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PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Plan        
PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS        
Interest cost $ 212 $ 242 $ 212 $ 242
Expected return on plan assets (195) (204) (207) (274)
Amortization of net actuarial loss 112 188 224 351
Settlement 4,884 0 4,884 0
Net periodic benefit cost 5,013 226 5,113 319
SERPs        
PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS        
Interest cost 75 66 150 132
Amortization of net actuarial loss 21 84 42 167
Amortization of net transition obligation 4 4 8 9
Net periodic benefit cost $ 100 $ 154 $ 200 $ 308