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Real Estate Securities - Schedule of Carrying Value of AFS Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Investments, Debt and Equity Securities [Abstract] |  |  |
Principal balance | $ 149,956 | $ 221,933 |
Credit reserve | (23,436) | (28,739) |
Unamortized discount, net | (46,885) | (61,650) |
Amortized cost | 79,635 | 131,544 |
Gross unrealized gains | 16,973 | 16,269 |
Gross unrealized losses | (6,753) | (13,127) |
CECL allowance | (2,482) | (2,540) | $ 0
Carrying Value | $ 87,373 | $ 132,146 |

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