EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Pension Benefits
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income
Service cost	$ 292	$ 291
Interest cost	185	196
Expected return on plan assets	(520)	(455)
Amortization of net loss	113	99
Amortization of prior service credit	(19)	(19)
Amortization of transition obligation
Net periodic benefit cost	51	112
SERP Benefits
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income
Service cost	53	44
Interest cost	26	26
Expected return on plan assets
Amortization of net loss	13	7
Amortization of prior service credit
Amortization of transition obligation	7	7
Net periodic benefit cost	$ 99	$ 84