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Other Investments - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) partnership numberOfInvestment Investment | Mar. 31, 2023 USD ($) | Dec. 31, 2018 partnership | Dec. 31, 2023 USD ($)
Net Investment Income [Line Items] |  |  |  |
Number of partnerships consolidated | partnership | 2 |  | 2 |
Total Collateral for Long-Term Debt | $ 1,550,658 |  |  | $ 1,565,514
(Decrease) increase in allowance for credit losses on AFS securities | 21,837 | $ (4,392) |  |
Principal payments on real estate securities | 294 | 255 |  |
Interest income | 204,740 | 178,516 |  |
MSR income, net | 4,225 | $ 1,077 |  |
Strategic investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
(Decrease) increase in allowance for credit losses on AFS securities | $ 1,000 |  |  |
Number of investments made | numberOfInvestment | 7,000 |  |  |
MSRs |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Mortgage servicing rights | $ 27,417 |  |  | 24,877
Aggregate principal balance | 2,000,000 |  |  | 2,190,000
MSR income, net | $ 4,000 |  |  |
RWT Horizons | Strategic investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Number of investments made | Investment | 36 |  |  |
Investments | $ 22,000 |  |  |
Oaktree Capital Management, L.P. | Strategic investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investments | 5,000 |  |  |
Sale of investments | $ 52,000 |  |  |
Equity method investment, ownership percentage | 20.00% |  |  |
Servicer advance financing |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total Collateral for Long-Term Debt | $ 176,000 |  |  |
Repayments received | 9,000 |  |  |
Income (loss) from equity method investments | 5,000 |  |  |
(Decrease) increase in allowance for credit losses on AFS securities | (1,000) |  |  |
Held-for-sale residential loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Mortgage servicing rights | 216,033 |  |  | 225,345
Servicing asset, unpaid principal balance on underlying loan | 9,920,000 |  |  |
Excess MSRs |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Mortgage servicing rights | 36,122 |  |  | $ 37,367
(Decrease) increase in allowance for credit losses on AFS securities | (1,000) |  |  |
Interest income | 3,000 |  |  |
Fair value option elected aggregate carrying amount, asset | 9,000 |  |  |
Construction Draws On Residential Investor Bridge Loans | Redwood |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Principal payments on real estate securities | $ 15,000 |  |  |

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