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Fair Value of Financial Instruments - Fair Value Methodology (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value $ 951,811 $ 769,301
Loan purchases excluded from Level 3 fair value methodology disclosures 373,300 45,400
Discounted cash flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 358,871 253,287
Liquidation model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 592,940 516,014
Residential loans, simple average, amount $ 336 $ 320
Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 13.00% 7.70%
Prepayment rate 15.10% 12.00%
Default rate 6.50% 9.70%
Loss severity 100.00% 77.50%
Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 4.50% 5.00%
Prepayment rate 1.15% 0.00%
Default rate 0.00% 0.00%
Loss severity 0.00% 0.00%
Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average (2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 5.50% 6.60%
Prepayment rate 4.10% 7.60%
Default rate 2.90% 2.90%
Loss severity 13.80% 13.00%
Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 50.00% 26.90%
Annual change in home prices 8.80% 7.70%
Liquidation timeline (in years) 4 years 6 months 4 years 4 months 24 days
Current value of underlying properties (3) $ 9,900 $ 4,900
Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 6.10% 6.80%
Annual change in home prices (8.00%) (9.20%)
Liquidation timeline (in years) 1 month 6 days 1 month 6 days
Current value of underlying properties (3) $ 0 $ 5
Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average (2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 8.00% 7.70%
Annual change in home prices 2.50% 1.70%
Liquidation timeline (in years) 1 year 7 months 6 days 1 year 7 months 6 days
Current value of underlying properties (3) $ 772 $ 634