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EMPLOYEE BENEFITS - Net Periodic Benefit Cost and Postretirement Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Retirement plan curtailment expense $ 0 $ 0 $ 163
Loss recognized due to settlement 0 0 215
Retirement Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0 0 1,793
Interest cost 2,741 2,570 3,031
Expected return on assets (5,845) (5,420) (5,676)
Net loss amortization 640 1,002 2,474
Prior service cost (credit) amortization 0 0 (14)
Retirement plan curtailment expense 0 0 151
Loss recognized due to settlement 0 0 0
Net periodic benefit cost (income) (2,464) (1,848) 1,759
Retirement Plan Acquired      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0 0 0
Interest cost 102 92 162
Expected return on assets (232) (211) (301)
Net loss amortization 0 6 10
Prior service cost (credit) amortization 0 0 0
Retirement plan curtailment expense 0 0 0
Loss recognized due to settlement 0 0 215
Net periodic benefit cost (income) (130) (113) 86
Restoration Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0 0 429
Interest cost 578 520 568
Net loss amortization 255 256 551
Prior service cost (credit) amortization 0 0 7
Retirement plan curtailment expense 0 0 12
Loss recognized due to settlement 0 0 0
Net periodic benefit cost (income) $ 833 $ 776 $ 1,567