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Multi-family Loans, at Fair Value - Geographic Concentration Risk (Details) - Multi-family loans - Geographic Concentration Risk	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Texas
Concentration Risk [Line Items]
Geographic concentrations	30.10%	28.30%
Tennessee
Concentration Risk [Line Items]
Geographic concentrations	15.60%	11.00%
Florida
Concentration Risk [Line Items]
Geographic concentrations	10.90%	12.20%
Ohio
Concentration Risk [Line Items]
Geographic concentrations	9.70%	7.20%
Louisiana
Concentration Risk [Line Items]
Geographic concentrations	7.50%	5.80%
Alabama
Concentration Risk [Line Items]
Geographic concentrations	7.10%	5.00%
North Carolina
Concentration Risk [Line Items]
Geographic concentrations	6.10%	7.00%
Indiana
Concentration Risk [Line Items]
Geographic concentrations	5.70%	4.30%

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