EMPLOYEE BENEFITS (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of net periodic benefit cost and other amounts recognized in other comprehensive income:
Total recognized in other comprehensive income	$ 1,452	$ (196)	$ 5,529
Pension Benefits
Components of net periodic benefit cost and other amounts recognized in other comprehensive income:
Service cost	1,153	1,134	905
Interest cost	794	706	639
Expected return on plan assets	(1,927)	(1,838)	(1,625)
Amortization of net loss	406	376	27
Amortization of prior service credit	(77)	(77)	(77)
Amortization of transition obligation
Net periodic benefit cost (credit)	349	301	(131)
Net loss (gain)	1,172	(123)	5,099
Amortization of net loss	(406)	(376)	(27)
Amortization of prior service cost	77	77	77
Amortization of transition obligation
Total recognized in other comprehensive income	843	(422)	5,149
SERP Benefits
Components of net periodic benefit cost and other amounts recognized in other comprehensive income:
Service cost	176	168	132
Interest cost	105	91	88
Expected return on plan assets
Amortization of net loss	27	32
Amortization of prior service credit
Amortization of transition obligation	28	28	28
Net periodic benefit cost (credit)	336	319	248
Net loss (gain)	280	(48)	430
Amortization of net loss	(27)	(32)
Amortization of prior service cost
Amortization of transition obligation	(28)	(27)	(27)
Total recognized in other comprehensive income	$ 225	$ (107)	$ 403