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Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Investments, Debt and Equity Securities [Abstract] |  |  |
Principal balance | $ 227,715 |  | $ 242,852
Credit reserve | (30,247) |  | (27,555)
Unamortized discount, net | (61,015) |  | (76,023)
Amortized cost | 136,453 |  | 139,274
Gross unrealized gains | 19,017 |  | 67,815
Gross unrealized losses | (10,876) |  | (297)
CECL allowance | (2,315) | $ (1,771) | 0
Carrying Value | $ 142,279 |  | $ 206,792

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