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Consolidated K-Series - Geographic Concentrations of Credit Risk (Details) - VIE, Primary Beneficiary - Consolidated K-Series - Geographic Concentration Risk - Multi-family loans held in securitization trusts | 12 Months Ended
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Dec. 31, 2019
California |
Concentration Risk [Line Items] |
Geographic concentration, percent | 15.90%
Texas |
Concentration Risk [Line Items] |
Geographic concentration, percent | 12.40%
Florida |
Concentration Risk [Line Items] |
Geographic concentration, percent | 6.20%
Maryland |
Concentration Risk [Line Items] |
Geographic concentration, percent | 5.80%

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