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Fair Value of Assets and Liabilities - Sensitivity of Fair Value of Loans Invested in by the Company (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans Invested in by Company            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair value of loans invested in by the Company   $ 597,055 $ 565,802 $ 54,849 $ 24,781 $ 25,911
Loans Invested in by Company | Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair value of loans invested in by the Company $ 524,928 $ 597,055        
Expected weighted-average life (in years) 1 year 6 months 1 year 6 months        
Minimum | Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impact of adverse change in discount rate $ (6,132) $ (7,449)        
Impact of adverse change in discount rate (percent) 1.00%          
Impact of adverse change in credit loss rates on underlying loans $ (8,334) (10,090)        
Impact of adverse change in credit loss rates on underlying loans (percent) 10.00%          
Impact of adverse change in expected prepayment rates $ (2,021) (3,548)        
Impact of adverse change in expected prepayment rates (percent) 10.00%          
Maximum | Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impact of adverse change in discount rate $ (12,121) (14,715)        
Impact of adverse change in discount rate (percent) 2.00%          
Impact of adverse change in credit loss rates on underlying loans $ (16,581) (18,935)        
Impact of adverse change in credit loss rates on underlying loans (percent) 20.00%          
Impact of adverse change in expected prepayment rates $ (3,969) $ (5,894)        
Impact of adverse change in expected prepayment rates (percent) 20.00%