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Real Estate Securities - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) entity investment	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) investment
Investment Holdings [Line Items]
Number of AFS securities (in investments) | investment	81		85
Number of securities in unrealized loss position | investment	35		4
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | investment	1		1
Gross unrealized losses	$ 10,876		$ 297
CECL credit allowance	$ 2,315	$ 1,771	0
Variable Interest Entity, Not Primary Beneficiary
Investment Holdings [Line Items]
Number of entities called | entity	3
Unpaid principal balance of loans purchased	$ 102,000
Realized gain on securities	300
Residential
Investment Holdings [Line Items]
AFS securities, contractual maturities, less than five years	10,000
Marketable securities, due from five to ten years	1,000
CECL credit allowance	$ 30,247	$ 30,619	$ 27,555

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