EMPLOYEE BENEFITS - Allocation of Plan Assets (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocations	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Minimum target asset allocation	45.00%
Maximum target asset allocation	55.00%
Actual asset allocations	49.60%	47.10%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Minimum target asset allocation	40.00%
Maximum target asset allocation	50.00%
Actual asset allocations	45.20%	47.30%
Other
Defined Benefit Plan Disclosure [Line Items]
Minimum target asset allocation	0.00%
Maximum target asset allocation	10.00%
Actual asset allocations	5.20%	5.60%