EMPLOYEE BENEFITS - Amounts Recognized as a Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Retirement Plan
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net loss	$ (23,933)	$ (31,783)
Prior service cost	0	0
Accumulated other comprehensive (loss) income, before tax	(23,933)	(31,783)
Deferred tax benefit	5,026	6,674
Accumulated other comprehensive (loss) income, net of tax	(18,907)	(25,109)
Retirement Plan Acquired
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net loss	(131)	(498)
Prior service cost	0	0
Accumulated other comprehensive (loss) income, before tax	(131)	(498)
Deferred tax benefit	27	104
Accumulated other comprehensive (loss) income, net of tax	(104)	(394)
Restoration Plan
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net loss	(6,004)	(5,575)
Prior service cost	0	0
Accumulated other comprehensive (loss) income, before tax	(6,004)	(5,575)
Deferred tax benefit	1,261	1,171
Accumulated other comprehensive (loss) income, net of tax	$ (4,743)	$ (4,404)