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Multi-family Loans - Preferred Equity and Mezzanine Loan Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |
Unrealized gains, net | $ (1,500) |
Total |  | $ 180,045
Variable Interest Entity, Not Primary Beneficiary | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investment amount | 163,392 | 181,409
Deferred loan fees, net | (1,169) | (1,364)
Unrealized gains, net | 1,370 | 0
Total | $ 163,593 | $ 180,045

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