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THE FREMF TRUSTS - Geographic Concentrations (Details) - Geographic Concentration Risk - FREMF Trusts
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
New York    
Concentration Risk [Line Items]    
Concentration risk, percentage 16.60% 16.50%
Texas    
Concentration Risk [Line Items]    
Concentration risk, percentage 14.20% 14.20%
Washington    
Concentration Risk [Line Items]    
Concentration risk, percentage 8.70% 8.70%
Colorado    
Concentration Risk [Line Items]    
Concentration risk, percentage 7.80% 7.80%
Georgia    
Concentration Risk [Line Items]    
Concentration risk, percentage 5.70% 5.70%