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EMPLOYEE BENEFIT PLANS (Components of the net periodic benefit cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Components of Net Periodic Benefit Costs:    
Pension Settlement $ 209 $ 0
Defined Benefit Pension Plan [Member]    
Components of Net Periodic Benefit Costs:    
Service Cost 1,572 1,743
Interest Cost 1,166 1,221
Expected Return on Plan Assets (2,675) (2,787)
Prior Service Cost Amortization 4 4
Net Loss Amortization 428 1,691
Pension Settlement 209 0
Net Periodic Benefit Cost $ 704 $ 1,872
Discount Rate Used for Benefit Cost 3.11% 2.88%
Long-Term Rate of Return on Assets 6.75% 6.75%
Supplemental Executive Retirement Plan [Member]    
Components of Net Periodic Benefit Costs:    
Service Cost $ 8 $ 9
Interest Cost 79 59
Prior Service Cost Amortization 69 19
Net Loss Amortization 180 198
Net Periodic Benefit Cost $ 336 $ 285
Discount Rate Used for Benefit Cost 2.80% 2.38%