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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	$ 97,496		$ 97,496		$ 132,146
Fair value of securities acquired	1,979	$ 0	1,979	$ 10,000
Fair value of securities sold	40,574	0	43,252	0
Principal balance of securities called	0	0	0	14,486
Net unrealized (loss) gain on available-for-sale securities	(688)	$ (33,409)	4,319	$ (51,282)
Sequoia securities
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	77,047		77,047		74,367
Consolidated Agency multifamily loans, at fair value
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	7,749		7,749		7,647
Other third-party residential securities
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	12,700		12,700		50,132
Total Subordinate Investment Securities
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale	$ 97,496		$ 97,496		$ 132,146

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