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Consolidated K-Series - Geographic Concentrations of Credit Risk (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Texas
Concentration Risk [Line Items]
Geographic concentration, percent	21.70%	24.30%
New York
Concentration Risk [Line Items]
Geographic concentration, percent	22.00%	24.10%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	14.70%	14.70%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	12.70%	12.70%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	6.50%	6.50%
Geographic Concentration Risk | Multi-family loans held in securitization trusts | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	5.50%	5.50%

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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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