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Real Estate Securities - Additional Information (Details) $ in Thousands | Dec. 31, 2021 USD ($) investment | Dec. 31, 2020 USD ($) investment | Dec. 31, 2019 USD ($)
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Investment Holdings [Line Items] |  |  |
Number of AFS securities | investment | 85 | 96 |
Number of securities in unrealized loss position | investment | 4 | 5 |
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | investment | 1 | 0 |
Gross unrealized losses | $ 297 | $ 1,047 |
AFS securities, allowance for credit loss | 0 | $ 388 | $ 0
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Marketable securities, less than five years | 19,000 |  |
Marketable securities, due from five to ten years | $ 4,000 |  |

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