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PENSION AND OTHER POSTRETIREMENT PLANS (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of net periodic benefit cost and other amounts recognized in other comprehensive income:      
Total recognized in other comprehensive income $ 302 $ 1,452 $ (196)
Pension Benefits      
Components of net periodic benefit cost and other amounts recognized in other comprehensive income:      
Service cost 1,129 1,153 1,134
Interest cost 750 794 706
Expected return on plan assets (2,129) (1,927) (1,838)
Amortization of net loss 479 406 376
Amortization of prior service credit (77) (77) (77)
Amortization of transition obligation 0 0 0
Net periodic benefit cost 152 349 301
Net loss (gain) (409) 1,172 (123)
Amortization of net loss (479) (406) (376)
Amortization of prior service credit 77 77 77
Amortization of transition obligation 0 0 0
Total recognized in other comprehensive income (811) 843 (422)
SERP Benefits      
Components of net periodic benefit cost and other amounts recognized in other comprehensive income:      
Service cost 212 176 168
Interest cost 105 105 91
Expected return on plan assets 0 0 0
Amortization of net loss 51 27 32
Amortization of prior service credit 0 0 0
Amortization of transition obligation 27 28 28
Net periodic benefit cost 395 336 319
Net loss (gain) 710 280 (48)
Amortization of net loss (51) (27) (32)
Amortization of prior service credit 0 0 0
Amortization of transition obligation (27) (28) (27)
Total recognized in other comprehensive income $ 632 $ 225 $ (107)