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Multi-family Loans - Geographic Concentration Risk (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Tennessee | Multi-family loans |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 14.30% | 12.30%
FLORIDA | VIE, Primary Beneficiary | Consolidated K-Series | Geographic Concentration Risk | Consolidated K-Series |  |
Concentration Risk [Line Items] |  |
Geographic concentrations |  | 6.20%
FLORIDA | Multi-family loans |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 11.40% | 10.60%
Georgia | Multi-family loans |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.10% | 11.80%
TEXAS | VIE, Primary Beneficiary | Consolidated K-Series | Geographic Concentration Risk | Consolidated K-Series |  |
Concentration Risk [Line Items] |  |
Geographic concentrations |  | 12.40%
TEXAS | Multi-family loans |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 9.70% | 10.00%
Florida | Multi-family loans |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 8.50% | 12.00%
New Jersey | Multi-family loans |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 7.20% | 6.30%
NEW JERSEY |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 5.70% | 4.90%
NEW JERSEY | Multi-family loans |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 5.80% | 5.00%
Ohio |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 5.20% | 0.00%
South Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 5.00% | 8.40%
CALIFORNIA | VIE, Primary Beneficiary | Consolidated K-Series | Geographic Concentration Risk | Consolidated K-Series |  |
Concentration Risk [Line Items] |  |
Geographic concentrations |  | 15.90%
Maryland | VIE, Primary Beneficiary | Consolidated K-Series | Geographic Concentration Risk | Consolidated K-Series |  |
Concentration Risk [Line Items] |  |
Geographic concentrations |  | 5.80%

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