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EMPLOYEE BENEFITS - Net Periodic Benefit Cost and Postretirement Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Retirement Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Interest cost $ 3,771 $ 2,741 $ 2,570
Expected return on assets (4,573) (5,845) (5,420)
Net loss amortization 726 640 1,002
Gain recognized due to settlement 0 0 0
Net periodic benefit cost (income) (76) (2,464) (1,848)
Retirement Plan Acquired      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Interest cost 126 102 92
Expected return on assets (187) (232) (211)
Net loss amortization 0 0 6
Gain recognized due to settlement (16) 0 0
Net periodic benefit cost (income) (77) (130) (113)
Restoration Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Interest cost 831 578 520
Net loss amortization 30 255 256
Gain recognized due to settlement 0 0 0
Net periodic benefit cost (income) $ 861 $ 833 $ 776