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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Investment Holdings [Line Items]
Available-for-sale	$ 212,461		$ 212,461		$ 218,458
Fair value of securities acquired	522	$ 0	1,600	$ 31,181
Fair value of securities sold	2,585	8,736	4,785	55,193
Net realized gains recorded	1,307	$ 783	1,507	$ 4,635
Mezzanine
Investment Holdings [Line Items]
Available-for-sale	0		0		2,014
Subordinate
Investment Holdings [Line Items]
Available-for-sale	212,461		212,461		216,444
Other third-party residential securities | Mezzanine
Investment Holdings [Line Items]
Available-for-sale	0		0		2,014
Other third-party residential securities | Subordinate
Investment Holdings [Line Items]
Available-for-sale	37,927		37,927		36,306
Sequoia securities | Subordinate
Investment Holdings [Line Items]
Available-for-sale	140,321		140,321		136,475
Multifamily loans, held-for-investment, at fair value | Subordinate
Investment Holdings [Line Items]
Available-for-sale	$ 34,213		$ 34,213		$ 43,663

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