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Multi-family Loans, at Fair Value - Geographic Concentration Risk (Details) - Preferred Equity and Mezzanine Loan Investments - Geographic Concentration Risk | 6 Months Ended | 12 Months Ended
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Jun. 30, 2022 | Dec. 31, 2021
Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 25.10% | 28.30%
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 13.90% | 12.20%
Tennessee |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 12.70% | 11.00%
Georgia |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.50% | 7.40%
Ohio |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.10% | 7.20%
Louisiana |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.30% | 5.80%
Alabama |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.80% | 5.00%
North Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.00% | 7.00%

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