EMPLOYEE BENEFIT PLANS - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans
Projected benefit obligation
Discount rate beginning of year	3.56%
Net periodic pension cost
Discount rate	4.09%
Long term rate of return on plan assets	7.00%
Non-qualified Supplemental Executive Retirement Plan
Projected benefit obligation
Discount rate beginning of year	3.13%	3.31%	3.48%