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Stock Options Valuation Assumptions, Expected Term, Maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Increase in income taxes receivable Increase (Decrease) in Income Taxes Receivable Unrecognized Tax Benefits, Income Tax Penalties Expense Unrecognized Tax Benefits, Income Tax Penalties Expense Net assumed written premiums Assumed Premiums Written Effective Income Tax Rate Reconciliation, Deduction, Percent Effective Income Tax Rate Reconciliation, Deduction, Percent Three Year Vesting [Member] Three Year Vesting [Member] Three Year Vesting [Member] Line of credit facility Financing Amount Line of Credit Facility, Maximum Borrowing Capacity 2024 Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs In Three Years Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs In Three Years Matching contribution Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Options, Nonvested, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Current Fiscal Year End Date Current Fiscal Year End Date Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Building and improvements Buildings and Improvements, Gross Line of credit facility decrease in maximum borrowing capacity Line Of Credit Facility Future Decrease in Maximum Borrowing Capacity Line Of Credit Facility Future Decrease in Maximum Borrowing Capacity Statement [Table] Statement [Table] Loans Originating in 2019 [Member] Loans Originating in 2019 [Member] Loans Originating in 2019 [Member] Asset-backed Securities [Member] Asset-backed Securities [Member] Advertising expense Advertising Expense New Accounting Updates New Accounting Pronouncements, Policy [Policy Text Block] Other, net Deferred Tax Assets, Other Term ABS 2021-2 [Member] TermAssetBackedSecuredFinancingsTwoThousandTwentyOneTwo [Member] TermAssetBackedSecuredFinancingsTwoThousandTwentyOneTwo [Member] Dealer Support Products And Services [Member] Dealer Support Products And Services [Member] Dealer Support Products And Services [Member] Schedule Of Effect Of Derivative Instruments Not Designated As Hedging Instruments In Consolidated Statements Of Income Derivatives Not Designated as Hedging Instruments [Table Text Block] Percentage of Claims Paid During Period Three [Member] Percentage of Claims Paid During Period Three [Member] Percentage of Claims Paid During Period Three [Member] Accelerated payments of Dealer Holdback Accelerated Dealer Holdback payments Accelerated Payments of Dealer Holdback The cash outflow for payments made to dealers under our Portfolio Program at the time a pool of 100 or more consumer loans is closed by dealers with a single open pool or at the time 100 consumer loans have been collectively assigned by dealers with multiple open pools. Warehouse Facility IV [Member] Warehouse Facility IV [Member] Warehouse Facility IV Member Current, Pre-term [Member] Current, Pre-term [Member] Current, Pre-term Mortgage [Member] Mortgages [Member] Over ten years, cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Cumulative Paid Claims [Line Items] Cumulative Paid Claims [Line Items] [Line Items] for Cumulative Paid Claims [Table] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Increase in number of shares authorized for repurchase Stock Repurchase Program Number Of Shares Authorized To Be Repurchased Increase Stock Repurchase Program Number Of Shares Authorized To Be Repurchased Increase Deferred state net operating loss Deferred Tax Assets, Operating Loss Carryforwards, State and Local Term ABS 2018-3 [Member] TermAssetBackedSecuredFinancingsTwoThousandEighteenThree [Member] TermAssetBackedSecuredFinancingsTwoThousandEighteenThree [Member] Description Of Business Nature of Operations [Text Block] Adjustments to reconcile cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Credit Score, FICO [Domain] Credit Score, FICO [Domain] Trust Assets And Reinsurance Liabilities [Axis] Trust Assets And Reinsurance Liabilities [Axis] Trust Assets And Reinsurance Liabilities Axis Within one year, estimated fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Reinsurance Reinsurance Accounting Policy [Policy Text Block] Loans pledged as collateral Loans Pledged as Collateral Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Trust Assets [Member] Trust Assets [Member] Trust Assets Member Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Maximum matching contribution Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Deferred provision for income taxes Deferred Income Tax Expense (Benefit) Options Nonvested, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term