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Investment Securities Available For Sale, at Fair Value - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued interest | $ 11,000,000 |  | $ 9,800,000
Unrealized (loss) gains on investment securities available for sale | $ (33,200,000) | $ 900,000 |
Contractual maturities (up to) | 39 years |  |
Weighted average life of available for sale securities portfolio | 6 years |  | 6 years 10 months 24 days
Non Agency RMBS Held In Securitization Trust | Non-Agency RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Realized loss on write-downs | $ (400,000) | $ 0 |

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