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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
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Sep. 30, 2023 | Dec. 31, 2022
Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 35.10% | 30.10%
Tennessee |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 14.60% | 15.60%
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.10% | 10.90%
Arkansas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.30% | 0.00%
Louisiana |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.10% | 7.50%
Alabama |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.50% | 7.10%
North Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.70% | 6.10%
Indiana |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.10% | 5.70%

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