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Multi-family Loans, at Fair Value - Preferred Equity and Mezzanine Loan Investments (Details) - Preferred Equity and Mezzanine Loan Investments - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Investment amount | $ 108,852 | $ 118,307
Deferred loan fees, net | (575) | (672)
Unrealized gains, net | 1,931 | 2,386
Total, at Fair Value | $ 110,208 | $ 120,021

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