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Fair Value of Financial Instruments-Fair Value Methodology (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value $ 183,861 $ 143,472
Residential whole loans, at fair value excluding unsettled loan purchases 137,393  
Discounted cash flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 57,620  
Liquidation model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value $ 79,773  
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) 7.50%  
Prepayment rate (percent) 10.20%  
Default rate (percent) 8.40%  
Loss severity (percent) 76.99%  
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) 6.22%  
Default rate (percent) 3.08%  
Loss severity (percent) 19.79%  
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) (3.58%)  
Liquidation timeline (in years) 1 year  
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) 6.75%  
Annual change in home prices (percent) 6.67%  
Liquidation timeline (in years) 4 years 2 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) 6.75%  
Annual change in home prices (percent) 0.62%  
Liquidation timeline (in years) 1 year 252 days  
Current value of underlying properties $ 452