (the Subscription Agreement) and certain other related legal documents (collectively, the Agreements), as amended. Shareholders Agreement Class A Common Share Subscription Agreement and Related Legal Documents as Amended [Member] Represents the total consideration earned as of the balance sheet date under the equity funding arrangement. Equity Funding Arrangement Total Fee Earned Total fee earned to date by Macquarie Commentary guidance Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss Less than 12 months Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. Equity Funding Arrangement Macquarie Capital Services, Initial Closing Shareholders [Member] Represents information pertaining to the entity's equity funding agreement with Macquarie Capital (USA) Inc. (Macquarie) to provide services in connection with the sale of shares to shareholders who were party to a share subscription agreement at the initial closing. Macquarie equity funding arrangement Equity Funding Arrangement Fee Percentage Represents the consideration to be transferred under the equity funding arrangement, expressed as a percentage of the gross proceeds from the sale of shares. Fee as percentage of the gross proceeds from sale of shares Represents the maximum potential fee, undiscounted, that could be paid under the equity funding arrangement. Fee as percentage of the gross proceeds from sale of shares, maximum amount Equity Funding Arrangement Maximum Potential Consideration Document Period End Date Represents the number of loans in default. Number of Loans in Default Loans in default at end of period Before Tax Accumulated Other Comprehensive Income (Loss) Before Tax [Roll Forward] Accumulated Other Comprehensive Income (Loss) Tax Effect [Roll Forward] Tax Effect Accumulated Other Comprehensive Income (Loss) Tax Balance at beginning of period Represents the tax expense (benefit) on the amount of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources attributable to the parent entity. Balance at end of period Income Taxes [Line Items] Income Taxes Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward] Net of Tax Income Taxes [Table] Disclosures pertaining to income taxes. Schedule of Shares Earned Unvested Performance Shares [Table Text Block] Schedule of portion of nonvested Common Shares earned based upon achievement of compounded annual book value per share growth Tabular disclosure of shares earned for unvested performance shares. Percentage of weighted average statutory tax rate applicable to pretax income (loss). Effective Income Tax Rate Reconciliation at Weighted Average Statutory Income Tax Rate Tax provision at weighted average statutory rates (as a percent) Entity [Domain] Non-deductible expenses (as a percent) Effective Income Tax Rate Reconciliation Weighted Average Statutory Income Tax Rate Non-deductible Expense Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the weighted average statutory income tax rate to pretax income (loss) from continuing operations attributable to nondeductible expenses. Tax exempt interest (as a percent) Effective Income Tax Rate Reconciliation Weighted Average Statutory Income Tax Rate Tax Exempt Income Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the weighted average statutory income tax rate to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. Change in valuation allowance (as a percent) Effective Income Tax Rate Reconciliation Weighted Average Statutory Income Tax Rate Change in Deferred Tax Assets Valuation Allowance Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the weighted average statutory income tax rate to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. Arrangements and Non-arrangement Transactions [Domain] Other (as a percent) Effective Income Tax Rate Reconciliation Weighted Average Statutory Income Tax Rate Other Adjustments Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the weighted average statutory income tax rate to pretax income (loss) from continuing operations attributable to other adjustments. Other senior management Senior Management Excluding Chief Executive Officer [Member] Represents senior management of the entity, excluding its chief executive officer (CEO). Employee [Member] Employees Represents information pertaining to an employee. Compounded Annual Book Value Per Share Growth 11% Represents information pertaining to 11% compounded annual book value per share growth achieved. Compounded Annual Book Value Per Share Growth Achieved 11 Percent [Member] Compounded Annual Book Value Per Share Growth Achieved 12 Percent [Member] Compounded Annual Book Value Per Share Growth 12% Represents information pertaining to 12% compounded annual book value per share growth achieved. Compounded Annual Book Value Per Share Growth Achieved 13 Percent [Member] Compounded Annual Book Value Per Share Growth 13% Represents information pertaining to 13% compounded annual book value per share growth achieved. Compounded Annual Book Value Per Share Growth Achieved 14 Percent [Member] Compounded Annual Book Value Per Share Growth 14% Represents information pertaining to 14% compounded annual book value per share growth achieved. Compounded Annual Book Value Per Share Growth Achieved 15 Percent [Member] Compounded Annual Book Value Per Share Growth 15% Represents information pertaining to 15% compounded annual book value per share growth achieved. Stock Conversion Ratio Ratio for conversion into common shares Represents the ratio applied to the conversion of one type of equity or a class of equity into another type of equity, with the former equity shares divided by the new equity shares. Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Granted Percentage Shares granted (as a percent) Represents the grants made during the period on other than stock (or unit) option plans, expressed as a percentage. Share Based Compensation Arrangement by Share Based Payment Award Performance Period Performance period Represents the period over which a performance condition to the award is measured, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Share Based Compensation Arrangement by Share Based Payment Award Vesting Period on Completion of Performance Period Vesting period on completion of performance period Represents the period, following completion of the performance period, which an employee's right to exercise an award is no longer contingent on satisfaction of a service condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Issuance of Class A and Class B-2 common shares net of issuance cost of $1,143 Equity impact of the value of new stock issued during the period to investors in a private placement. Stock Issued During Period Value New Issues Private Placement Issuance of Common Shares net of issuance cost of $25,546 Stock Issued During Period Value New Issues Initial Public Offering Equity impact of the value of new stock issued during the period in an initial public offering. Essent Group Limited 2013 Long Term Incentive Plan [Member] 2013 Plan Represents the Essent Group Limited 2013 Long-term Incentive Plan (2013 Plan). Represents a share based compensation award with vesting based on a combination of length of service and achievement of performance conditions. Vesting Based on Service and Performance [Member] Time and Performance-Based Vesting Based on Service [Member] Time-Based Represents a share based compensation award with vesting based on length of service. Share Based Compensation Arrangement by Share Based Payment Award, Annual Number of Additional Shares Authorized Increase in number of authorized shares on the first day of each fiscal year Represents the number of additional shares that may be authorized for issuance annually under an established share-based compensation plan. Share Based Compensation Arrangement by Share Based Payment Award, Annual Additional Shares Authorized as Percentage of Outstanding Shares Increase in number of authorized shares on the first day of each fiscal year, as a percentage of outstanding Common Shares (as a percent) Represents the additional shares that may be authorized for issuance annually under an established share-based compensation plan, expressed as a percentage of the entity's outstanding shares. Compounded Annual Book Value Per Share Growth Rate Compounded Annual Book Value Per Share Growth (as a percent) Represents the compounded annual book value per share growth rate, expressed as a percentage. Income Tax Reconciliation Income Tax Expense Benefit at Weighted Average Income Tax Rate The amount of income tax expense or benefit for the period computed by applying the weighted average income tax rate to pretax income from continuing operations. Tax provision at weighted average statutory rates Other information Available-for-sale Securities, Other Disclosure Items [Abstract] Income Tax Reconciliation at Weighted Average Income Tax Rate Nondeductible Expense Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the weighted average income tax rate to pretax income (loss) from continuing operations attributable to nondeductible expenses. Non-deductible expenses Income Tax Reconciliation at Weighted Average Income Tax Rate Tax Exempt Income Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the weighted average income tax rate to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. Tax-exempt interest Income Tax Reconciliation at Weighted Average Income Tax Rate Valuation Allowance Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the weighted average income tax rate to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Change in valuation allowance Income Tax Reconciliation at Weighted Average Income Tax Rate Other Adjustments Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the weighted average income tax rate to pretax income (loss) from continuing operations attributable to other adjustments. Other Amount of deferred tax liability attributable to taxable temporary differences from contingency reserves. Contingency reserves Deferred Tax Liabilities Contingency Reserves Income Tax Reconciliation at Weighted Average Income Tax Rate and Actual Rate Difference in estimated full-year rate and year-to-date actual rate Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the estimated full-year weighted average income tax rate and the year-to-date actual weighted average income tax rate to pretax income (loss) from continuing operations. Effective Income Tax Rate Reconciliation, Estimated Weighted Average Statutory Income Tax Rate and Actual Weighted Average Statutory Income Tax Rate, Difference Difference in estimated full-year rate and year-to-date actual rate (as a percent) Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the estimated full-year weighted average statutory income tax rate and the year-to-date actual weighted average statutory income tax rate to pretax income (loss) from continuing operations. Schedule of Effective Income Tax Rate Reconciliation at Weighted Average Income Tax Rate [Table Text Block] Schedule of reconciliation of difference between income tax expense (benefit) and expected tax provision at weighted average tax rate Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying the weighted average statutory tax rate to pretax income from continuing operations. Common Class A and Class B-2 [Member] Class A and Class B-2 Common Shares Represents information in the aggregate pertaining to Class A and Class B-2 classifications of common stock representing ownership interest in a corporation. Prepaid federal income tax Mortgage Guaranty Insurer United States Mortgage Guaranty Tax and Loss Bonds Represents, for a mortgage guaranty insurer, the amount of investment in United States Mortgage Guaranty Tax and Loss Bonds issued by the Treasury Department for eligibility for certain tax deductions under enacted tax laws. Represents, for a mortgage guaranty insurer, the increase (decrease) during the reporting period in the amount of investment in United States Mortgage Guaranty Tax and Loss Bonds issued by the Treasury Department for eligibility for certain tax deductions under enacted tax laws. Prepaid federal income tax Increase (Decrease) in Mortgage Guaranty Insurer United States Mortgage Guaranty Tax and Loss Bonds T& L Bonds purchased Special revenue bonds Special Revenue Municipal Bonds [Member] A municipal bond whose debt service is payable solely from the revenues derived from operating the facilities acquired or constructed with the proceeds of the bonds. General Obligation Municipal Bonds [Member] General obligation bonds A bond secured by a pledge of the issuer's taxing powers (limited or unlimited). More commonly the general obligation bonds of local governments are paid from ad valorem property taxes and other general revenues. Considered the most secure of all municipal debt. Tax Allocation Municipal Bonds [Member] Tax allocation bonds Bonds issued in conjunction with a redevelopment project. The taxes pledged to their repayment come from the increase of assessed value over and above a pre-established base. The redevelopment creates this added value, known as the tax increment. Certification of Participation Bonds [Member] Certification of participation bonds Represents a type of financing where an investor purchases a share of the lease revenues of a program rather than the bond being secured by those revenues. Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Gain on the sale of investments, net Realized investment gains, net Operating Leases, Future Minimum Payments, Due in Five Years and Thereafter 2018 and thereafter Amount of required minimum rental payments maturing after the fourth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. Amount of United States Mortgage Guaranty Tax and Loss Bonds Purchased Since Inception Total amount of T&L Bonds purchased since inception Represents the total amount of United States Mortgage Guaranty Tax and Loss Bonds (T&L Bonds) purchased since inception. Essent Reinsurance Ltd [Member] Essent Re Represents information pertaining to Essent Reinsurance, Ltd. (Essent Re), a wholly-owned Bermuda domiciled reinsurer of the reporting entity. Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Legal Entity [Axis] Document Type Accounts Payable, Underwriters, Promoters, and Employees (Other than Salaries and Wages), Current Fee payable Accounts Receivable, Net Accounts receivable Accounts receivable, net Total accounts receivable Accounts Receivable, Gross Accounts Receivable Accounts Receivable, Net [Abstract] Accretion Expense Amortization of discount on payments due under Asset Purchase Agreement UNITED STATES United States Accrued Investment Income Receivable Accrued investment income Property and equipment, accumulated depreciation (in dollars) Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Balance at beginning of period Balance at end of period Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) Balance at beginning of period Balance at end of period Accumulated Other Comprehensive Income (Loss), before Tax Additional Paid in Capital, Common Stock Additional paid-in capital Additional Paid-in Capital [Member] Additional Paid-In Capital Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation expense Excess tax benefits from stock-based compensation expense Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Common stock, issuance cost Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Allocated Share-based Compensation Expense Compensation expense Less: Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable Antidilutive Securities [Axis] Antidilutive shares: Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive shares Asset-backed securities Asset-backed Securities [Member] Asset backed securities Assets Total assets Assets [Abstract] Assets Assets, Fair Value Disclosure Less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Due after 1 but within 5 years Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value Schedule of investments available for sale Available-for-sale Securities [Table Text Block] Less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] Due in 1 year Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Due after 5 but within 10 years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis Due after 1 but within 5 years Total Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss Amortized Cost Available-for-sale Securities, Amortized Cost Basis [Abstract] Due in 1 year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 12 months or more Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss 12 months or more Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Due in 1 year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Available-for-sale Securities Fair Value Total investments available for sale Total investments Subtotal Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Due after 10 years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis Fixed maturities Subtotal Available-for-sale Securities, Debt Maturities, Single Maturity Date Gross Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract] Periodic payments throughout Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Due after 10 years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis Due in 1 year Amortized Cost Available-for-sale Securities, Amortized Cost Basis Total investments available for sale Due after 1 but within 5 years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Periodic payments throughout Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Available-for-sale Securities [Abstract] Investments available for sale, at fair value Fair Value Unrealized Losses Available-for-sale Securities, Gross Unrealized Loss Due after 1 but within 5 years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Due after 5 but within 10 years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis Realized gross gains and losses on the sale of investments available for sale Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract] Fair value of investments deposited with insurance regulatory authorities Available-for-sale Securities, Restricted Realized gross losses Available-for-sale Securities, Gross Realized Losses Realized gross gains Available-for-sale Securities, Gross Realized Gains Unrealized Gains Available-for-sale Securities, Gross Unrealized Gain Available-for-sale Securities, Gross Realized Gain (Loss) Benefits, Losses and Expenses [Abstract] Losses and expenses: Benefits, Losses and Expenses Total losses and expenses Amounts due under Asset Purchase Agreement Business Combination, Contingent Consideration, Liability Accrual of additional liability associated with the Asset Purchase Agreement Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Carrying Amount Reported Value Measurement [Member] Cash Cash Cash and Cash Equivalents, Period Increase (Decrease) Net (decrease) increase in cash Cash and Cash Equivalents, at Carrying Value Cash at beginning of year Cash at end of period Chief Executive Officer Chief Executive Officer [Member] Class of Stock [Line Items] Equity funding Class of Stock [Domain] Commitments and Contingencies Commitments and Contingencies. Commitments and contingencies Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Common Shares, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common Class A [Member] Class A Class A common shares Common Shares Common Stock [Member] Common Shares, $0.015 par value: Authorized - 233,333; issued - 86,528 shares in 2014 and 86,491 shares in 2013 Common Stock, Value, Issued Common Shares, issued Common Stock, Shares, Issued Common Shares, authorized Common Stock, Shares Authorized Number of shares approved for issuance Common Stock, Capital Shares Reserved for Future Issuance Components of the net deferred tax asset Components of Deferred Tax Assets [Abstract] Components of income tax expense (benefit) Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Components of the net deferred tax (liability) asset Components of Deferred Tax Assets and Liabilities [Abstract] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Corporate debt securities Corporate Debt Securities [Member] Current Current Income Tax Expense (Benefit) Fixed assets Deferred Tax Assets, Property, Plant and Equipment Unrealized (gain) on investments Deferred Tax Liabilities, Investments Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses Unrealized loss on investments Deferred Tax Assets, Investments Unrealized loss (gain) on investments Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross Deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax benefit recognized Deferred Other Tax Expense (Benefit) Deferred Policy Acquisition Costs Deferred policy acquisition costs Deferred Net deferred tax benefit recognized Deferred Income Tax Expense (Benefit) Deferred income tax benefit Deferred income tax provision (benefit) Deferred Tax Assets, Net Net deferred tax asset Net deferred tax asset Deferred tax assets Deferred Tax Assets, Gross Nonvested shares Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Net deferred tax (liability) asset Deferred Tax Assets, Net [Abstract] Accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards Alternative minimum tax credit carryforward Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Deferred policy acquisition costs Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost Valuation allowance Deferred Tax Assets, Valuation Allowance Valuation allowance Unearned premium reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve Net deferred tax liability Deferred Tax Liabilities, Net Net deferred tax liability Loss reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves Depreciation, Depletion and Amortization Depreciation and amortization Director Director [Member] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Less : Dividends declared Dividends, Common Stock Earnings Per Share, Basic and Diluted [Abstract] Earnings per share: Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings per Share (EPS) Earnings Per Share [Text Block] Earnings Per Share, Basic Basic (in dollars per share) Basic earnings per share (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Earnings per share (EPS)) Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings per Share (EPS) Total income tax expense (benefit) (as a percent) Effective Income Tax Rate Reconciliation, Percent % of pretax income Effective Income Tax Rate Reconciliation, Percent [Abstract] Statutory rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Income tax benefit Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Total unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Expected weighted average period for recognition of expense Employee-related Liabilities Accrued payroll and bonuses Equity Component [Domain] Fair Value Total Estimate of Fair Value Measurement [Member] Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Measurement Frequency [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Recurring basis Fair Value, Measurements, Recurring [Member] Fair Value, Measurement Frequency [Domain] Measurement Basis [Axis] Fair value of financial instruments Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value of Financial Instruments Fair Value Hierarchy [Domain] Schedule of assets measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Estimated fair values and carrying amounts of financial instruments Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, by Balance Sheet Grouping [Table] Fair Value Measurement [Domain] Schedule of estimated fair values and related carrying amounts of financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Quoted Prices in Active Markets for Identical Instruments (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Liabilities Financial Liabilities Fair Value Disclosure Financial Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Financial Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Fixed maturities Fixed Maturities [Member] Gain (Loss) on Sale of Investments Gross investment income Gross Investment Income, Operating Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income taxes Income Taxes Income Taxes Income Tax Disclosure [Text Block] Income Tax Expense (Benefit) Income tax expense (benefit) Total income tax expense (benefit) Reconciliation of difference between income tax expense (benefit) and expected tax provision at weighted average tax rate Effective Income Tax Rate Reconciliation, Amount [Abstract] Income tax payments Income Taxes Paid Increase (Decrease) in Accounts Receivable Accounts receivable (Increase) Decrease in Unearned Premiums, Net Increase in unearned premiums Increase (Decrease) in Accrued Investment Income Receivable Accrued investment income Increase (Decrease) in Deferred Policy Acquisition Costs Deferred policy acquisition costs Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Increase (Decrease) in Deferred Income Taxes Net deferred tax asset Increase (Decrease) in Operating Capital [Abstract] Change in: Increase (Decrease) in Loss and Loss Adjustment Expense Reserve Reserve for losses and LAE Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) of Restricted Investments Increase (Decrease) in Unearned Premiums Unearned premium reserve Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Dilutive effect of nonvested shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Dilutive effect of nonvested contingently issuable share awards (in shares) Indemnifications related to contract underwriting services Indemnification Agreement [Member] Reserve for Losses and Loss Adjustment Expenses Investment Income, Amortization of Premium Amortization of premium on investment securities Investments [Domain] Schedule of net investment income Investment Income [Table Text Block] Investment expenses Investment Income, Investment Expense Investment Type [Axis] Investment Secondary Categorization [Axis] Investment Owned, Percent of Net Assets Percentage of total investments Investments by Secondary Categorization [Domain] Schedule of amortized cost and fair values of available for sale securities by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Investments Available for Sale Investments Available for Sale Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investor [Member] Investors Liabilities and Equity Total liabilities and stockholders' equity Liabilities [Abstract] Liabilities Liabilities Total liabilities Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity Financial and Nonfinancial Liabilities, Fair Value Disclosure Reserve for losses and LAE at beginning of period Reserve for losses and LAE at end of period Liability for Unpaid Claims and Claims Adjustment Expense, Gross Reserve for Losses and Loss Adjustment Expenses Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Deduct payments for losses and LAE, net of reinsurance, occurring in: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Current period Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Net loss and LAE payments during the current period Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Net incurred losses during the current period Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Liability for Unpaid Claims and Claims Adjustment Expense, Net Reserve for losses and LAE Net reserve for losses and LAE at beginning of period Net reserve for losses and LAE at end of period Reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses (LAE) Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Current period Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year Add provision for losses and LAE, net of reinsurance, occurring in: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Amount paid for remedies Loss Contingency Accrual, Payments Loss Contingency, Nature [Domain] Loss Contingencies [Table] Commitments and contingencies Loss Contingencies [Line Items] Loss Contingency Nature [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Maximum Maximum [Member] Less than Greater than or equal to Minimum [Member] Money market funds Money Market Funds [Member] Mortgage-backed securities Mortgage-backed Securities, Issued by Private Enterprises [Member] Mortgage-backed securities Collateralized Mortgage Backed Securities [Member] Municipal debt securities Municipal Bonds [Member] Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Financing Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating Activities Net Income (Loss) Available to Common Stockholders, Basic Net income Net income Net loss Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Investing Activities Net Investment Income Net investment income Net investment income Noncash Investing and Financing Items [Abstract] Noncash Transactions Number of states in which the entity is licensed to write mortgage insurance Number of States in which Entity Operates Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Future minimum lease payments of all non-cancelable operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2017 Operating Leases, Future Minimum Payments, Due in Four Years 2016 Operating Leases, Future Minimum Payments, Due in Three Years 2014 Operating Leases, Future Minimum Payments Due, Next Twelve Months Minimum sublease rental income Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals 2015 Operating Leases, Future Minimum Payments, Due in Two Years Total minimum payments required Operating Leases, Future Minimum Payments Due Nature of Operations and Basis of Presentation Nature of Operations and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Other comprehensive income (loss) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Less: Reclassification adjustment for gains included in net income (1) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Less: Reclassification adjustment for gains included in net income (1) Less: Reclassification adjustment for gains included in net income (1) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Other-than-temporary impairments Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Other Assets Other assets Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized holding gains (losses) arising during the period Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Unrealized holding gains (losses) arising during the period Unrealized holding gains (losses) arising during the period Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Other Income Other income Other Accrued Liabilities Other accrued liabilities Other receivables Other Receivables Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income (loss) Other comprehensive income (loss): Net unrealized gains (losses) on investments Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent Other comprehensive income (loss): Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Net unrealized gains (losses) on investments Change in unrealized appreciation (depreciation) of investments, net of tax expense (benefit) of $2,095 and $(2,043) in the three months ended June 30, 2014 and 2013 and $2,465 and $(2,182) in the six months ended June 30, 2014 and 2013. Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Other comprehensive income (loss): Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total other comprehensive income (loss) Other comprehensive income (loss) Net unrealized gains (losses) on investments Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent Change in unrealized appreciation (depreciation) of investments, tax expense (benefit) Payables to Broker-Dealers and Clearing Organizations Payable for securities Payments for Repurchase of Common Stock Treasury stock acquired Net change in short-term investments Payments for (Proceeds from) Short-term Investments Payments to Acquire Available-for-sale Securities Purchase of investments available for sale Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment, net Payment of offering costs Payments of Stock Issuance Costs Performance Shares [Member] Performance-based share awards Plan Name [Domain] Plan Name [Axis] Policyholder Benefits and Claims Incurred, Net Provision for losses and LAE Premiums receivable Premiums Receivable, Gross Premiums Written, Net Net premiums written Premiums Earned, Net Net premiums earned Prior Period Reclassification Adjustment Increase (Decrease) amount Proceeds from Contributions from Parent Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from maturity of investments available for sale Proceeds from Issuance of Common Stock Issuance of common shares net of costs Proceeds from Sale of Available-for-sale Securities Proceeds from sales of investments available for sale Property, Plant and Equipment, Net Property and equipment (at cost, less accumulated depreciation of $38,013 in 2014 and $36,796 in 2013 Range [Axis] Range [Domain] Accounts Receivable Registration Payment Arrangement by Arrangement [Axis] Registration Payment Arrangement, Maximum Potential Consideration Registration Payment Arrangement, Arrangement [Domain] Registration Payment Arrangement, Accrual Carrying Value Reinsurance percentage Reinsurance Retention Policy, Reinsured Risk, Percentage Less: Reinsurance recoverables Plus: Reinsurance recoverables Reinsurance Recoverables Related Party Transaction [Domain] Related Party Transaction [Axis] Related Party [Axis] Related Party [Domain] Nonvested share units Restricted Stock Units (RSUs) [Member] Restricted Stock [Member] Restricted stock Nonvested shares Retained Earnings [Member] Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Retained earnings (accumulated deficit) Revenues Total revenues Revenues [Abstract] Revenues: Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Percentage of vesting Nonvested Common Shares Earned (as a percent) Scenario, Forecast [Member] Expected Scenario, Unspecified [Domain] Schedule of Available-for-sale Securities [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of realized gross gains and losses on sale of investments available for sale Schedule of Realized Gain (Loss) [Table Text Block] 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 [Table Text Block] Schedule of components of net deferred tax (liability) asset Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary of nonvested Common Share and nonvested Common Share unit activity Schedule of Share-based Compensation, Activity [Table Text Block] Schedule of future minimum lease payments of all non-cancelable operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of reconciliation of net income and weighted average common shares outstanding used in computations of basic and diluted earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of fair value of investments in an unrealized loss position and related unrealized losses Schedule of Unrealized Loss on Investments [Table Text Block] Investments available for sale Schedule of Available-for-sale Securities [Line Items] Fair value of investments in an unrealized loss position and the related unrealized losses Schedule of compensation expense, net of forfeitures, and related tax effects recognized in connection with nonvested shares Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of investments available for sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Rollforward of accumulated other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Components of net investment income Net Investment Income [Line Items] Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Schedule of reconciliation of beginning and ending reserve balances for losses and loss adjustment expenses (LAE) Investment Income [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Stock by Class [Table] Schedule of accounts receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Geographical [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Additional information Number of Shares 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, Grants in Period Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Granted (in dollars per share) Outstanding at beginning of year (in shares) Outstanding at end of period (in shares) Share awards outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Stock-based compensation expense Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted Average Grant Date Fair Value Stock-based compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Outstanding at beginning of year (in dollars per share) Outstanding at end of period (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 Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Total fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Number of shares available for future grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Shares authorized Equity Award [Domain] Total shares issued as of beginning of year Shares, Issued Shares Paid for Tax Withholding for Share Based Compensation Shares tendered by employees to pay employee withholding taxes Short-term Investments Short-term investments Short-term investments Short-term Investments [Member] Scenario [Axis] Statement [Table] Statement Statement [Line Items] Condensed Consolidated Statements of Changes in Stockholders' Equity Geographical [Axis] Condensed Consolidated Statements of Cash Flows Equity Components [Axis] Condensed Consolidated Statements of Comprehensive Income Condensed Consolidated Balance Sheets Class of Stock [Axis] Schedule of statutory net income, statutory surplus and contingency reserve liability Statutory Accounting Practices Disclosure [Table Text Block] Statutory Accounting Practices [Table] Statutory net income Statutory Accounting Practices, Statutory Net Income Amount Statutory accounting Statutory Accounting Practices [Line Items] Conversion of Class A and Class B-2 common shares into Common Shares Stock Issued During Period, Value, Conversion of Convertible Securities Stock Issued Issuance of management incentive shares (see Note 6) Stock Stock Compensation Plan [Member] Stock Issued During Period, Value, Share-based Compensation, Forfeited Forfeiture of management incentive shares Stock Issued During Period, Value, Share-based Compensation, Gross Issuance of management incentive shares Stock Issued During Period, Shares, New Issues Shares issued Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Equity Stockholders' Equity, Period Increase (Decrease) Stockholders' Equity Attributable to Parent Total stockholders' equity Balance Balance Equity Funding Equity Funding Stockholders' Equity Note Disclosure [Text Block] Share split ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Subsequent Events Subsequent Events [Text Block] Subsequent Events Subsequent Event [Table] Subsequent events Subsequent Event [Line Items] Subsequent Events Subsequent Event [Member] Subsequent Event Type [Domain] Subsequent Event Type [Axis] Supplemental Disclosure of Cash Flow Information Supplemental Cash Flow Information [Abstract] Treasury Stock, Value, Acquired, Cost Method Treasury stock acquired Treasury Stock, Shares Treasury stock, shares Cancellation of treasury stock Treasury Stock, Retired, Cost Method, Amount Treasury Stock [Member] Treasury Stock Treasury Stock, Value Type of Arrangement and Non-arrangement Transactions [Axis] Undistributed Earnings, Basic [Abstract] Undistributed earnings Undistributed net income Undistributed Earnings, Basic Unearned Premiums Unearned premium reserve Unrecognized tax benefits Unrecognized Tax Benefits U.S. agency securities US Government Agencies Debt Securities [Member] US Government Corporations and Agencies Securities [Member] U.S. agency U.S. Treasury securities US Treasury Securities [Member] Vesting [Axis] Vesting [Domain] Weighted average Weighted Average [Member] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average common shares outstanding: Weighted Average Number of Shares, Contingently Issuable Weighted average contingently issuable share awards outstanding (in shares) Basic (in shares) Basic weighted average common shares outstanding Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Diluted weighted average common shares outstanding Quota Share Reinsurance Transaction [Member] Quota share reinsurance transaction Represents an agreement between an insurer and a reinsurer whereby the reinsurer pays an agreed-upon percentage of all losses the insurer sustains. Insurance, Coverage for Single Pool of Loans Represents the coverage for a single pool of loans acquired by the insured, as provided by the insurance agreement. Potential losses insured on pool of loans Freddie Mac Agency Credit Insurance Structure Insurance Policy [Member] Freddie Mac's Agency Credit Insurance Structure insurance policy Represents the insurance policy issued in connection with Freddie Mac's Agency Credit Insurance Structure. Fannie Mae Pool of Loans Insurance [Member] Fannie Mae pool of loans insurance Represents insurance on a Fannie Mae pool of loans.