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Fair Value of Financial Instruments (Fair Value Methodology) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 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 $ 1,381,113 $ 1,383,502
Loan purchases excluded from Level 3 fair value methodology disclosures 470 282,500
Discounted cash flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 829,842 700,250
Liquidation model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 551,271 683,252
Residential loans, simple average, amount $ 365 $ 400
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 8.00% 12.20%
Liquidation timeline (in years) 4 years 6 months 4 years 6 months
Current value of underlying properties $ 4,500 $ 7,950
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 2.40% (0.50%)
Liquidation timeline (in years) 1 month 6 days 1 month 6 days
Current value of underlying properties $ 10 $ 2
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 | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.038 0.045
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 0.042 0.052
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 | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.062 0.061
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 | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.180 0.159
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 0.007 0.009
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 0.045 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 | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.230 0.241
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 | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.040 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 | 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 | 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 | 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 $ 684 $ 802