EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost: Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Employee benefit plans
Discount rate - employee pension plan	5.27%	3.28%
Long-term rate of return on plan assets	7.50%	6.34%
Rate of compensation increases	4.28%	4.25%
Cost of living adjustment	2.25%	2.20%
Pension Benefits | SERP
Employee benefit plans
Discount rate - employee pension plan	5.24%	3.18%
Rate of compensation increases	5.00%	5.00%
Pension Benefits | Other Benefits
Employee benefit plans
Discount rate - employee pension plan	0.00%	0.00%
Other Benefits
Employee benefit plans
Discount rate - employee pension plan	0.00%	0.00%
Long-term rate of return on plan assets	7.36%	5.88%
Rate of compensation increases	0.00%	0.00%
Cost of living adjustment	0.00%	0.00%
Other Benefits | SERP
Employee benefit plans
Discount rate - employee pension plan	0.00%	0.00%
Rate of compensation increases	0.00%	0.00%
Other Benefits | Other Benefits
Employee benefit plans
Discount rate - employee pension plan	5.27%	3.27%