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Fair Value of Financial Instruments (Fair Value Methodology) (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value $ 1,200,707   $ 1,381,113
Purchases excluded from level 2 fair value 274   470
Discounted cash flow      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value 677,172   829,842
Liquidation model      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value 523,535   551,271
Simple average amount $ 375   $ 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 (4.00%) 2.40%  
Liquidation timeline (in years) 9 months 18 days 1 month 6 days  
Current value of underlying properties $ 5 $ 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 6.90% 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 0.042   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 0.047   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 0.066   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 0.000   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 0.080   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 0.038   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 0.20%   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 0.341   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 0.055   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) 2 years   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 0.128   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 $ 698   $ 684