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Fair Values of Assets and Liabilities Summary of Fair Value Hierarchy for Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and fees receivable, net for which it is practicable to estimate fair value [1] $ 293,972 $ 223,783
Loans and fees receivable, at fair value [1] 11,109 15,648
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and fees receivable, net for which it is practicable to estimate fair value [1] 0 0
Loans and fees receivable, at fair value [1] 0 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and fees receivable, net for which it is practicable to estimate fair value [1] 0 0
Loans and fees receivable, at fair value [1] 0 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and fees receivable, net for which it is practicable to estimate fair value [1] 324,945 248,171
Loans and fees receivable, at fair value [1] 11,109 15,648
Loans And Fees Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and fees receivable, at fair value $ 1,869 $ 3,484
[1] For cash, deposits and other short-term investments, the carrying amount is a reasonable estimate of fair value.