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Real Estate Securities - Additional Information (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
numberOfInvestment
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
numberOfInvestment
Debt and Equity Securities, FV-NI [Line Items]      
Number of AFS securities (in investments) | numberOfInvestment 66   79
Number of securities in unrealized loss position | numberOfInvestment 29   38
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | numberOfInvestment 23   1
Gross unrealized losses $ 8,984   $ 13,127
CECL credit allowance 2,573 $ 2,639 2,540
Residential      
Debt and Equity Securities, FV-NI [Line Items]      
AFS securities, contractual maturities, less than five years 4,000    
Marketable securities, due from five to ten years 4,000    
CECL credit allowance $ 23,890 $ 25,615 $ 28,739