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Real Estate Securities - Schedule of Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Subordinate securities, classified as AFS	$ 87,373	$ 132,146
Fair value of securities acquired	1,979	10,000
Fair value of securities sold	55,842	0
Principal balance of securities called	0	20,267
Net unrealized gain (loss) on available-for-sale securities	6,230	(64,704)	$ 8,016
Sequoia securities
Investment Holdings [Line Items]
Subordinate securities, classified as AFS	78,942	74,367
Multifamily securities
Investment Holdings [Line Items]
Subordinate securities, classified as AFS	4,460	7,647
Other third-party residential securities
Investment Holdings [Line Items]
Subordinate securities, classified as AFS	3,971	50,132
Total Subordinate
Investment Holdings [Line Items]
Subordinate securities, classified as AFS	$ 87,373	$ 132,146

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