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Fair Value of Financial Instruments - Fair Value Methodology (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value, excluding unsettled loan purchases $ 601,148   $ 505,723
Residential whole loans, at fair value, excluded from Level 3 Fair Value Methodology Disclosures 46,200   117,600
Discounted cash flow      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value, excluding unsettled loan purchases 165,177   113,166
Liquidation model      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value, excluding unsettled loan purchases $ 435,971   $ 392,557
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%   6.00%
Prepayment rate (percent) 0.30%   0.30%
Default rate (percent) 0.00%   0.00%
Loss severity (percent) 0.00%   10.00%
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%   8.70%
Prepayment rate (percent) 11.50%   11.10%
Default rate (percent) 8.30%   9.10%
Loss severity (percent) 79.10%   79.40%
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) 6.50% 7.00%  
Prepayment rate (percent) 7.10% 6.60%  
Default rate (percent) 2.70% 3.10%  
Loss severity (percent) 13.80% 17.00%  
Residential Whole Loans | Level 3 | Liquidation model | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (percent) 6.80%   6.80%
Annual change in home prices (percent) (6.10%)   (5.50%)
Liquidation timeline (in years) 8 months 12 days   8 months 12 days
Current value of underlying properties $ 14   $ 14
Residential Whole Loans | Level 3 | Liquidation model | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (percent) 42.00%   10.00%
Annual change in home prices (percent) 5.80%   6.10%
Liquidation timeline (in years) 4 years 4 months 24 days   4 years 4 months 24 days
Current value of underlying properties $ 4,200   $ 3,500
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) 7.80% 6.90%  
Annual change in home prices (percent) 1.10% 1.30%  
Liquidation timeline (in years) 1 year 7 months 6 days 1 year 7 months 6 days  
Current value of underlying properties $ 623 $ 626