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v3.23.3

Other Investments - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) numberOfInvestment Investment | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) numberOfInvestment partnership Investment | Sep. 30, 2022 USD ($) | Dec. 31, 2018 partnership | Dec. 31, 2022 USD ($)
Net Investment Income [Line Items] |  |  |  |  |  |
Number of partnerships consolidated | partnership |  |  | 2 |  | 2 |
Collateral amounts | $ 1,775,977,000 |  | $ 1,775,977,000 |  |  | $ 1,379,856,000
Investment fair value changes, net | (31,430,000) | $ (57,697,000) | (36,153,000) | $ (151,789,000) |  |
Investments | 6,000,000 |  | 6,000,000 |  |  |
Other income, net | 2,346,000 | 4,027,000 | 11,060,000 | 17,016,000 |  |
Interest income | 177,074,000 | 177,662,000 | 534,571,000 | 534,517,000 |  |
MSR income, net | 1,747,000 | 2,890,000 | 6,173,000 | 12,569,000 |  |
Strategic investments |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Investment fair value changes, net | 100,000 | 1,000,000 | (3,000,000) | 11,000,000 |  |
Other income, net | $ (2,000,000) | $ (300,000) | $ (3,000,000) | $ (400,000) |  |
Strategic investments | RWT Horizons |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Number of investments made | Investment | 35 |  | 35 |  |  |
Investments | $ 23,000,000 |  | $ 23,000,000 |  |  |
Strategic investments | Churchill Finance |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Number of investments made | numberOfInvestment | 7,000 |  | 7,000 |  |  |
Strategic investments | BPL Bridge Loans |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Investments | $ 1,600,000 |  | $ 1,600,000 |  |  |
Sale of investments | $ 29,000,000 |  |  |  |  |
Equity method investment, ownership percentage | 20.00% |  | 20.00% |  |  |
MSRs |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Mortgage servicing rights | $ 26,033,000 |  | $ 26,033,000 |  |  | 25,421,000
Aggregate principal balance | 2,070,000,000.00 |  | 2,070,000,000.00 |  |  | 2,190,000,000
MSR income, net | 2,000,000 |  | 6,000,000 |  |  |
Servicer advance financing |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Collateral amounts | 185,000,000 |  | 185,000,000 |  |  |
Income (loss) from equity method investments | 5,000,000 |  | 16,000,000 |  |  |
Investment fair value changes, net | 4,000,000 |  | 6,000,000 |  |  |
Held-for-sale residential loans |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Mortgage servicing rights | 219,813,000 |  | 219,813,000 |  |  | 269,259,000
Servicing asset, unpaid principal balance on underlying loan | 10,450,000,000 |  | 10,450,000,000 |  |  |
Excess MSRs |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Mortgage servicing rights | 38,427,000 |  | 38,427,000 |  |  | $ 39,035,000
Investment fair value changes, net | (1,000,000) |  | (1,000,000) |  |  |
Interest income | 3,000,000 |  | 11,000,000 |  |  |
Fair value option elected aggregate carrying amount, asset | $ 0 |  | $ 0 |  |  |

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