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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, 2022	Dec. 31, 2021
Texas
Concentration Risk [Line Items]
Geographic concentration, percent	27.30%	28.30%
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	15.20%	12.20%
Tennessee
Concentration Risk [Line Items]
Geographic concentration, percent	14.00%	11.00%
Ohio
Concentration Risk [Line Items]
Geographic concentration, percent	8.80%	7.20%
Louisiana
Concentration Risk [Line Items]
Geographic concentration, percent	6.80%	5.80%
Alabama
Concentration Risk [Line Items]
Geographic concentration, percent	6.40%	5.00%
North Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	5.50%	7.00%
Indiana
Concentration Risk [Line Items]
Geographic concentration, percent	5.20%	4.30%

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