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BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
May 12, 2017
Dec. 31, 2016
Pension Benefits [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Unamortized actuarial gain           $ 1,900  
Discount rate           4.40% 4.50%
Employer contributions   $ 2,900          
Net periodic benefit cost [Abstract]              
Service cost $ 1,067   $ 1,027 $ 2,106 $ 2,052    
Interest cost 1,449   1,406 2,812 2,812    
Expected return on plan assets (3,407)   (2,961) (6,529) (5,921)    
Amortization of unrecognized net loss 209   377 472 754    
Amortization of prior service cost 17   11 30 22    
Net periodic benefit cost (income) (665)   (140) (1,109) (281)    
Post-retirement Benefits [Member]              
Net periodic benefit cost [Abstract]              
Service cost 0   0 0 0    
Interest cost 19   20 38 41    
Expected return on plan assets 0   0 0 0    
Amortization of unrecognized net loss 2   (1) 4 (3)    
Amortization of prior service cost (45)   (45) (89) (89)    
Net periodic benefit cost (income) (24)   $ (26) $ (47) $ (51)    
Merchants Bancshares, Inc. [Member] | Pension Benefits [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions $ 2,000