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Fair Value of Financial Instruments (Fair Value Methodology) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value $ 1,207,731   $ 1,216,637
Purchases excluded from level 2 fair value 112,500   265
Discounted cash flow      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value 798,185   789,576
Liquidation model      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Residential whole loans, at fair value 409,546   427,061
Simple average amount $ 403   $ 380
Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value Inputs, Annual Change in Home Prices 4.20%   0.00%
Liquidation timeline (in years) 8 months 12 days   9 months 18 days
Fair Value Inputs, Value of Underlying Property $ 5   $ 12
Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value Inputs, Annual Change in Home Prices 10.40%   6.50%
Liquidation timeline (in years) 4 years 9 months 18 days   4 years 9 months 18 days
Fair Value Inputs, Value of Underlying Property $ 3,704   $ 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   0.033
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 0.038   0.039
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   0.067
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   0.081
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   0.000
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 0.089   0.099
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 0.042   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]      
Fair Value Inputs, Annual Change in Home Prices 6.20% 3.60%  
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 0.179   0.189
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 0.034   0.038
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 0.121   0.127
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]      
Fair Value Inputs, Value of Underlying Property $ 744 $ 729