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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, 2021 | Dec. 31, 2020
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Investment amount | $ 151,427 | $ 163,392
Deferred loan fees, net | (1,067) | (1,169)
Unrealized gains, net | 1,476 | 1,370
Total | $ 151,836 | $ 163,593

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