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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, 2021 | Dec. 31, 2020
Tennessee |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 16.00% | 14.30%
Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 15.20% | 11.40%
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 11.30% | 8.50%
South Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 9.50% | 7.20%
Alabama |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.80% | 9.70%
Georgia |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.80% | 10.10%
Ohio |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.80% | 5.20%
North Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.50% | 4.90%

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