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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, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Fair Value	$ 4,753	$ 4,523
Unpaid Principal Balance	$ 3,363	$ 3,363

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