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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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Financial Instrument Owned, Loans And Preferred Equity, Net

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Unrealized Gain (Loss) Loans and Preferred Equity and Mezzanine Loans

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of investments classified as other.

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