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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Residential loans, at lower of cost or fair value    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Loans, at lower of cost or fair value $ 866 $ 866
Gain (loss) on assets measured at fair value on a non-recurring basis 18 21
Residential loans, at lower of cost or fair value | Level 1    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Loans, at lower of cost or fair value 0 0
Residential loans, at lower of cost or fair value | Level 2    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Loans, at lower of cost or fair value 0 0
Residential loans, at lower of cost or fair value | Level 3    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Loans, at lower of cost or fair value 866 866
REO    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
REO 1,725 1,725
Gain (loss) on assets measured at fair value on a non-recurring basis 0 (81)
REO | Level 1    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
REO 0 0
REO | Level 2    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
REO 0 0
REO | Level 3    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
REO $ 1,725 $ 1,725