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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Investment Holdings [Line Items]
Available-for-sale	$ 200,276		$ 200,276		$ 218,458
Fair value of securities acquired	0	$ 25,483	1,600	$ 56,664
Fair value of securities sold	0	$ 0	4,785	$ 55,193
Mezzanine
Investment Holdings [Line Items]
Available-for-sale	0		0		2,014
Subordinate
Investment Holdings [Line Items]
Available-for-sale	200,276		200,276		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	40,082		40,082		36,306
Sequoia securities | Subordinate
Investment Holdings [Line Items]
Available-for-sale	128,874		128,874		136,475
Multifamily loans, held-for-investment, at fair value | Subordinate
Investment Holdings [Line Items]
Available-for-sale	$ 31,320		$ 31,320		$ 43,663

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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