Series A Preferred Stock [Member] Class of Stock [Axis] Series B Preferred Stock [Member] Finance receivables FairValueByAssetClass [Axis] Carrying Value [Member] FairValueByFairValueHierarchyLevel [Axis] Fair Value Inputs Level 1 [Member] Level 2 [Member] Level 3 [Member] CPS 2013-B [Member] Debt Security [Axis] CPS 2015-A [Member] CPS 2014-D [Member] CPS 2011-A [Member] CPS 2011-B [Member] CPS 2011-C [Member] CPS 2012-A [Member] CPS 2012-B [Member] CPS 2012-C [Member] CPS 2012-D [Member] CPS 2013-A [Member] CPS 2013-C [Member] CPS 2013-D [Member] CPS 2014-A [Member] CPS 2014-B [Member] CPS 2014-C [Member] Direct Mail Revenues Income Statement Location [Axis] Convenience Fee Revenue Recoveries on previously charged-off contracts Sales Tax Refunds Other Income Residual interest financing CreditFacility [Axis] Subordinated renewable notes Warehouse lines of credit Warehouse lines of credit (2) Debt secured by receivables measured at fair value Fair Value [Member] EligibleItemOrGroupForFairValueOption [Axis] Contractual Balance [Member] CPS 2015-C(3) [Member] Purchased in Open Market Stock Conversion Description [Axis] Net Exercises of outstanding options and warrants CPS 2015-B [Member] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Is Entity a Well-known Seasoned Issuer? Is Entity a Voluntary Filer? Is Entity's Reporting Status Current? Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Statement [Table] Statement [Line Items] ASSETS Cash and cash equivalents Restricted cash and equivalents Finance receivables Less: Allowance for finance credit losses Finance receivables, net Finance receivables measured at fair value Furniture and equipment, net Deferred financing costs Deferred tax assets, net Accrued interest receivable Other assets Total LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities Accounts payable and accrued expenses Warehouse lines of credit Residual interest financing Debt secured by receivables measured at fair value Securitization trust debt Subordinated renewable notes Total COMMITMENTS AND CONTINGENCIES Shareholders' Equity Preferred stock, $1 par value; authorized Common stock, no par value; authorized 75,000,000 shares; 26,150,459 and 24,540,640 shares issued and outstanding at June 30, 2015 and December 31, 2014 respectively Retained earnings Accumulated other comprehensive loss Total Total Preferred Stock, Par Value Preferred Stock, Authorized Preferred Stock, Issued Preferred Stock, Outstanding Common Stock, No Par Value Common Stock, Authorized Common Stock, Issued Common Stock, Outstanding Income Statement [Abstract] Revenues: Interest income Servicing fees Other income Total Expenses: Employee costs General and administrative Interest Provision for credit losses Marketing Occupancy Depreciation and amortization Total Income before income tax expense Income tax expense Net income Earnings per share: Basic Diluted Number of shares used in computing earnings per share: Basic Diluted Unaudited Condensed Consolidated Statements Of Comprehensive Income Net income Other comprehensive income/(loss); change in funded status of pension plan Comprehensive income Statement of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net income to net cash provided by operating activities: Accretion of deferred acquisition fees Accretion of purchase discount on receivables measured at fair value Amortization of discount on securitization trust debt Amortization of discount on senior secured debt, related party Accretion of premium on debt secured by receivables measured at fair value Mark to fair value on debt secured by receivables measured at fair value Mark to fair value of receivables measured at fair value Depreciation and amortization Amortization of deferred financing costs Stock-based compensation expense Interest income on residual assets Changes in assets and liabilities: Accrued interest receivable Deferred tax assets, net Other assets Accounts payable and accrued expenses Net cash provided by operating activities Cash flows from investing activities: Purchases of finance receivables held for investment Payments received on finance receivables held for investment Payments received on receivables portfolio at fair value Proceeds received on residual interest in securitizations Change in repossessions held in inventory Increases in restricted cash and cash equivalents, net Purchase of furniture and equipment Net cash used in investing activities Cash flows from financing activities: Proceeds from issuance of securitization trust debt Proceeds from issuance of subordinated renewable notes Payments on subordinated renewable notes Net proceeds from (repayments of) warehouse lines of credit Proceeds from (repayments of) residual interest financing debt Repayment of securitization trust debt Repayment of debt secured by receivables measured at fair value Repayment of senior secured debt, related party Payment of financing costs Purchase of common stock Exercise of options and warrants Net cash provided by financing activities Increase (decrease) in cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental disclosure of cash flow information: Cash paid during the period for: Interest Income taxes Accounting Policies [Abstract] Summary of Significant Accounting Policies Finance Receivables Finance Receivables Securitization Trust Debt Securitization Trust Debt Debt Disclosure [Abstract] Debt Interest Income And Interest Expense Interest Income and Interest Expense Earnings Per Share [Abstract] Earnings Per Share Income Tax Disclosure [Abstract] Income Taxes Legal Proceedings Legal Proceedings Employee Benefits Employee Benefits Fair Value Disclosures [Abstract] Fair Value Measurements Description of Business Basis of Presentation Use of Estimates Other Income Stock-based Compensation Purchases of Company Stock New Accounting Pronouncements Reclassifications Financial Covenants Provision for Contingent Liabilities Other Income Stock option activity Financial Receivables Delinquency status of finance receivables Allowance for credit losses Allowance for losses on repossessed inventory Securitization trust debt Debt Outstanding Interest Income And Interest Expense Tables Interest income Interest expense Computation of basic and diluted earnings per share Net periodic cost (benefit) Reconciliation of the acquired finance receivables and related debt measured at fair value on a recurring basis Comparision of fair values of the Fireside receivables and the related secured debt Reconciliation for level 3 assets Qualitative information about level 3 fair value measurements Estimated fair values of financial assets and liabilities Primary components of Other Income Other income for the period Number of Shares Outstanding options, beginning balance Granted Exercised Forfeited Outstanding options, ending balance Options exercisable Weighted Average Exercise Price Outstanding options, beginning balance Granted Exercised Forfeited Outstanding options, ending balance Options exercisable Weighted Average Remaining Contractual Term Weighted Average Remaining Contractual Term, beginning Weighted Average Remaining Contractual Term, ending Options exercisable Stock based compensation costs Unrecognized stock-based compensation costs Unrecognized stock-based compensation costs amortization period Aggregate intrinsic value outstanding Aggregate intrinsic value exercisable Options Exercised Total intrinsic value of options exercised Shares available for future grants Per share weighted average fair value of stock options granted Repurchase of common stock, shares repurchased Repurchase of common stock average share price Shares issued for conversion of options and warrants Proceeds from exercise of options and warrants Finance Receivables Automobile finance receivables, net of unearned interest Less: Unearned acquisition fees and originations costs Finance Receivables Current 31 - 60 days 61 - 90 days 91 + days Finance receivables Balance at beginning of period Provision for credit losses on finance receivables Charge-offs Recoveries Balance at end of period Gross balance of repossessions in inventory Allowance for losses on repossessed inventory Net repossessed inventory included in other assets Finance receivables Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Line Items] "Securitization trust debt," and components of debt Final Scheduled Payment Date Receivables Pledged at end of period Initial Principal Outstanding Principal Weighted Average Contractual Interest Rate end of period Restricted Cash for securitization trust debt Pre-funding proceeds Expected debt payments 2015 Expected debt payments 2016 Expected debt payments 2017 Expected debt payments 2018 Expected debt payments 2019 Expected debt payments 2020 Expected debt payments 2021 Receivables pledged Fair Value, Option, Qualitative Disclosures Related to Election [Table] Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] Credit Facility [Axis] Other debt outstanding Interest rate Maturity date Warehouse credit line Borrowing capacity description Line of credit outstanding Line of credit maturity date Amortization period for receivables pledged Interest Income Details Components of interest income Interest on Finance Receivables Residual interest income Other interest income Interest income Interest Expense Details Securitization trust debt Warehouse lines of credit Senior secured debt, related party Debt secured by receivables at fair value Residual interest financing Subordinated renewable notes Total interest expense Weighted average common shares - basic Incremental common shares attibutable to exercise of outstanding options and warrants Weighted average common shares - diluted Antidilutive common stock equivalents Unrecognized tax benefits Deferred tax asset U.S. federal deferred tax assets State deferred tax assets Net operating loss carryforward Effective income tax rate Components of net periodic cost (benefit) Service cost Interest cost Expected return on assets Amortization of transition (asset)/obligation Amortization of net (gain)/loss Net periodic cost (benefit) Plan contribution Finance Receivables Measured at Fair Value: Balance at beginning of period Payments on finance receivables at fair value Charge-offs on finance receivables at fair value Discount accretion Mark to fair value Balance at end of period Debt Secured by Finance Receivables Measured at Fair Value: Balance at beginning of period Principal payments on debt at fair value Premium accretion Mark to fair value Balance at end of period Reduction for principal payments collected and payable Adjusted balance at end of period Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan Disclosure [Line Items] Eligible Item or Group for Fair Value Option [Axis] Fair values of the Fireside receivables and the related secured debt to their contractual balances Fireside receivables portfolio Debt secured by Fireside receivables portfolio Asset Class [Axis] Debt secured by receivables measured at fair value Valuation Techniques Unobservable Inputs Discount rate Cumulative net losses Monthly average prepayments Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Hierarchy [Axis] Assets: Cash and cash equivalents Finance receivables, net Residual interest in securitizations Liabilities: Warehouse lines of credit Accrued interest payable Debt secured by receivables measured at fair value Securitization trust debt Subordinated renewable notes Accretion of deferred acquisition fees Adjusted balance at end of period Allowance For Losses On Repossessed Inventory. Allowance for losses on repossessed inventory table text block Cash paid (received) during the period for: abstract Change in repossessions in inventory Charge-offs on finance receivables at fair value Comparision of fair values of the Fireside receivables and the related secured debt table text block Contractual Balance Member. CPS2011A Member. CPS2011B Member. CPS2011C Member. CPS2012A Member. CPS2012B Member. CPS 2012 C member Custom Element. Debt Secured by Finance Receivables Measured at Fair Value Debt Secured By Fireside Receivables Portfolio. Debt Secured By Receivables Measured At FairValue. Debt Secured Receivables Fair Value. Delinquency status of finance receivables Discount accretion Fair values of the Fireside receivables and the related secured debt to their contractual balances Final scheduled payment date Finance Receivables Fair Value. Finance Receivables Measured at Fair Value: Fireside Receivables Portfolio. Interest expense on debt secured by receivables at fair value Interest expense table text block Mark to fair value Mark to fair value Number of Shares Other income policy text block Other income table text block Payments on finance receivables at fair value Payments on receivables portfolio at fair value Premium accretion Principal payments on debt at fair value Provision for Contingent Liabilities policy text block Purchases of Company Stock policy text block Purchases of finance receivables held for investment Reduction for principal payments collected and payable Repurchase of common stock average share price Residual interest debt interest expense Residual Interest Financing Member. Residual Interest Income. Pre-funding proceeds on securitization trust debt Securitization Trust Debt Fair Value Disclosure. Securitization Trust Debt Initial Principal Subordinated Renewable Notes. Weighted Average Exercise Price Weighted Average Remaining Contractual Term Weighted Average Remaining Contractual Term, beginning Proceeds from exercise of options and warrants Expected debt payments 2021 Amortization period for receivables pledged Unobservable Inputs Unobservable input - discount rate Unobservable input - cumulative net losses Unobservable input - monthly average prepayments Loans and Leases Receivable, Gross, Consumer Financing Receivable, Allowance for Credit Losses Loans and Leases Receivable, Net Amount, Consumer Assets Line of Credit, Current Other Secured Financings Financial and Nonfinancial Liabilities, Fair Value Disclosure Subordinated Debt Liabilities [Default Label] Stockholders' Equity Attributable to Parent Liabilities and Equity Revenues Direct Operating Costs Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Accretion (Amortization) of Discounts and Premiums, Investments Depreciation, Depletion and Amortization Interest Income, Other Increase (Decrease) in Accrued Interest Receivable, Net Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Other Operating Assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations PurchasesOfFinanceReceivablesHeldForInvestment Payments for (Proceeds from) Loans Receivable ChangeInRepossessionsInInventory Increase (Decrease) in Restricted Cash for Operating Activities Payments to Acquire Property, Plant, and Equipment Net Cash Provided by (Used in) Investing Activities, Continuing Operations Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Repayments of Other Debt Repayments of Secured Debt Repayments of Financial Services Obligations Payments of Financing Costs Payments for Repurchase of Common Stock Net Cash Provided by (Used in) Financing Activities, Continuing Operations Cash and Cash Equivalents, Period Increase (Decrease) Interest Paid, Net Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block] Long-term Debt [Text Block] Legal Matters and Contingencies [Text Block] Compensation and Employee Benefit Plans [Text Block] OtherIncomePolicyTextBlock OtherIncomeTableTextBlock Schedule of Maturities of Long-term Debt [Table Text Block] Interest and Other Income [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term Proceeds from Sale and Collection of Finance Receivables [Abstract] Allowance for Doubtful Accounts Receivable, Write-offs AllowanceForLossesOnRepossessedInventory1 Repossessed Assets Financing Receivable, Recorded Investment, Nonaccrual Status Interest Expense, Debt Interest Expense, Other ResidualInterestDebtInterestExpense Interest Expense, Subordinated Notes and Debentures Defined Benefit Plan, Net Periodic Benefit Cost MarkToFairValueLiability Debt Instrument, Fair Value Disclosure Cash and Cash Equivalents, Fair Value Disclosure Lines of Credit, Fair Value Disclosure DebtSecuredReceivablesFairValue SecuritizationTrustDebtFairValueDisclosure Subordinated Debt Obligations, Fair Value Disclosure