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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	$ 81,404		$ 81,404		$ 132,146
Fair value of securities acquired	0	$ 0	1,979	$ 10,000
Fair value of securities sold	12,590	0	55,842	0
Principal balance of securities called	0	0	0	14,486
Net unrealized gains (losses) on AFS securities	(3,921)	$ (8,731)	398	$ (60,013)
Sequoia securities
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	73,160		73,160		74,367
Consolidated Agency multifamily loans, at fair value
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	4,448		4,448		7,647
Other third-party residential securities
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	3,796		3,796		50,132
Total Subordinate Investment Securities
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	$ 81,404		$ 81,404		$ 132,146

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