EMPLOYEE BENEFITS - Assumptions Used in Determining Actuarial Present Value of Benefit Obligations and Net Periodic Benefit Cost (Details)		4 Months Ended	8 Months Ended	12 Months Ended
		Dec. 31, 2014	Aug. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assumptions for benefit obligations
Expected long-term rate of return on plan assets		7.50%		7.50%	7.50%	7.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Expected long-term rate of return on plan assets				7.50%	7.50%	7.50%
Qualified Plan
Assumptions for benefit obligations
Discount rate		4.125%		4.19%	4.64%	4.125%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	[1]	4.25%	5.00%	4.64%	4.125%
Non-Qualified Plan
Assumptions for benefit obligations
Discount rate		3.875%		4.05%	4.54%	3.875%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	[2]	4.00%	4.75%	4.54%	3.875%

[1] for January 1 - August 31, 2014 period; 4.25% for September 1 - December 31, 2014 period.

[2] for January 1 - August 31, 2014 period; 4.00% for September 1 - December 31, 2014 period.