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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Investment Holdings [Line Items] |  |
Debt securities, available for sale | $ 206,792 | $ 218,458
AFS securities acquired | 19,100 | 57,652
AFS securities sold | 4,785 | 55,192
Principal balance of securities called | 27,875 | 7
Securities bought and sold | 6,000 | 500
Mezzanine |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 0 | 2,014
Subordinate |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 206,792 | 216,444
Other third-party residential securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 0 | 2,014
Other third-party residential securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 57,084 | 36,306
Sequoia securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 127,542 | 136,475
Multifamily securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | $ 22,166 | $ 43,663

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