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BENEFIT PLANS, Multi-employer Defined Benefit Plan (Details) - Multiemployer Plans, Pension [Member] - Pentegra DB Plan [Member] - Tupper Lake National Bank [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Multiemployer Plans [Line Items]        
Identification number 135645888      
Plan number 333      
Fair value of plan assets       $ 3,300,000
Projected benefit obligation       $ 3,200,000
Funded status At least 80 percent      
Period contributions $ 30 $ 60 $ 20  
Significance of employer contributions false