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Multi-family Loans, at Fair Value - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]      
Loan premiums and early redemption $ 390 $ 3,950 $ 5,294
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Unrealized gains (losses), net 1,100 (2,700) 1,000
Loan premiums and early redemption $ 200 $ 1,000 $ 2,500