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Fair Values of Assets and Liabilities Quantitative Information about Level 3 Liabilities Fair Value Measurements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Notes payable associated with structured financings, at fair value $ 9,240 $ 12,276
Gross yield 25.90% 24.60%
Principal payment rate 2.50% 2.20%
Expected credit loss rate 9.40% 11.80%
Discount rate 14.20% 13.60%
Loans And Fees Receivable [Member] | Minimum [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Gross yield 15.80% 24.20%
Principal payment rate 1.90% 2.20%
Expected credit loss rate 9.40% 11.80%
Discount rate 6.00% 5.80%
Fair Value Inputs Servicing Rate 10.20% 8.60%
Loans And Fees Receivable [Member] | Maximum [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Gross yield 27.40% 35.80%
Principal payment rate 3.60% 3.50%
Expected credit loss rate 10.40% 18.00%
Discount rate 14.20% 13.60%
Fair Value Inputs Servicing Rate 12.30% 9.60%
Loans And Fees Receivable [Member] | Weighted Average [Member]    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]    
Gross yield 24.50% 26.10%
Principal payment rate 2.60% 2.40%
Expected credit loss rate 9.70% 12.90%
Discount rate 12.80% 12.50%
Fair Value Inputs Servicing Rate 10.50% 8.80%