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Real Estate Securities - Additional Information (Details) $ in Thousands | Sep. 30, 2023 USD ($) numberOfInvestment | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) numberOfInvestment
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Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of AFS securities (in investments) | numberOfInvestment | 66 |  | 79
Number of securities in unrealized loss position | numberOfInvestment | 29 |  | 38
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | numberOfInvestment | 23 |  | 1
Gross unrealized losses | $ 8,984 |  | $ 13,127
CECL credit allowance | 2,573 | $ 2,639 | 2,540
Residential |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
AFS securities, contractual maturities, less than five years | 4,000 |  |
Marketable securities, due from five to ten years | 4,000 |  |
CECL credit allowance | $ 23,890 | $ 25,615 | $ 28,739

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