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Real Estate Securities - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) investment Investment | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) investment
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of AFS securities (in investments) | investment | 69 |  | 66
Number of securities in unrealized loss position | investment | 13 |  | 21
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | 12 |  | 19
Gross unrealized losses | $ 4,880,000 |  | $ 6,753,000
CECL credit allowance | 1,853,000 |  | 2,482,000
Sales |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Gross realized gains | 0 | $ 1,000,000 |
Residential |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
AFS securities, contractual maturities, less than five years | 4,000,000 |  |
Marketable securities, due from five to ten years | 7,000,000 |  |
CECL credit allowance | $ 19,717,000 |  | $ 23,436,000

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