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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Investment Holdings [Line Items]
Available-for-sale	$ 142,279		$ 142,279		$ 206,792
Fair value of securities acquired	0	$ 0	10,000	$ 1,600
Fair value of securities sold	0	0	0	4,785
Principal balance of securities called	0	11,565	14,486	25,970
Net unrealized (loss) gain on available-for-sale securities	(8,731)	$ (2,658)	(60,013)	$ 19,552
Sequoia securities
Investment Holdings [Line Items]
Available-for-sale	78,065		78,065		127,542
Consolidated Agency multifamily loans, at fair value
Investment Holdings [Line Items]
Available-for-sale	13,211		13,211		22,166
Other third-party residential securities
Investment Holdings [Line Items]
Available-for-sale	51,003		51,003		57,084
Total Subordinate Investment Securities
Investment Holdings [Line Items]
Available-for-sale	$ 142,279		$ 142,279		$ 206,792

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