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Fair Value of Financial Instruments-Fair Value Methodology (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Residential whole loans, at fair value, excluding unsettled loan purchases $ 170,933
Residential whole loans, at fair value, unsettled loan purchases 360,600
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 65,176
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 $ 105,757
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) 6.00%
Prepayment rate (percent) 0.25%
Default rate (percent) 0.00%
Loss severity (percent) 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) 7.83%
Prepayment rate (percent) 10.60%
Default rate (percent) 8.80%
Loss severity (percent) 75.62%
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) 6.85%
Prepayment rate (percent) 6.62%
Default rate (percent) 3.23%
Loss severity (percent) 19.02%
Residential whole loans | Level 3 | Liquidation model | Minimum  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Discount rate (percent) 6.75%
Annual change in home prices (percent) (6.75%)
Liquidation timeline (in years) 11 months 1 day
Current value of underlying properties $ 29
Residential whole loans | Level 3 | Liquidation model | Maximum  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Discount rate (percent) 9.56%
Annual change in home prices (percent) 4.94%
Liquidation timeline (in years) 4 years 8 months 1 day
Current value of underlying properties $ 3,440
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) 7.13%
Annual change in home prices (percent) 1.56%
Liquidation timeline (in years) 1 year 10 months 10 days
Current value of underlying properties $ 475