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Other Investments - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) Investment numberOfInvestment | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) partnership Investment numberOfInvestment | Jun. 30, 2023 USD ($) | Dec. 31, 2018 partnership | Dec. 31, 2023 USD ($)
Net Investment Income [Line Items] |  |  |  |  |  |
Number of partnerships consolidated | partnership |  |  | 2 |  | 2 |
Carrying Value of Collateral | $ 3,700,905 |  | $ 3,700,905 |  |  | $ 3,405,564
Investment fair value changes, net | 1,098 | $ (13,517) | 22,935 | $ (17,909) |  |
Interest income | 225,417 | $ 178,981 | 430,157 | $ 357,497 |  |
Strategic investments |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Investment fair value changes, net | $ (1,000) |  | $ (1,000) |  |  |
Number of investments made | numberOfInvestment | 8,000 |  | 8,000 |  |  |
Investments | $ 37,000 |  | $ 37,000 |  |  |
Sale of investments | 200 |  | 300 |  |  |
MSRs |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Mortgage servicing rights | 28,653 |  | 28,653 |  |  | 24,877
Aggregate principal balance | 1,950,000 |  | 1,950,000 |  |  | 2,030,000
MSR income, net | $ 4,000 |  | $ 8,000 |  |  |
RWT Horizons | Strategic investments |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Number of investments made | Investment | 39 |  | 39 |  |  |
Investments | $ 22,000 |  | $ 22,000 |  |  |
Oaktree Capital Management, L.P. | Strategic investments |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Investments | $ 6,000 |  | $ 6,000 |  |  |
Equity method investment, ownership percentage | 20.00% |  | 20.00% |  |  |
CPP Investments | Strategic investments |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Investments | $ 1,000 |  | $ 1,000 |  |  |
Equity method investment, ownership percentage | 20.00% |  | 20.00% |  |  |
Servicer advance financing |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Carrying Value of Collateral | $ 176,000 |  | $ 176,000 |  |  |
Repayments received | 9,000 |  | 9,000 |  |  |
Income (loss) from equity method investments | 5,000 |  | 10,000 |  |  |
Investment fair value changes, net | 12,000 |  | 11,000 |  |  |
Held-for-sale residential loans |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Mortgage servicing rights | 227,363 |  | 227,363 |  |  | 225,345
Servicing asset, unpaid principal balance on underlying loan | 9,640,000 |  | 9,640,000 |  |  |
Excess MSRs |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Mortgage servicing rights | 34,754 |  | 34,754 |  |  | $ 37,367
Investment fair value changes, net | (1,000) |  | (3,000) |  |  |
Interest income | 3,000 |  | 7,000 |  |  |
Fair value option elected aggregate carrying amount, asset | $ 1,000 |  | $ 10,000 |  |  |

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