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Fair Value of Financial Instruments - Fair Value Methodology (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchased Loans | $ 1,071,774 | $ 1,216,637
Purchases excluded from level 2 fair value | 496 | 265
Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchased Loans | 3,151,876 |
Discounted cash flow | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchased Loans | 720,766 | 789,576
Discounted cash flow | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchased Loans | 3,143,928 |
Liquidation model | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchased Loans | 351,008 | 427,061
Simple average amount | 421 | $ 380
Liquidation model | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchased Loans | $ 7,948 |
Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Annual Change in Home Prices | 4.50% | 0.00%
Liquidation timeline (in years) | 1 month 6 days | 9 months 18 days
Fair Value Inputs, Value of Underlying Property | $ 10 | $ 12
Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Annual Change in Home Prices | 0.00% |
Liquidation timeline (in years) | 9 months 18 days |
Fair Value Inputs, Value of Underlying Property | $ 60 |
Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Annual Change in Home Prices | 21.90% | 6.50%
Liquidation timeline (in years) | 4 years 6 months | 4 years 9 months 18 days
Fair Value Inputs, Value of Underlying Property | $ 3,995 | $ 4,500
Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Annual Change in Home Prices | 14.80% |
Liquidation timeline (in years) | 4 years 2 months 12 days |
Fair Value Inputs, Value of Underlying Property | $ 1,750 |
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.015 | 0.033
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.014 |
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.098 | 0.080
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.259 |
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.036 | 0.039
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.039 |
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum | Nonperforming Financial Instruments |  |
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 | Minimum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.070 |
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum | Nonperforming Financial Instruments |  |
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 | Maximum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.070 |
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.080 | 0.081
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.070 |
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.000 | 0.000
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.000 |
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.440 | 0.099
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.472 |
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.144 | 0.048
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.190 |
Prepayment rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Annual Change in Home Prices | 9.70% | 3.60%
Prepayment rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Annual Change in Home Prices | 6.50% |
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum | Nonperforming Financial Instruments |  |
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 | Minimum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.000 |
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.508 | 0.189
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.178 |
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.039 | 0.038
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.002 |
Default rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liquidation timeline (in years) | 1 year 8 months 12 days | 1 year 9 months 18 days
Default rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liquidation timeline (in years) | 2 years |
Loss severity | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum | Nonperforming Financial Instruments |  |
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 | Minimum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.000 |
Loss severity | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum | Nonperforming Financial Instruments |  |
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 | Maximum | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.100 |
Loss severity | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.117 | 0.127
Loss severity | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input | 0.084 |
Loss severity | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average | Nonperforming Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Value of Underlying Property | $ 770 | $ 729
Loss severity | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average | Performing Financial Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Value of Underlying Property | $ 691 |

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