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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | $ 150,498 |  | $ 150,498 |  | $ 206,792
Fair value of securities acquired | 0 | $ 522 | 10,000 | $ 1,600 |
Fair value of securities sold | 0 | 2,585 | 0 | 4,785 |
Principal balance of securities called | 0 | 1,307 | 14,486 | 1,507 |
Net unrealized (loss) gain on available-for-sale securities | (33,409) | $ 11,224 | (51,282) | $ 22,210 |
Sequoia securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 85,269 |  | 85,269 |  | 127,542
Consolidated Agency multifamily loans, at fair value |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 13,169 |  | 13,169 |  | 22,166
Other third-party residential securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 52,060 |  | 52,060 |  | 57,084
Total Subordinate Investment Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | $ 150,498 |  | $ 150,498 |  | $ 206,792

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