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[Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] 5.50% Cap Interest Rate [Member] Five Point Five Percent Cap Interest Rate [Member] 5.5% Cap Interest Rate [Member] 5.50% Cap Interest Rate Additional [Member] InterestRateAdditionalFivePointFiveCap [Member] InterestRateAdditionalFivePointFiveCap [Member] 6.50% Cap Interest Rate [Member] Six Point Five Percent Cap Interest Rate [Member] Six Point Five Percent Cap Interest Rate [Member] 6.50% Cap Interest Rate Additional [Member] InterestRateAdditionalSixPointFiveCap [Member] Interest Rate Additional Six Point Five Cap [Member] 6.50% Cap Interest Rate Second Additional [Member] InterestRateSecondAdditionalSixPointFiveCap [Member] InterestRateSecondAdditionalSixPointFiveCap [Member] 5.00% Cap Interest Rate [Member] cacc_FivePercentCapInterestRate [Member] cacc_FivePercentCapInterestRate [Member] Derivative [Line Items] Derivative [Line Items] Debt facility financing amount Debt Instrument, Face Amount Notional Amount 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Payments of Dealer Holdback Payments of Dealer Holdback The cash outflow for payments made to dealers under our Portfolio Program from the portion of the collections on the underlying consumer loans that exceed amounts retained by us to recover the advance balance, certain collection costs, and our servicing fee. Loans And Leases Receivable Transfers Loans And Leases Receivable Transfers Loans and leases receivable transfers. Allowance for Loan and Lease Losses, Write-offs Allowance for Loan and Lease Losses, Write-offs Recoveries Allowance for Loan and Lease Loss, Recovery of Bad Debts Deferral of Loan Origination Costs Deferral of Loan Origination Costs Deferral of Loan Origination Costs Balance, end of period Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Other Assets [Member] Other Assets [Member] Revolving Secured Line of Credit [Member] Line of Credit [Member] Secured financings [Member] Secured financings [Member] Secured financings [Member] Senior Notes [Member] Senior Notes [Member] Mortgages [Member] Mortgages [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Principal Outstanding Debt Instrument, Principal Outstanding Debt Instrument, Principal Outstanding Unamortized Debt Issuance Costs Unamortized Debt Issuance Expense Unamortized Discount Debt Instrument, Unamortized Discount Carrying Amount Debt Instrument, Fair Value Disclosure Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] U.S. federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State income taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Excess tax benefits from stock-based compensation plans Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective tax rate Effective Income Tax Rate Reconciliation, Percent Schedule of Principal Debt Outstanding Schedule of Principal Debt Outstanding [Table Text Block] Schedule of Principal Debt Outstanding [Table Text Block] Schedule of General Information of Financing Transaction Schedule of Debt [Table Text Block] Schedule of Additional Information Related to Debt Instruments Schedule Of Additional Information Related To Debt Instruments [Table Text Block] Schedule Of Additional Information Related To Debt Instruments [Table Text Block] Summary of Debt Schedule of Long-term Debt Instruments [Table Text Block] Summary of Term ABS Financings ScheduleOfAssetBackedDebtInstrumentsTextBlock [Table Text Block] ScheduleOfAssetBackedDebtInstrumentsTextBlock [Table Text Block] Equity [Abstract] Stock Repurchases [Text Block] Stock Repurchases [Text Block] The entire disclosure for an entity's stock repurchases, including the description of the share repurchase program authorized by an entity's board of directors, the number of shares repurchased, the cost of the shares repurchased, the remaining maximum dollar value of shares available for repurchase under the program, and other information necessary to a fair presentation. Earnings Per Share [Abstract] Net Income Per Share Earnings Per Share [Text Block] Other Income and Expenses [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Ancillary Product Profit Sharing [Member] Ancillary product profit sharing [Member] Ancillary product profit sharing [Member] Remarketing Fees [Member] Remarketing Fees [Member] Remarketing Fees [Member] Interest [Member] Interest [Member] Interest [Member] Dealer Enrollment Fees [Member] Dealer Enrollment Fees [Member] Dealer Enrollment Fees [Member] Dealer Support Products And Services [Member] Dealer Support Products And Services [Member] Dealer Support Products And Services [Member] GPS-SID Fees [Member] GPS-SID Fees [Member] GPS-SID Fees [Member] Other [Member] Other [Member] Other [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Other income Other Income Insurance [Abstract] Net assumed written premiums Assumed Premiums Written Net premiums earned Premiums Earned, Net Provision for claims Policyholder Benefits and Claims Incurred, Net Amortization of capitalized acquisition costs Amortization of Acquisition Costs Schedule of Terms of Interest Rate Cap Agreements Schedule of Interest Rate Derivatives [Table Text Block] Other Income and Other Expense Disclosure [Text Block] Other Income and Other Expense Disclosure [Text Block] Contractual net cash flows at the time of assignment Loans Receivable Contractual Net Cash Flows At Assignment Loans Receivable Contractual Net Cash Flows At Assignment Expected net cash flows at the time of assignment Loans Receivable Expected Net Cash Flows At Assignment Loans Receivable Expected Net Cash Flows At Assignment Fair value at the time of assignment Loans Receivable Fair Value Of Net Cash Flows At Assignment Loans Receivable Fair Value Of Net Cash Flows At Assignment Provision for Loan and Lease Losses Expected future finance charges at the time of assignment Expected future finance charges at the time of assignment Expected future finance charges at the time of assignment New Consumer Loan assignments Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions Realized Net Cash Flows Realized Net Cash Flows Realized Net Cash Flows Expected net Loan income at the time of assignment Expected net Loan income at the time of assignment Expected net Loan income at the time of assignment Schedule of Reconciliation of the U.S. Federal Statutory Rate to Effective Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Stock Repurchases Class of Treasury Stock [Table Text Block] Share-based Payment Arrangement, Noncash Expense [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] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Restricted Stock [Member] Restricted Stock [Member] 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] Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Summary of Reinsurance Activity Schedule Of Reinsurance Activity [Table Text Block] The tabular disclosure pertaining to the existence, magnitude and information about insurance that has been ceded to or assumed from another insurance company, including the methodologies and assumptions used in determining recorded amounts. 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Number Of Shares Authorized To Be Repurchased Increase Remaining number of shares authorized for repurchase Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Loan Pool Performance Meets Or Exceeds Initial Estimates [Member] Loan Pool Performance Meets Or Exceeds Initial Estimates [Member] Loan Pool Performance Meets Or Exceeds Initial Estimates [Member] Loan Pool Performance Less Than Initial Estimates [Member] Loan Pool Performance Less Than Initial Estimates [Member] Loan Pool Performance Less Than Initial Estimates [Member] Allowance for credit losses SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] Summary of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Trust Assets And Reinsurance Liabilities [Axis] Trust Assets And Reinsurance Liabilities [Axis] Trust Assets And Reinsurance Liabilities Axis Trust Assets And Reinsurance 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[Member] TermAssetBackedSecuredFinancingsTwoThousandTwentyOne [Member] 2021 Senior Notes [Member] Two Thousand Twenty One Senior Notes [Member] Two Thousand Twenty One Senior Notes [Member] 2023 Senior Notes [Member] Two Thousand Twenty Three Senior Notes [Member] Two Thousand Twenty Three Senior Notes [Member] 2024 Senior Notes [Member] Two Thousand Twenty Four Senior Notes [Member] Two Thousand Twenty Four Senior Notes [Member] 2026 Senior Notes [Member] Two Thousand Twenty Six Senior Notes [Member] Two Thousand Twenty Six Senior Notes [Member] Balance outstanding Long-term Line of Credit Secured Debt Secured Debt Balance outstanding Senior Notes, Noncurrent Amount available for borrowing Line of Credit Facility, Remaining Borrowing Capacity Amount available for borrowing Debt Instrument Amount Available For Borrowing Debt Instrument Amount Available For Borrowing Loans pledged as collateral Loans Pledged as Collateral Restricted cash and cash equivalents pledged as collateral Interest rate Line of Credit Facility, Interest Rate at Period End Interest rate Debt Instrument, Interest Rate, Effective Percentage Mortgage note Forecast changes Certain Loans Acquired In Transfer Accounted For As Loans Accretable Yield Reclassifications From Nonaccretable Difference Forecast Changes Change in the estimate of cash flows expected to be collected, after acquisition of a loan, which results in an increase in accretable yield (for example, if actual cash flows are significantly greater than previously expected). This relates to loans with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. Certain Loans Acquired In Transfer Accounted For As Loans Accretable Yield Reclassifications From Nonaccretable Difference Forecast Changes, By Percentage Certain Loans Acquired In Transfer Accounted For As Loans Accretable Yield Reclassifications From Nonaccretable Difference Forecast Changes, By Percentage Certain Loans Acquired In Transfer Accounted For As Loans Accretable Yield Reclassifications From Nonaccretable Difference Forecast Changes, By Percentage Schedule of Loans Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Summary of Changes in Loans Receivable Schedule Of Changes In Loans Receivable And Allowance For Credit Losses [Table Text Block] Schedule Of Changes In Loans Receivable And Allowance For Credit Losses [Table Text Block] Summary of Provision for Credit Losses [Table Text Block] Summary of Provision for Credit Losses [Table Text Block] Summary of Provision for Credit Losses [Table Text Block] Summary of Information Related to New Consumer Loan Assignments Schedule Of New Consumer Loan Assignments [Table Text Block] Schedule of new consumer loan assignments. Summary of Changes in Expected Future Net Cash Flows [Table Text Block] Summary of Changes in Expected Future Net Cash Flows [Table Text Block] Summary of Changes in Expected Future Net Cash Flows [Table Text Block] Schedule of Consumer Loans Forecasted Collection Percentage Schedule Of Consumer Loans Forecasted Collection Percentage [Text Block] Schedule Of Consumer Loans Forecasted Collection Percentage [Text Block] Financing Receivable, Past Due [Table Text Block] Financing Receivable, Past Due [Table Text Block] Schedule of COVID-19 Adjustment to Forecasted Collection Percentage [Table Text Block] Schedule of COVID-19 Adjustment to Forecasted Collection Percentage [Table Text Block] Schedule of COVID-19 Adjustment to Forecasted Collection Percentage [Table Text Block] Summary of Changes in Accretable Yield Summary Of Changes In Accretable Yield [Table Text Block] Summary of changes in the accretable yield. Schedule of Consumer Loans Performance Schedule Of Consumer Loans Performance [Table Text Block] Schedule Of Consumer Loans Performance [Table Text Block] Within one year, cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Within one year, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Over one year to five years, cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Over one year to five years, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Over five years to ten years, cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Over five years to ten years, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Over ten years, cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Over ten years, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Total restricted securities available for sale, cost Debt Securities, Available-for-sale, Amortized Cost Total restricted securities available for sale Loans Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Schedule of Weighted Average Shares Outstanding Basic and Diluted Schedule of Weighted Average Number of Shares [Table Text Block] Initial Forecasted Collection Percentage Loans Receivable Initial Forecasted Collection Percentage Loans Receivable Initial Forecasted Collection Percentage Variance In Forecasted Collection Percentage From Prior Quarter End Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter End Loans Receivable Variance In Forecasted Collection Percentage From Prior Quarter End Variance In Forecasted Collection Percentage From Prior Year End Loans Receivable Variance In Forecasted Collection Percentage From Prior Year End Loans Receivable Variance In Forecasted Collection Percentage From Prior Year End Variance In Initial Forecasted Collection Percentage Loans Receivable Variance In Initial Forecasted Collection Percentage Loans Receivable Variance In Initial Forecasted Collection Percentage Allowance for Loan and Lease Losses [Roll Forward] Allowance for Loan and Lease Losses [Roll Forward] Transfers Allowance for Loan and Lease Losses, Adjustments, Other Write-offs Recoveries Balance, end of period Common shares Weighted Average Number of Shares Issued, Basic Vested restricted stock units Weighted Average Number of Shares, Restricted Stock Basic number of weighted average shares outstanding Weighted Average Number of Shares Outstanding, Basic Dilutive effect of restricted stock and restricted stock units Dilutive Securities Restricted Stock And Restricted Stock Units Dilutive securities restricted stock and restricted stock units. Dilutive number of weighted average shares outstanding Weighted Average Number of Shares Outstanding, Diluted Shares outstanding excluded from calculation of diluted net income per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Credit Score, FICO [Axis] Credit Score, FICO [Axis] Credit Score, FICO [Domain] Credit Score, FICO [Domain] Percentage Of Contracts With FICO Score Lower Than 650 Or No FICO Score [Member] FICO Score Lower Than 650 Or No FICO Score [Member] FICO Score Lower Than 650 Or No FICO Score [Member] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Percentage Of Contracts Percentage Of Contracts Percentage Of Contracts Schedule of Cash and Cash Equivalents [Table Text Block] Schedule of Cash and Cash Equivalents [Table Text Block] Income Statement [Abstract] Revenue: Revenues [Abstract] Finance Charges Revenue Premiums earned Total revenue Revenues Costs and expenses: Costs and Expenses [Abstract] Salaries and wages Labor and Related Expense General and administrative General and Administrative Expense Sales and marketing Selling and Marketing Expense Provision for credit losses Interest Interest Expense Loss on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt Total costs and expenses Costs and Expenses Income (loss) before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision (benefit) for income taxes Income Tax Expense (Benefit) Net income (loss) Net Income (Loss) Attributable to Parent Net income (loss) per share: Earnings Per Share, Basic and Diluted [Abstract] Basic (in usd per share) Earnings Per Share, Basic Diluted (in usd per share) Earnings Per Share, Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic (in shares) Diluted (in shares) Reinsurance [Text Block] Reinsurance [Text Block] Restricted Securities Available for Sale Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] ASSETS: Assets [Abstract] Cash and cash equivalents Loans receivable Loans receivable, net Property and equipment, net Property, Plant and Equipment, Net Income taxes receivable Income Taxes Receivable Other assets Other Assets Total Assets Assets LIABILITIES AND SHAREHOLDERS' EQUITY: Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Revolving secured line of credit Secured financing Senior notes Deferred Income Tax Liabilities, Net Deferred Income Tax Liabilities, Net Income taxes payable Accrued Income Taxes Total Liabilities Liabilities Commitments and Contingencies - See Note 15 Commitments and Contingencies Shareholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value, 1,000,000 shares authorized, none issued Preferred Stock, Value, Issued Common stock, $0.01 par value, 80,000,000 shares authorized, 17,649,478 and 18,352,779 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively Common Stock, Value, Issued Paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total Shareholders' Equity Stockholders' Equity Attributable to Parent Total Liabilities and Shareholders' Equity Liabilities and Equity Description Of Business [Table] Description Of Business [Table] Description Of Business [Table] Payments For Proceeds From Loans Receivable Programs [Axis] Payments For Proceeds From Loans Receivable Programs [Axis] Payments For Proceeds From Loans Receivable Programs Axis Payments For Proceeds From Loans Receivable Programs [Domain] Payments For Proceeds From Loans Receivable Programs [Domain] Payments For Proceeds From Loans Receivable Programs Domain Portfolio Program [Member] Portfolio Program [Member] Portfolio Program Member Purchase Program [Member] Purchase Program [Member] Purchase Program Member Description Of Business [Line Items] Description Of Business [Line Items] Description Of Business [Line Items] Percentage of new consumer loans unit volume Percentage Of New Consumer Loans In Unit Volume Percentage of new consumer loans in unit volume Percentage of new consumer loans dollar volume Percentage of new consumer loans dollar volume Percentage of new consumer loans dollar volume Schedule of Stock Based Compensation Expense Share-based Payment Arrangement, Cost by Plan [Table Text Block] Summary of Restricted Stock Activity Schedule Of Share-Based Compensation, Restricted Stock, Activity [Table Text Block] Schedule Of Share-Based Compensation, Restricted Stock, Activity [Table Text Block] Summary Of Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Certain Loans Acquired in Transfer Not Accounted for as Loans Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Balance, beginning of period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Provision for credit losses Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications (to) from Nonaccretable Difference Transfers Certain Loans Acquired In Transfer Accounted For As Loans Accretable Yield Transfers Certain Loans Acquired In Transfer Accounted For As Loans Accretable Yield Transfers Balance, end of period Commitments and Contingencies Disclosure [Abstract] Litigation and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Stock-Based Compensation Plans Share-based Payment Arrangement [Text Block] Business Segment Information Segment Reporting, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Securities, Available-for-sale Marketable Securities, Policy [Policy Text Block] Loans Receivable and Allowance for Credit Losses Policy Loans Receivable, Policy [Policy Text Block] Finance Charges Revenue [Policy Text Block] Reinsurance Reinsurance Accounting Policy [Policy Text Block] New Accounting Updates New Accounting Pronouncements, Policy [Policy Text Block] Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Adjustments to reconcile cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation Amortization Amortization of Debt Issuance Costs and Discounts Provision (benefit) for deferred income taxes Deferred Income Tax Expense (Benefit) Stock-based compensation Other Other Operating Activities, Cash Flow Statement Change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Increase (decrease) in accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Increase in income taxes receivable Increase (Decrease) in Income Taxes Receivable Decrease in income taxes payable Increase (Decrease) in Income Taxes Payable Decrease in other assets Increase (Decrease) in Other Operating Assets Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of restricted securities available for sale Payments to Acquire Available-for-sale Securities Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from Sale of Debt Securities, Available-for-sale Maturities of restricted securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Principal collected on Loans receivable Proceeds from Loan and Lease Originations and Principal Collections Advances to Dealers Advances To Dealers The cash outflow for non-recourse payments made to dealers under a portfolio program in exchange for the right to service the underlying consumer loans. Purchases of Consumer Loans Payments to Acquire Loans Receivable Accelerated payments of Dealer Holdback Payments of Dealer Holdback Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash 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] Borrowings under revolving secured line of credit Proceeds from Long-term Lines of Credit Repayments under revolving secured line of credit Repayments of Long-term Lines of Credit Proceeds from secured financing Proceeds from Issuance of Secured Debt Repayments of secured financing Repayments of Secured Debt Proceeds from issuance of senior notes Proceeds from Issuance of Senior Long-term Debt Repayment of senior notes Repayments of Senior Debt Payments of debt issuance costs and debt extinguishment costs Payments of Debt Issuance Costs Repurchase of common stock Payments for Repurchase of Common Stock Other Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase in cash and cash equivalents and restricted cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents and restricted cash and cash equivalents beginning of period Cash and cash equivalents and restricted cash and cash equivalents end of period Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Information [Abstract] Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid during the period for income taxes Income Taxes Paid, Net Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Member] Restricted Cash And Cash Equivalents [Member] Restricted Cash And Cash Equivalents Summary Of Significant Accounting Policies [Line Items] Number of reportable segments Number of Reportable Segments Uninsured cash and cash equivalents Cash, Uninsured Amount CECL Impact on Net Income CECL Impact on Net Income CECL Impact on Net Income CECL Impact on Net Income, Per Diluted Share CECL Impact on Net Income, Per Diluted Share CECL Impact on Net Income, Per Diluted Share Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Third Party Providers [Member] Third Party Providers [Member] Third Party Providers [Member] Dealers [Member] Dealers [Member] Dealers [Member] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Transferred over Time [Member] Transferred over Time [Member] Transferred at Point in Time [Member] Transferred at Point in Time [Member] Debt Debt Disclosure [Text Block] Payment Holdback Percentage Payment Holdback Percentage Payment Holdback Percentage One-time enrollment fee in program Revenue From Enrollment And Registration Fees In Program Revenue From Enrollment And Registration Fees In Program Available-for-sale Securities, Amortized Cost Basis 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 Estimated Fair Value Close Date Debt financing close date Debt financing close date Net Book Value of Loans Contributed at Closing Net Book Value Of Loans Pledged As Collateral Net Book Value Of Loans Pledged As Collateral Maturity Date Debt Instrument, Maturity Date Schedule of Restricted Securities Available for Sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Restricted Securities Available for Sale by Aging Category Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Schedule of Cost and Estimated Fair Values of Debt Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Percentage of Consumer Loans Assigned with FICO Score of Less Than 650 or No FICO Score Financing Receivable Credit Quality Indicators [Table Text Block] Schedule of Percentage of Consumer Loans Assigned Based on Unit Volumes Schedule Of Percentage Of Consumer Loans Assigned Based On Unit Volumes [Table Text Block] Schedule Of Percentage Of Consumer Loans Assigned Based On Unit Volumes Table Text Block Cover [Abstract] Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Outstanding, Nonvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding, Nonvested Weighted Average Grant-Date Fair Value Per Share, Non-vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value Per Share, Non-vested, Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value Per Share, Non-vested, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value Per Share, Non-vested, Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value Per Share, Non-vested Number of business programs Number Of Business Programs Number Of Business Programs Original number of Consumer Loans required to group advances Original Number Of Consumer Loans Required To Group Advances Original Number Of Consumer Loans Required To Group Advances Additional number of Consumer Loans required to group advances Additional Number Of Consumer Loans Required To Group Advances Additional Number Of Consumer Loans Required To Group Advances Servicing fee percentage in collections Service Fee Income As Percentage Of Collections Service fee income as a percentage of collections. Maximum outstanding balance Line of Credit Facility, Maximum Amount Outstanding During Period Average outstanding balance Line of Credit Facility, Average Outstanding Amount Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR [Member] London Interbank Offered Rate (LIBOR) [Member] Prime Rate [Member] Prime Rate [Member] Warehouse Facilities [Member] Warehouse Facilities [Member] Warehouse facilities member. Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Line of credit facility Line of Credit Facility, Maximum Borrowing Capacity Percentage of net book value of loans Percentage Of Net Book Value Of Loans Percentage of net book value of loans, maximum. Maximum hedging reserve Maximum Hedging Reserve Maximum hedging reserve Number of warehouse facilities Number Warehouse Facilities Number Warehouse Facilities Debt Instrument, Issuer Debt Instrument, Issuer Percentage of collections on contributed loans Percentage of collections on contributed loans Percentage of collections on contributed loans Monthly servicing fee per financing Monthly Servicing Fee Per Financing Monthly Servicing Fee Per Financing Debt financing close date Close date, secured financings Debt Instrument, Issuance Date Senior notes stated interest rate Debt Instrument, Interest Rate, Stated Percentage Debt maturity date Redemption price, percentage of principal amount redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Senior notes yield to maturity Debt covenants Debt Instrument Covenant Net Income For Past Two Quarters Debt Instrument Covenant Net Income For Past Two Quarters Net Book Value Of Loans Pledged As Collateral Schedule Of Other Income [Table Text Block] Schedule Of Other Income [Table Text Block] Schedule Of Other Income [Table Text Block] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), net of tax: OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract] Unrealized gain (loss) on securities, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Balance, beginning of period Expected Future Net Cash Flows Expected Future Net Cash Flows New Consumer Loan Assignments Transfers Transfer of Expected Future Net Cash Flows between Programs Transfer of Expected Future Net Cash Flows between Programs Balance, end of period Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Restricted stock units converted to common stock, shares Conversion of Stock, Shares Converted Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures Outstanding Weighted Average Grant-Date Fair Value Per Share, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value The weighted average fair value of awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Weighted Average Grant-Date Fair Value Per Share, Non-vested, Converted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value Per Share, Outstanding Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Commercial Paper Offered Rate [Member] Commercial Paper Offered Rate [Member] Commercial Paper Offered Rate [Member] Line of credit maturity date Line of Credit Facility, Expiration Date Financing Amount Debt facility financing amount Basis spread on variable rate 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] Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Balance, shares Restricted stock awards, net of forfeitures, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Common stock repurchased, shares Restricted stock units converted to common stock, shares Balance, shares Balance Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Common stock repurchased, value Balance Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]