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Multi-family Loans, at Fair Value - Geographic Concentration Risk (Details) - Preferred Equity and Mezzanine Loan Investments - Geographic Concentration Risk	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Texas
Concentration Risk [Line Items]
Geographic concentration, percent	17.70%	11.40%
Tennessee
Concentration Risk [Line Items]
Geographic concentration, percent	17.20%	14.30%
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	12.10%	8.50%
South Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	10.30%	7.20%
Georgia
Concentration Risk [Line Items]
Geographic concentration, percent	7.30%	10.10%
Ohio
Concentration Risk [Line Items]
Geographic concentration, percent	7.20%	5.20%
North Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	6.90%	4.90%

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