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EMPLOYEE BENEFITS - Assumptions Used to Calculate Benefit Obligation, Net Periodic Benefit Cost and Postretirement Benefit (Details)
3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Retirement Plan          
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount rate     5.13% 5.46%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount rate     5.46% 2.95% 2.65%
Expected long-term rate of return on plan assets 6.125% 6.50% 6.13% 6.13% 6.13%
Retirement Plan Acquired          
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount rate     5.13% 5.46%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount rate     5.46% 2.95% 2.65%
Expected long-term rate of return on plan assets 6.125% 6.50% 6.13% 6.13% 6.13%
Restoration Plan          
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount rate     5.13% 5.46%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount rate     5.46% 2.95% 2.65%