EMPLOYEE BENEFITS - Amounts in Accumulated Other Comprehensive Income (Loss) Recognized in Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	$ 1,512	$ 1,312	$ 1,642
Prior service (credit) cost	(14)	(14)	(14)
Loss (gain) recognized due to settlement	0	0	0
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	1,498	1,298
Deferred tax (expense) benefit	(315)	(454)
Accumulated other comprehensive income (loss), net of tax	1,183	844
Defined Benefit Pension Plan Acquired
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	0	0	0
Prior service (credit) cost	0	0	0
Loss (gain) recognized due to settlement	0	8	(8)
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	0	8
Deferred tax (expense) benefit	0	(2)
Accumulated other comprehensive income (loss), net of tax	0	6
Restoration Plan
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	677	301	186
Prior service (credit) cost	7	6	6
Loss (gain) recognized due to settlement	0	0	$ 0
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	684	307
Deferred tax (expense) benefit	(144)	(107)
Accumulated other comprehensive income (loss), net of tax	$ 540	$ 200