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Consolidated K-Series and Consolidated SLST - Geographic Concentrations of Credit Risk (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.60% | 16.60%
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 12.00% | 11.30%
New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 5.00% | 2.60%
Consolidated K-Series | Geographic Concentration Risk | Multi-family loans held in securitization trusts | California |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 15.90% | 14.80%
Consolidated K-Series | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 12.40% | 13.00%
Consolidated K-Series | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 6.20% | 4.50%
Consolidated K-Series | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 5.80% | 5.00%
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | California |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 11.00% |
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 10.60% |
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 9.10% |
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | New Jersey |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 6.90% |
Consolidated SLST | Geographic Concentration Risk | Multi-family loans held in securitization trusts | Illinois |  |
Concentration Risk [Line Items] |  |
Geographic concentrations | 6.60% |

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