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Fair Value of Financial Instruments - Fair Value Methodology (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Residential Whole Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, fair value	$ 103,700
Nonperforming
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased performing loans, fair value	704,852	$ 795,894
Purchases excluded from level 2 fair value	572	215
Nonperforming | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased performing loans, fair value	$ 537,528	$ 546,675
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Discount rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.068	0.070
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Discount rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.062	0.063
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Discount rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.102	0.100
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Prepayment rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.097	0.089
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Prepayment rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.000	0.000
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Prepayment rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.389	0.335
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Default rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.021	0.037
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Default rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.000	0.000
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Default rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.395	0.524
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Loss severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.097	0.113
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Loss severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.000	0.000
Nonperforming | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Loss severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	1.000	1.000
Nonperforming | Liquidation model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased performing loans, fair value	$ 167,324	$ 249,219
Simple average amount	$ 494	$ 457
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Discount rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.080	0.078
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Discount rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.080	0.078
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Discount rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.080	0.078
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Annual change in home prices | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Annual change in home prices	4.60%	6.90%
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Annual change in home prices | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Annual change in home prices	(0.40%)	(5.40%)
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Annual change in home prices | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Annual change in home prices	12.70%	59.70%
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Liquidation timeline (in years) | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidation timeline (in years)	2 years 1 month 6 days	1 year 10 months 24 days
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Liquidation timeline (in years) | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidation timeline (in years)	1 month 6 days	1 month 6 days
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Liquidation timeline (in years) | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidation timeline (in years)	4 years 6 months	4 years 6 months
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Current value of underlying properties | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current value of underlying properties	$ 831	$ 743
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Current value of underlying properties | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current value of underlying properties	24	28
Nonperforming | Liquidation model | Residential whole loans, at fair value | Level 3 | Current value of underlying properties | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current value of underlying properties	4,720	4,000
Performing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased performing loans, fair value	6,646,651	4,880,321
Performing | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased performing loans, fair value	$ 6,522,457	$ 4,857,587
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Discount rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.080	0.076
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Discount rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.065	0.056
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Discount rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.292	0.227
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Prepayment rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.101	0.079
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Prepayment rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.000	0.000
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Prepayment rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.464	0.448
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Default rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.005	0.008
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Default rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.000	0.000
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Default rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.273	0.194
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Loss severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.109	0.073
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Loss severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.000	0.000
Performing | Discounted cash flow | Residential whole loans, at fair value | Level 3 | Loss severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.990	1.000
Performing | Liquidation model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchased performing loans, fair value	$ 124,194	$ 22,734
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Discount rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.080	0.078
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Discount rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.080	0.078
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Discount rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.080	0.078
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Annual change in home prices | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Annual change in home prices	2.60%	3.20%
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Annual change in home prices | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Annual change in home prices	0.00%	(1.00%)
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Annual change in home prices | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Annual change in home prices	10.10%	10.70%
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Liquidation timeline (in years) | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidation timeline (in years)	1 year 7 months 6 days	1 year 10 months 24 days
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Liquidation timeline (in years) | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidation timeline (in years)	9 months 18 days	9 months 18 days
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Liquidation timeline (in years) | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidation timeline (in years)	3 years 10 months 24 days	4 years 2 months 12 days
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Current value of underlying properties | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current value of underlying properties	$ 1,580	$ 1,319
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Current value of underlying properties | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current value of underlying properties	35	50
Performing | Liquidation model | Residential whole loans, at fair value | Level 3 | Current value of underlying properties | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current value of underlying properties	$ 5,500	$ 2,850

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