THE FREMF TRUSTS - Geographic Concentrations (Details) - FREMF Trusts	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Texas
Concentration Risk [Line Items]
Concentration risk (as a percentage)	16.50%	15.70%
New York
Concentration Risk [Line Items]
Concentration risk (as a percentage)	14.20%	17.90%
Washington
Concentration Risk [Line Items]
Concentration risk (as a percentage)	8.70%	8.40%
Colorado
Concentration Risk [Line Items]
Concentration risk (as a percentage)	7.80%	7.50%
Georgia
Concentration Risk [Line Items]
Concentration risk (as a percentage)	5.70%	5.50%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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