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Fair Value of Financial Instruments (Fair Value Methodology) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value $ 1,216,637 $ 1,381,113
Purchases excluded 265 470
Discounted cash flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 789,576 829,842
Liquidation model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value 427,061 551,271
Simple average amount $ 380 $ 365
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 0.00% 2.40%
Liquidation timeline (in years) 9 months 18 days 1 month 6 days
Current value of underlying properties $ 12 $ 10
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 6.50% 8.00%
Liquidation timeline (in years) 4 years 9 months 18 days 4 years 6 months
Current value of underlying properties $ 4,500 $ 4,500
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 0.033 0.038
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 0.039 0.042
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 0.067 0.062
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 0.081 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 0.000 0.007
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 0.099 0.180
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 0.045
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 3.60% 3.70%
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 0.189 0.230
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 0.038 0.04
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 0.127 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 $ 729 $ 684