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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Investment Holdings [Line Items]
Available-for-sale	$ 150,498		$ 150,498		$ 206,792
Fair value of securities acquired	0	$ 522	10,000	$ 1,600
Fair value of securities sold	0	2,585	0	4,785
Principal balance of securities called	0	1,307	14,486	1,507
Net unrealized (loss) gain on available-for-sale securities	(33,409)	$ 11,224	(51,282)	$ 22,210
Sequoia securities
Investment Holdings [Line Items]
Available-for-sale	85,269		85,269		127,542
Consolidated Agency multifamily loans, at fair value
Investment Holdings [Line Items]
Available-for-sale	13,169		13,169		22,166
Other third-party residential securities
Investment Holdings [Line Items]
Available-for-sale	52,060		52,060		57,084
Total Subordinate Investment Securities
Investment Holdings [Line Items]
Available-for-sale	$ 150,498		$ 150,498		$ 206,792

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