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Multi-family Loans, at Fair Value - Unpaid Principal Balance (Details) - 90 Days or greater past due - Multi-family loans - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Fair Value $ 4,299 $ 3,972
Unpaid Principal Balance $ 3,363 $ 3,363