EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Benefits
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income
Service cost	$ 291	$ 280
Interest cost	196	174
Expected return on plan assets	(455)	(453)
Amortization of net loss	99	93
Amortization of unrecognized prior service cost	$ (19)	$ (20)
Amortization of unrecognized transition obligation
Net periodic benefit cost (credit)	$ 112	$ 74
SERP Benefits
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income
Service cost	44	42
Interest cost	$ 26	$ 22
Expected return on plan assets
Amortization of net loss	$ 7	$ 8
Amortization of unrecognized prior service cost
Amortization of unrecognized transition obligation	$ 7	$ 7
Net periodic benefit cost (credit)	$ 84	$ 79