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Real Estate Securities - Schedule of Fair Value of AFS Securities by Type (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | $ 284,372 | $ 211,474
Senior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 0 | 39,365
Mezzanine |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 0 | 31,867
Subordinate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 284,372 | 140,242
Other third-party securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 185,983 | 108,504
Other third-party securities | Senior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 0 | 39,365
Other third-party securities | Mezzanine |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 0 | 28,948
Other third-party securities | Subordinate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 185,983 | 40,191
Multifamily securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS |  | 11,749
Multifamily securities | Senior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS |  | 0
Multifamily securities | Mezzanine |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS |  | 2,919
Multifamily securities | Subordinate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS |  | 8,830
Sequoia securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 98,389 | 91,221
Sequoia securities | Senior |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 0 | 0
Sequoia securities | Mezzanine |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | 0 | 0
Sequoia securities | Subordinate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
AFS | $ 98,389 | $ 91,221

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