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Multi-family Loans, at Fair Value - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Receivables [Abstract]
Unrealized gains (losses)	$ 0.5	$ 0.1
Loan premiums, early redemption	$ (0.8)	$ (0.6)

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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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