EMPLOYEE BENEFITS - Amounts in Accumulated Other Comprehensive Income (Loss) Recognized in Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Retirement plan curtailment expense	$ 0	$ 163	$ 0
Recognition of loss due to settlement	0	215	0
Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	1,002	2,474	1,827
Prior service (credit) cost	0	(14)	(14)
Retirement plan curtailment expense	0	151	0
Recognition of loss due to settlement	0	0	0
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	1,002	2,611
Deferred tax expense	(211)	(548)
Accumulated other comprehensive income (loss), net of tax	791	2,063
Retirement Plan Acquired
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	6	10	0
Prior service (credit) cost	0	0	0
Retirement plan curtailment expense	0	0	0
Recognition of loss due to settlement	0	215	0
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	6	225
Deferred tax expense	0	(47)
Accumulated other comprehensive income (loss), net of tax	6	178
Restoration Plan
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	256	551	559
Prior service (credit) cost	0	7	6
Retirement plan curtailment expense	0	12	0
Recognition of loss due to settlement	0	0	$ 0
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	256	570
Deferred tax expense	(54)	(120)
Accumulated other comprehensive income (loss), net of tax	$ 202	$ 450