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Multi-family Loans, at Fair Value - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unrealized (losses) gains, net	$ (2.7)	$ 1.0	$ (1.5)
Loan premiums and early redemption	$ 1.0	$ 2.5	$ 1.1

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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 and Mezzanine Loans

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