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Real Estate Securities - Additional Information (Details) $ in Thousands | Dec. 31, 2023 USD ($) Investment | Dec. 31, 2022 USD ($) Investment | Dec. 31, 2021 USD ($)
--- | --- | --- | ---
Investment Holdings [Line Items] |  |  |
Number of AFS securities | Investment | 66 | 79 |
Number of securities in unrealized loss position | Investment | 21 | 38 |
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | Investment | 19 | 1 |
Gross unrealized losses | $ 6,753 | $ 13,127 |
CECL credit allowance | 2,482 | $ 2,540 | $ 0
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Marketable securities, less than five years | 4,000 |  |
Marketable securities, due from five to ten years | $ 5,000 |  |

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