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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Supplemental Employee Retirement Plan [Member]        
Net periodic benefit cost        
Service cost $ 84 $ 77 $ 168 $ 154
Interest cost 113 108 226 216
Recognized net actuarial loss 62 55 124 110
Recognized prior service cost   2   4
Net period benefit cost [1] 259 242 518 484
Other Postretirement Benefit Plan        
Net periodic benefit cost        
Service cost 13 15 26 30
Interest cost 36 38 72 76
Recognized net actuarial loss 10 8 20 16
Recognized prior service cost (6) (6) (12) (12)
Net period benefit cost [1] $ 53 $ 55 $ 106 $ 110
[1] (1) Presented within the consolidated statements of income within salaries and employee benefits.