THE FREMF TRUSTS (Details 2) - FREMF trusts [Member]	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Texas
Concentration Risk [Line Items]
Concentration Risk, Percentage	17.90%	19.30%
California
Concentration Risk [Line Items]
Concentration Risk, Percentage		12.20%
New York
Concentration Risk [Line Items]
Concentration Risk, Percentage	15.70%	13.20%
Washington
Concentration Risk [Line Items]
Concentration Risk, Percentage	8.40%	7.10%
Colorado
Concentration Risk [Line Items]
Concentration Risk, Percentage	7.50%	6.40%
Georgia
Concentration Risk [Line Items]
Concentration Risk, Percentage	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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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