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Fair Values of Assets and Liabilities, Other Relevant Data (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Fair Value Assets And Liabilities [Line Items]    
Aggregate unpaid principal balance of notes payable $ 241,675 $ 287,711
Loans and Fees Receivable, at Fair Value [Member]
    
Schedule of Fair Value Assets And Liabilities [Line Items]    
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value 21,213 26,154
Aggregate fair value of loans and fees receivable that are reported at fair value 15,662 20,378
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) 29 36
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable 799 1,643
Loans and Fees Receivable Pledged as Collateral under Structured Financings, at Fair Value [Member]
    
Schedule of Fair Value Assets And Liabilities [Line Items]    
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value 144,322 192,433
Aggregate fair value of loans and fees receivable that are reported at fair value 107,258 133,595
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) 415 957
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable 6,116 7,591
Structured Financing Notes Payable [Member]
    
Schedule of Fair Value Assets And Liabilities [Line Items]    
Aggregate fair value of notes payable $ 113,613 $ 140,127