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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
Mar. 31, 2018
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 $ 251
Gain (loss) on assets measured at fair value on a non-recurring basis 1
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
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
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 251
REO  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]  
REO 2,034
Gain (loss) on assets measured at fair value on a non-recurring basis (146)
REO | Level 1  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]  
REO 0
REO | Level 2  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]  
REO 0
REO | Level 3  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]  
REO $ 2,034