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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Investment Holdings [Line Items] |  |  |
Available-for-sale | $ 218,930 |  | $ 218,458
Fair value of securities acquired | 1,078 | $ 31,181 |
Fair value of securities sold | 2,200 | 46,457 |
Net realized gains recorded | 200 | $ 3,852 |
Mezzanine |  |  |
Investment Holdings [Line Items] |  |  |
Available-for-sale | 0 |  | 2,014
Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Available-for-sale | 218,930 |  | 216,444
Other third-party residential securities | Mezzanine |  |  |
Investment Holdings [Line Items] |  |  |
Available-for-sale | 0 |  | 2,014
Other third-party residential securities | Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Available-for-sale | 38,651 |  | 36,306
Sequoia securities | Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Available-for-sale | 141,632 |  | 136,475
Multifamily loans, held-for-investment, at fair value | Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Available-for-sale | $ 38,647 |  | $ 43,663

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