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Fair Value of Financial Instruments - Fair Value Methodology for Level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Unobservable Input    
Residential whole loans, at fair value $ 769,301 $ 505,723
Loans which management considers the purchase price continues to reflect the fair value 45,400 117,600
Discounted cash flow    
Unobservable Input    
Residential whole loans, at fair value 253,287 113,166
Liquidation model    
Unobservable Input    
Residential whole loans, at fair value 516,014 392,557
Residential loans, simple average, amount $ 320 $ 305
Residential whole loans | Level 3 | Discounted cash flow | Minimum    
Unobservable Input    
Discount rate 5.00% 6.00%
Prepayment rate 0.00% 0.30%
Default rate 0.00% 0.00%
Loss severity 0.00% 10.00%
Residential whole loans | Level 3 | Discounted cash flow | Maximum    
Unobservable Input    
Discount rate 7.70% 8.70%
Prepayment rate 12.00% 11.10%
Default rate 9.70% 9.10%
Loss severity 77.50% 79.40%
Residential whole loans | Level 3 | Discounted cash flow | Weighted Average    
Unobservable Input    
Discount rate 6.60% 7.00%
Prepayment rate 7.60% 6.60%
Default rate 2.90% 3.10%
Loss severity 13.00% 17.03%
Residential whole loans | Level 3 | Liquidation model | Minimum    
Unobservable Input    
Discount rate 6.80% 6.80%
Annual change in home prices (9.20%) (5.50%)
Liquidation timeline 1 month 6 days 8 months 12 days
Current value of underlying properties $ 5 $ 14
Residential whole loans | Level 3 | Liquidation model | Maximum    
Unobservable Input    
Discount rate 26.90% 10.00%
Annual change in home prices 7.70% 6.10%
Liquidation timeline 4 years 4 months 24 days 4 years 4 months 24 days
Current value of underlying properties $ 4,900 $ 3,500
Residential whole loans | Level 3 | Liquidation model | Weighted Average    
Unobservable Input    
Discount rate 7.70% 6.90%
Annual change in home prices 1.70% 1.30%
Liquidation timeline 1 year 7 months 6 days 1 year 7 months 6 days
Current value of underlying properties $ 634 $ 626