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Real Estate Securities - Additional Information (Details) $ in Thousands	Mar. 31, 2021 USD ($) investment	Dec. 31, 2020 USD ($) investment
Investment Holdings [Line Items]
Number of AFS securities (in investments) | investment	93	96
Number of securities in unrealized loss position | investment	4	5
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | investment	3	0
Gross unrealized losses	$ 252	$ 1,047
CECL credit allowance	13	388
Residential
Investment Holdings [Line Items]
AFS securities, contractual maturities, less than five years	35,000
Marketable securities, due from five to ten years	4,000
CECL credit allowance	$ 44,947	$ 44,967

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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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