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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | $ 200,276 |  | $ 200,276 |  | $ 218,458
Fair value of securities acquired | 0 | $ 25,483 | 1,600 | $ 56,664 |
Fair value of securities sold | 0 | $ 0 | 4,785 | $ 55,193 |
Mezzanine |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 0 |  | 0 |  | 2,014
Subordinate |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 200,276 |  | 200,276 |  | 216,444
Other third-party residential securities | Mezzanine |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 0 |  | 0 |  | 2,014
Other third-party residential securities | Subordinate |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 40,082 |  | 40,082 |  | 36,306
Sequoia securities | Subordinate |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | 128,874 |  | 128,874 |  | 136,475
Multifamily loans, held-for-investment, at fair value | Subordinate |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Available-for-sale | $ 31,320 |  | $ 31,320 |  | $ 43,663

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