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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 - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
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 $ 854 $ 867
Gain (loss) on assets measured at fair value on a non-recurring basis 22 (17)
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 854 867
REO    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
REO 2,034 5,207
Gain (loss) on assets measured at fair value on a non-recurring basis (393) (1,831)
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 $ 2,034 5,207
Commercial 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   2,700
Gain (loss) on assets measured at fair value on a non-recurring basis   (300)
Commercial 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
Commercial 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
Commercial 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   $ 2,700