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Multi-family Loans, at Fair Value - Preferred Equity and Mezzanine Loan Investments (Details) - Preferred Equity and Mezzanine Loan Investments - VIE, Not Primary Beneficiary - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Investment amount | $ 98,246 | $ 88,249
Deferred loan fees, net | (473) | (428)
Unrealized gains (losses), net | 662 | (287)
Total, at Fair Value | $ 98,435 | $ 87,534

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