EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	$ 18,515	$ 18,960
Service cost	1,153	1,134	$ 905
Interest cost	794	706	639
Benefits paid and expected expenses	(279)	(264)
Assumption changes and other	661	(2,021)
Benefit obligation at end of year	20,844	18,515	18,960
Change in plan assets, at fair value:
Fair value of plan assets at beginning of year	24,562	23,887
Actual return on plan assets	1,416	(60)
Employer contribution	2,215	999
Benefits paid and actual expenses	(279)	(264)
Fair value of plan assets at end of year	27,914	24,562	23,887
Funded status at end of year	7,070	6,047
SERP Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	2,555	2,457
Service cost	176	168	132
Interest cost	105	91	88
Benefits paid and expected expenses	(112)	(112)
Assumption changes and other	280	(49)
Benefit obligation at end of year	3,004	2,555	2,457
Change in plan assets, at fair value:
Fair value of plan assets at beginning of year
Actual return on plan assets
Employer contribution	112	112
Benefits paid and actual expenses	(112)	(112)
Fair value of plan assets at end of year
Funded status at end of year	$ (3,004)	$ (2,555)