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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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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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