EMPLOYEE BENEFITS - Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in next fiscal year (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Defined Benefit Pension Plan
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net loss	$ 1,774
Prior service (credit) cost	(14)
Total amount that will be amortized from accumulated other comprehensive income	1,760
Deferred tax benefit	(370)
Accumulated other comprehensive loss, net of tax	1,390
Defined Benefit Pension Plan Acquired
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net loss	0
Prior service (credit) cost	0
Total amount that will be amortized from accumulated other comprehensive income	0
Deferred tax benefit	0
Accumulated other comprehensive loss, net of tax	0
Restoration Plan
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net loss	398
Prior service (credit) cost	6
Total amount that will be amortized from accumulated other comprehensive income	404
Deferred tax benefit	(85)
Accumulated other comprehensive loss, net of tax	$ 319