Annual report pursuant to Section 13 and 15(d)

RETIREMENT PLANS AND RELATED POST RETIREMENT BENEFITS - Narrative (Details)

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RETIREMENT PLANS AND RELATED POST RETIREMENT BENEFITS - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
retirement_plan
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Defined Benefit Plan Disclosure      
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan 2    
Accumulated benefit obligation of the plans $ 22,000,000 $ 20,500,000  
Fair value of plan assets at period end 0 0  
Unrecognized prior service costs 600,000    
Unrecognized prior service costs, net 1,200,000    
Unrecognized prior service costs, tax 600,000    
Unrecognized actuarial losses 2,000,000    
Unrecognized actuarial losses, gross (3,600,000)    
Unrecognized actuarial losses, tax $ 1,600,000    
Percentage of fund 99.20%    
Contribution of employer $ 700,000 500,000 $ 400,000
Total employer contribution 1.00%    
SERP      
Defined Benefit Plan Disclosure      
Actuarial loss $ 1,529,000 (4,917,000)  
Decrease in the discount rate 0.21%    
Current accrued pension liability $ 300,000    
Long-term accrued pension liability 28,400,000    
Benefits expected to be paid 2024 700,000    
Benefits expected to be paid 2025 600,000    
Benefits expected to be paid 2026 600,000    
Benefits expected to be paid 2027 900,000    
Benefits expected to be paid 2028 1,900,000    
Benefits expected to be paid thereafter 11,100,000    
SERP Medical      
Defined Benefit Plan Disclosure      
Current accrued pension liability 100,000    
Long-term accrued pension liability 800,000    
Change in retirement benefit obligation $ 800,000 $ 800,000