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Multi-family Loans, at Fair Value - Geographic Concentration Risk (Details) - Preferred Equity and Mezzanine Loan Investments - Geographic Concentration Risk | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 | Dec. 31, 2023
Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 32.70% | 32.60%
Tennessee |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 15.30% | 15.20%
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.60% | 10.50%
Arkansas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.50% | 9.50%
Louisiana |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 7.70% | 7.50%
Alabama |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.70% | 6.70%
North Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.80% | 5.80%
Indiana |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.20% | 5.30%

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