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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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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