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Real Estate Securities - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($) investment entity	Sep. 30, 2021 USD ($) entity investment	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) investment
Investment Holdings [Line Items]
Number of AFS securities (in investments) | investment	84	84		96
Number of securities in unrealized loss position | investment	1	1		5
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | investment				0
Gross unrealized losses	$ 33	$ 33		$ 1,047
CECL credit allowance	$ 0	$ 0	$ 0	388
Variable Interest Entity, Not Primary Beneficiary
Investment Holdings [Line Items]
Number of entities called | entity	2	6
Unpaid principal balance of loans purchased	$ 66,000	$ 167,000
Gain related to called security	6,000	15,000
Residential
Investment Holdings [Line Items]
AFS securities, contractual maturities, less than five years	28,000	28,000
Marketable securities, due from five to ten years	4,000	4,000
CECL credit allowance	$ 29,448	$ 29,448	$ 40,349	$ 44,967

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