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Consolidated K-Series - Geographic Concentrations of Credit Risk (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Texas
Concentration Risk [Line Items]
Geographic concentration, percent	10.60%	16.60%
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	9.40%	11.30%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	15.40%	14.80%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	12.00%	13.00%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	6.30%	5.00%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	5.40%	4.50%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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