v3.25.4
EMPLOYEE BENEFIT PLANS (Assumptions Used) (Details)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Qualified Plan      
Weighted Average Assumptions Used to Determine Benefit Obligations      
Discount rate - benefit obligations 5.54% 5.63%  
Rate of compensation increase 4.55% 4.55%  
Discount rates:      
Effective rate for service cost 5.65% 5.00% 5.22%
Effective rate for interest cost 5.32% 4.90% 5.14%
Effective rate for interest on service cost 5.39% 4.89% 5.14%
Cash balance interest credit rate 4.63% 3.99% 4.04%
Expected long-term rate of return on plan assets 6.90% 6.80% 6.75%
Rate of compensation increase 4.55% 4.55% 4.27%
Supplemental Plan      
Weighted Average Assumptions Used to Determine Benefit Obligations      
Discount rate - benefit obligations 5.27% 5.54%  
Rate of compensation increase 5.00% 5.00%  
Discount rates:      
Effective rate for service cost 5.57% 4.94% 5.24%
Effective rate for interest cost 5.20% 4.90% 5.14%
Effective rate for interest on service cost 5.31% 4.84% 5.12%
Cash balance interest credit rate 4.63% 3.99% 4.04%
Rate of compensation increase 5.00% 4.50% 4.50%
Post-Retirement Medical Plan      
Weighted Average Assumptions Used to Determine Benefit Obligations      
Discount rate - benefit obligations 5.04% 5.39%  
Rate of compensation increase 0.00% 0.00%  
Discount rates:      
Effective rate for service cost 5.62% 5.00% 5.27%
Effective rate for interest cost 5.10% 4.82% 5.05%
Effective rate for interest on service cost 5.50% 4.93% 5.21%