EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Benefits
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income
Service cost	$ 288	$ 286	$ 865	$ 848
Interest cost	199	178	596	529
Expected return on plan assets	(482)	(463)	(1,447)	(1,375)
Amortization of net loss	102	95	305	281
Amortization of unrecognized prior service cost	(20)	(19)	(58)	(58)
Amortization of unrecognized transition obligation
Net periodic benefit cost	87	77	261	225
SERP Benefits
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income
Service cost	44	42	132	126
Interest cost	27	23	79	68
Expected return on plan assets
Amortization of net loss	6	8	20	24
Amortization of unrecognized prior service cost
Amortization of unrecognized transition obligation	7	7	21	21
Net periodic benefit cost	$ 84	$ 80	$ 252	$ 239