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RETIREMENT PLANS, ASSUMPTIONS USED (Details) - Qualified noncontributory defined benefit retirement plan
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Benefit obligation:      
Discount rate 5.02% 2.83% 2.52%
Salary increase rate 0.00% 0.00% 0.00%
Net periodic pension cost:      
Discount rate 2.83% 2.52% 3.22%
Salary increase rate 0.00% 0.00% 0.00%
Amortization period in years 19 years 4 months 28 days 20 years 1 month 28 days 21 years 2 months 26 days