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EMPLOYEE BENEFIT PLANS (Components of the net periodic benefit cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Components of Net Periodic Benefit Costs:        
Settlement Loss $ 2,000 $ 0 $ 2,000 $ 0
Defined Benefit Pension Plan [Member]        
Components of Net Periodic Benefit Costs:        
Service Cost 1,743 1,457 3,486 2,914
Interest Cost 1,221 1,400 2,442 2,811
Expected Return on Plan Assets (2,787) (2,748) (5,574) (5,496)
Prior Service Cost Amortization 4 4 8 8
Net Loss Amortization 1,691 974 3,382 1,985
Settlement Loss 2,000 0 2,000 0
Special Termination Charge 0 0 0 61
Net Periodic Benefit Cost $ 3,872 $ 1,087 $ 5,744 $ 2,283
Discount Rate Used for Benefit Cost 2.88% 3.53% 2.88% 3.53%
Long-Term Rate of Return on Assets 6.75% 7.00% 6.75% 7.00%
Supplemental Executive Retirement Plan [Member]        
Components of Net Periodic Benefit Costs:        
Service Cost $ 9 $ 10 $ 18 $ 10
Interest Cost 61 83 120 155
Prior Service Cost Amortization 69 109 88 109
Net Loss Amortization 243 71 441 318
Net Periodic Benefit Cost $ 382 $ 273 $ 667 $ 592
Discount Rate Used for Benefit Cost 2.38% 3.16% 2.38% 3.16%