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Fair Value of Financial Instruments (Fair Value Methodology) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential whole loans, at fair value   $ 1,229,187   $ 1,381,113
Purchases excluded from level 2 fair value   477   470
Discounted cash flow        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential whole loans, at fair value   774,427   829,842
Liquidation model        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential whole loans, at fair value   454,760   551,271
Simple average amount   $ 383   $ 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   (0.30%) 2.40%  
Liquidation timeline (in years)   1 month 6 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   5.50% 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   0.032   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   0.065
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   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   0.093   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   0.039   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 3.70% 1.90%    
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   0
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   0.303   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   0.062   0.040
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   0
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 $ 684 $ 734