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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, 2023	Dec. 31, 2022
Texas
Concentration Risk [Line Items]
Geographic concentrations	32.60%	30.10%
Tennessee
Concentration Risk [Line Items]
Geographic concentrations	15.20%	15.60%
Florida
Concentration Risk [Line Items]
Geographic concentrations	10.50%	10.90%
Arkansas
Concentration Risk [Line Items]
Geographic concentrations	9.50%	0.00%
Louisiana
Concentration Risk [Line Items]
Geographic concentrations	7.50%	7.50%
Alabama
Concentration Risk [Line Items]
Geographic concentrations	6.70%	7.10%
North Carolina
Concentration Risk [Line Items]
Geographic concentrations	5.80%	6.10%
Indiana
Concentration Risk [Line Items]
Geographic concentrations	5.30%	5.70%

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