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Real Estate Securities - Trading Securities by Collateral Type (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Investment Holdings [Line Items] |  |  |
Real estate securities, at fair value | $ 108,366 |  | $ 108,329
Unpaid principal balance | 211,496 |  | 215,592
Fair value of securities acquired | 1,700 | $ 5,006 |
Fair value of securities sold | 3,509 | 0 |
Net market valuation gains (losses) recorded | 1,961 | $ (1,456) |
Senior Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Real estate securities, at fair value | 31,297 |  | 28,867
Unpaid principal balance | 0 |  | 0
Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Real estate securities, at fair value | 77,069 |  | 79,462
Unpaid principal balance | 211,496 |  | 215,592
Interest Only Senior Trading Securities | Senior Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Real estate securities, at fair value | 31,297 |  | 28,867
Interest Only Senior Trading Securities | Senior Securities [Member] | Sequoia |  |  |
Investment Holdings [Line Items] |  |  |
Real estate securities, at fair value | 26,000 |  | 26,000
RPL securities | Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Real estate securities, at fair value | 28,689 |  | 29,002
Consolidated Agency multifamily loans, at fair value | Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Real estate securities, at fair value | 4,979 |  | 5,027
Other third-party residential securities | Subordinate |  |  |
Investment Holdings [Line Items] |  |  |
Real estate securities, at fair value | $ 43,401 |  | $ 45,433

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