EMPLOYEE BENEFIT PLANS (Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Qualified Plan
Weighted Average Assumptions Used to Determine Benefit Obligations
Discount rate - benefit obligations	5.22%	2.78%
Rate of compensation increase	4.27%	4.26%
Discount rates:
Effective rate for service cost	2.80%	2.40%	2.94%
Effective rate for interest cost	2.33%	1.74%	2.50%
Effective rate for interest on service cost	2.45%	1.92%	2.59%
Cash balance interest credit rate	2.06%	1.57%	2.19%
Expected long-term rate of return on plan assets	5.50%	5.25%	5.75%
Rate of compensation increase	4.26%	4.28%	4.28%
Supplemental Plan
Weighted Average Assumptions Used to Determine Benefit Obligations
Discount rate - benefit obligations	5.24%	2.73%
Rate of compensation increase	4.50%	4.50%
Discount rates:
Effective rate for service cost	2.73%	2.26%	2.79%
Effective rate for interest cost	2.24%	1.53%	2.33%
Effective rate for interest on service cost	2.29%	1.75%	2.42%
Cash balance interest credit rate	2.06%	1.57%	2.19%
Rate of compensation increase	4.50%	4.50%	4.50%
Post-Retirement Medical Plan
Weighted Average Assumptions Used to Determine Benefit Obligations
Discount rate - benefit obligations	5.15%	2.46%
Rate of compensation increase	0.00%	0.00%
Discount rates:
Effective rate for service cost	2.80%	2.35%	2.86%
Effective rate for interest cost	1.91%	1.28%	2.21%
Effective rate for interest on service cost	2.65%	2.11%	2.68%