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Real Estate Securities - Additional Information (Details) $ in Thousands | Dec. 31, 2020 USD ($) investment | Dec. 31, 2019 USD ($) investment
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Investment Holdings [Line Items] |  |
Number of AFS securities | investment | 96 | 107
Number of securities in unrealized loss position | investment | 5 | 1
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | investment | 0 | 1
Gross unrealized losses | $ 1,047 | $ 29
AFS securities, allowance for credit loss | 388 | $ 0
Residential |  |
Investment Holdings [Line Items] |  |
Marketable securities, less than five years | 41,000 |
Marketable securities, due from five to ten years | $ 3,000 |

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