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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | $ 142,279 |  | $ 142,279 |  | $ 206,792
Fair value of securities acquired | 0 | $ 0 | 10,000 | $ 1,600 |
Fair value of securities sold | 0 | 0 | 0 | 4,785 |
Principal balance of securities called | 0 | 11,565 | 14,486 | 25,970 |
Net unrealized (loss) gain on available-for-sale securities | (8,731) | $ (2,658) | (60,013) | $ 19,552 |
Sequoia securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 78,065 |  | 78,065 |  | 127,542
Consolidated Agency multifamily loans, at fair value |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 13,211 |  | 13,211 |  | 22,166
Other third-party residential securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 51,003 |  | 51,003 |  | 57,084
Total Subordinate Investment Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | $ 142,279 |  | $ 142,279 |  | $ 206,792

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