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Multi-family Loans, at Fair Value - Geographic Concentration Risk (Details) - Multi-family loans - Geographic Concentration Risk | 12 Months Ended
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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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