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Multi-family Loans, at Fair Value - Geographic Concentration Risk (Details) - Preferred equity and mezzanine loan investments - Geographic Concentration Risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Texas
Concentration Risk [Line Items]
Geographic concentrations	28.30%	11.40%
Florida
Concentration Risk [Line Items]
Geographic concentrations	12.20%	8.50%
Tennessee
Concentration Risk [Line Items]
Geographic concentrations	11.00%	14.30%
Georgia
Concentration Risk [Line Items]
Geographic concentrations	7.40%	10.10%
Ohio
Concentration Risk [Line Items]
Geographic concentrations	7.20%	5.20%
North Carolina
Concentration Risk [Line Items]
Geographic concentrations	7.00%	4.90%
Louisiana
Concentration Risk [Line Items]
Geographic concentrations	5.80%	0.00%
Alabama
Concentration Risk [Line Items]
Geographic concentrations	5.00%	9.70%

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