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Real Estate Securities - Additional Information (Details) $ in Thousands | Mar. 31, 2023 USD ($) investment | Dec. 31, 2022 USD ($) investment
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Investment Holdings [Line Items] |  |
Number of AFS securities (in investments) | investment | 78 | 79
Number of securities in unrealized loss position | investment | 37 | 38
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | investment | 6 | 1
Gross unrealized losses | $ 10,742 | $ 13,127
CECL credit allowance | 2,568 | 2,540
Residential |  |
Investment Holdings [Line Items] |  |
AFS securities, contractual maturities, less than five years | 4,000 |
Marketable securities, due from five to ten years | 1,000 |
CECL credit allowance | $ 28,208 | $ 28,739

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