EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension Benefits
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income
Service cost	$ 286	$ 283	$ 577	$ 562
Interest cost	201	176	397	351
Expected return on plan assets	(510)	(458)	(965)	(912)
Amortization of net loss	104	94	203	187
Amortization of unrecognized prior service cost	(19)	(19)	(38)	(38)
Amortization of unrecognized transition obligation
Net periodic benefit cost	62	76	174	150
SERP Benefits
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income
Service cost	44	42	88	83
Interest cost	26	23	52	45
Expected return on plan assets
Amortization of net loss	7	8	14	16
Amortization of unrecognized prior service cost
Amortization of unrecognized transition obligation	7	7	14	14
Net periodic benefit cost	$ 84	$ 80	$ 168	$ 158