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Multi-family Loans, at Fair Value - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Receivables [Abstract]
Unrealized gains (losses)	$ 200,000	$ (100,000)	$ 300,000	$ (5,800,000)
Loan premiums, early redemption	$ 1,500,000	$ 0	$ 2,000,000.0	$ 100,000

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- Definition

Loan Premiums, Loans and Preferred Equity and Mezzanine Loans, Early Redemption

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- Definition

Unrealized Gain (Loss) Loans and Preferred Equity

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