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Fair Value of Financial Instruments (Fair Value Methodology) (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value $ 1,452,536 $ 1,383,502
Purchases excluded from level 2 fair value 633 282,500
Discounted cash flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 797,467 700,250
Liquidation model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 655,069 683,252
Simple average amount $ 357 $ 400
Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Annual change in home prices 2.50% (0.50%)
Liquidation timeline (in years) 1 month 6 days 1 month 6 days
Current value of underlying properties $ 4 $ 2
Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Annual change in home prices 7.30% 12.20%
Liquidation timeline (in years) 4 years 6 months 4 years 6 months
Current value of underlying properties $ 4,500 $ 7,950
Discount rate | 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]    
Measurement input 0.040 0.045
Discount rate | 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]    
Measurement input 0.080 0.080
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.046 0.052
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.060 0.061
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.500 0.500
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.080 0.080
Prepayment rate | 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]    
Measurement input 0.002 0.0090
Prepayment rate | 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]    
Measurement input 0.178 0.159
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.048 0.048
Prepayment rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Annual change in home prices 3.70% 3.50%
Default rate | 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]    
Measurement input 0.000 0.000
Default rate | 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]    
Measurement input 0.245 0.241
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.042 0.041
Default rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liquidation timeline (in years) 1 year 9 months 18 days 1 year 9 months 18 days
Loss severity | 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]    
Measurement input 0.000 0.000
Loss severity | 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]    
Measurement input 1.000 1.000
Loss severity | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.129 0.129
Loss severity | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current value of underlying properties $ 688 $ 802