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EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost: Weighted Average Assumptions (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits    
Employee benefit plans    
Discount rate - employee pension plan 3.08% 3.20%
Long-term rate of return on plan assets 6.50% 6.25%
Rate of compensation increases 4.00% 3.25%
Cost of living adjustment 2.10% 2.50%
Cost of living adjustment 2.20% 2.10%
Pension Benefits | SERP    
Employee benefit plans    
Discount rate - employee pension plan 2.97% 3.20%
Rate of compensation increases 5.00% 3.75%
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 6.00% 5.50%
Rate of compensation increases 0.00% 0.00%
Cost of living adjustment 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 3.03% 3.25%