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Real Estate Securities - Trading Securities by Collateral Type (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Investment Holdings [Line Items] |  |
Real estate securities | $ 170,619 | $ 125,667
Unpaid principal balance | 235,306 | 245,855
Principal balance of securities acquired (1) | 50,180 | 79,921
Principal balance of securities sold (1) | 55,561 | 744,914
Net market valuation gains (losses) recorded | 23,583 | (230,731)
Securities bought and sold during the same quarter | 5,000 | 11,000
Senior IO Securities |  |
Investment Holdings [Line Items] |  |
Real estate securities | 21,787 | 28,464
Unpaid principal balance | 0 | 0
Mezzanine |  |
Investment Holdings [Line Items] |  |
Real estate securities | 0 | 3,649
Unpaid principal balance | 0 | 3,577
Subordinate |  |
Investment Holdings [Line Items] |  |
Real estate securities | 148,832 | 93,554
Unpaid principal balance | 235,306 | 242,278
Interest-only securities | Senior IO Securities |  |
Investment Holdings [Line Items] |  |
Real estate securities | 21,787 | 28,464
Interest-only securities | Senior IO Securities | Sequoia |  |
Investment Holdings [Line Items] |  |
Real estate securities | 15,000 | 13,000
Sequoia securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Real estate securities | 0 | 3,649
RPL securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Real estate securities | 65,140 | 47,448
Multifamily securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Real estate securities | 10,549 | 5,592
Other third-party residential securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Real estate securities | $ 73,143 | $ 40,514

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