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Fair Values of Assets and Liabilities Quantitative Information about Level 3 Assets Fair Value Measurements (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans and fees receivable, at fair value $ 5,255 $ 6,353
Loans and fees receivable pledged as collateral under structured financings, at fair value $ 15,265 $ 20,353
Gross yield 24.00% 28.50%
Principal payment rate 2.60% 2.90%
Expected credit loss rate 11.10% 12.50%
Discount rate 16.10% 16.00%
Loans And Fees Receivable [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans and fees receivable, at fair value $ 5,255 $ 6,353
Loans And Fees Receivable [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Gross yield 27.90% 15.80%
Principal payment rate 1.90% 2.10%
Expected credit loss rate 11.80% 12.90%
Servicing rate 8.00% 8.40%
Discount rate 16.10% 16.00%
Loans And Fees Receivable [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Gross yield 33.10% 22.70%
Principal payment rate 3.50% 3.00%
Expected credit loss rate 25.50% 22.70%
Servicing rate 8.30% 12.50%
Discount rate 16.20% 16.20%
Loans And Fees Receivable [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Gross yield 29.70% 20.00%
Principal payment rate 2.90% 2.70%
Expected credit loss rate 16.50% 16.70%
Servicing rate 8.20% 10.90%
Discount rate 16.10% 16.10%
Loans and Fees Receivable Pledged as Collateral [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans and fees receivable, at fair value $ 15,265 $ 20,353
Gross yield [1] 24.00% 28.50%
Principal payment rate [1] 2.60% 2.90%
Expected credit loss rate [1] 11.10% 12.50%
Servicing rate [1] 8.00% 12.90%
Discount rate [1] 16.10% 16.00%
[1] (1) Our loans and fees receivable, pledged as collateral under structured financings, at fair value consist of a single portfolio with one set of assumptions. As such, no range is given.