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Fair Values of Assets and Liabilities Quantitative Information about Level 3 Assets Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans and fees receivable, at fair value $ 6,275 $ 6,353
Loans and fees receivable pledged as collateral under structured financings, at fair value $ 17,461 $ 20,353
Gross yield 25.30% 28.50%
Principal payment rate 2.70% 2.90%
Expected credit loss rate 11.60% 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 $ 6,275 $ 6,353
Loans And Fees Receivable [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Gross yield 24.40% 15.80%
Principal payment rate 2.60% 2.10%
Expected credit loss rate 11.00% 12.90%
Servicing rate 7.20% 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 27.70% 22.70%
Principal payment rate 3.00% 3.00%
Expected credit loss rate 24.00% 22.70%
Servicing rate 7.80% 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 25.60% 20.00%
Principal payment rate 2.80% 2.70%
Expected credit loss rate 15.70% 16.70%
Servicing rate 7.60% 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 $ 17,461 $ 20,353
Gross yield [1] 25.30% 28.50%
Principal payment rate [1] 2.70% 2.90%
Expected credit loss rate [1] 11.60% 12.50%
Servicing rate [1] 7.20% 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.