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Multi-family Loans, at Fair Value - Geographic Concentration Risk (Details) - Preferred Equity and Mezzanine Loan Investments	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Tennessee | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	15.60%	14.30%
Texas | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	12.50%	11.40%
Georgia | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	11.10%	10.10%
Alabama | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	10.60%	9.70%
Florida | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	9.30%	8.50%
South Carolina | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	7.80%	7.20%
Missouri | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	6.20%	5.70%
Ohio | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	5.20%
North Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	5.30%
North Carolina | Geographic Concentration Risk
Concentration Risk [Line Items]
Geographic concentration, percent		4.90%

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