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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | $ 205,361 | $ 87,373
Senior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 32,356 | 0
Mezzanine |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 35,059 | 0
Subordinate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 137,946 | 87,373
Other third-party securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 102,742 | 3,971
Other third-party securities | Senior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 32,356 | 0
Other third-party securities | Mezzanine |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 32,178 | 0
Other third-party securities | Subordinate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 38,208 | 3,971
Multifamily securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 7,385 | 4,460
Multifamily securities | Senior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 0 | 0
Multifamily securities | Mezzanine |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 2,881 | 0
Multifamily securities | Subordinate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 4,504 | 4,460
Sequoia securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 95,234 | 78,942
Sequoia securities | Senior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 0 | 0
Sequoia securities | Mezzanine |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | 0 | 0
Sequoia securities | Subordinate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale | $ 95,234 | $ 78,942

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