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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Investment Holdings [Line Items] |  |
Debt securities, available for sale | $ 218,458 | $ 239,334
AFS securities acquired | 57,652 | 26,538
AFS securities sold | 55,192 | 110,070
Gross realized gains | 4,635 | 17,582
Senior IO Securities |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 0 | 25,792
Mezzanine |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 2,014 | 13,687
Subordinate |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 216,444 | 199,855
Other third-party residential securities | Senior IO Securities |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 0 | 25,792
Other third-party residential securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 2,014 | 4,244
Other third-party residential securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 36,306 | 59,776
Sequoia securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 0 | 4,320
Sequoia securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 136,475 | 136,330
Multifamily securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | 0 | 5,123
Multifamily securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Debt securities, available for sale | $ 43,663 | $ 3,749

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