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Consolidated K-Series - Geographic Concentrations of Credit Risk (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 17.00% | 16.60%
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 10.00% | 11.30%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 16.10% | 14.80%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Texas |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 12.40% | 13.00%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Maryland |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.80% | 5.00%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.10% | 6.40%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.00% | 4.50%

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