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Fair Value of Financial Instruments - Fair Value Methodology (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value $ 775,152   $ 769,301
Loan purchases excluded from Level 3 fair value methodology disclosures 0   45,400
Discounted cash flow      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value 267,878   253,287
Liquidation model      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value 507,274   516,014
Residential loans, simple average, amount $ 340   $ 320
Residential whole loans | Level 3 | Discounted cash flow | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (percent) 5.00% 5.00%  
Prepayment rate (percent) 0.00% 0.00%  
Default rate (percent) 0.00% 0.00%  
Loss severity (percent) 0.00% 0.00%  
Residential whole loans | Level 3 | Discounted cash flow | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (percent) 7.70% 7.70%  
Prepayment rate (percent) 12.30% 12.00%  
Default rate (percent) 10.10% 9.70%  
Loss severity (percent) 100.00% 77.50%  
Residential whole loans | Level 3 | Discounted cash flow | Weighted Average      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (percent) 6.60%   6.60%
Prepayment rate (percent) 7.80%   7.60%
Default rate (percent) 3.20%   2.90%
Loss severity (percent) 12.80%   13.00%
Residential whole loans | Level 3 | Liquidation model | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (percent) 6.20% 6.80%  
Annual change in home prices (percent) (5.00%) (9.20%)  
Liquidation timeline (in years) 1 month 6 days 1 month 6 days  
Current value of underlying properties $ 15 $ 5  
Residential whole loans | Level 3 | Liquidation model | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (percent) 26.90% 26.90%  
Annual change in home prices (percent) 10.70% 7.70%  
Liquidation timeline (in years) 4 years 4 months 24 days 4 years 4 months 24 days  
Current value of underlying properties $ 4,900 $ 4,900  
Residential whole loans | Level 3 | Liquidation model | Weighted Average      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (percent) 7.70%   7.70%
Annual change in home prices (percent) 1.90%   1.70%
Liquidation timeline (in years) 1 year 6 months   1 year 7 months 6 days
Current value of underlying properties $ 641   $ 634