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Real Estate Securities - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) investment entity | Sep. 30, 2021 USD ($) entity investment | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) investment
Investment Holdings [Line Items] |  |  |  |
Number of AFS securities (in investments) | investment | 84 | 84 |  | 96
Number of securities in unrealized loss position | investment | 1 | 1 |  | 5
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | investment |  |  |  | 0
Gross unrealized losses | $ 33 | $ 33 |  | $ 1,047
CECL credit allowance | $ 0 | $ 0 | $ 0 | 388
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Number of entities called | entity | 2 | 6 |  |
Unpaid principal balance of loans purchased | $ 66,000 | $ 167,000 |  |
Gain related to called security | 6,000 | 15,000 |  |
Residential |  |  |  |
Investment Holdings [Line Items] |  |  |  |
AFS securities, contractual maturities, less than five years | 28,000 | 28,000 |  |
Marketable securities, due from five to ten years | 4,000 | 4,000 |  |
CECL credit allowance | $ 29,448 | $ 29,448 | $ 40,349 | $ 44,967

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