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Consolidated K-Series - Geographic Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Texas
Concentration Risk [Line Items]
Geographic concentrations	24.30%	43.30%
New York
Concentration Risk [Line Items]
Geographic concentrations	24.10%	0.00%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentrations	14.70%	13.80%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentrations	12.70%	12.40%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentrations	6.50%	8.10%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Maryland
Concentration Risk [Line Items]
Geographic concentrations	5.50%	5.30%

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