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Consolidated K-Series - Geographic Concentrations of Credit Risk (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Texas
Concentration Risk [Line Items]
Geographic concentration, percent	11.90%	16.60%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	16.00%	14.80%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	12.50%	13.00%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	6.00%	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%

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