RETIREMENT PLANS, COSTS OF RETIREMENT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
401(k) plan expense	$ 359	$ 346	$ 326
Qualified noncontributory defined benefit retirement plan
Defined Benefit Plan Disclosure [Line Items]
Plan expense	$ 969	$ 984	$ 967