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EMPLOYEE BENEFIT PLANS (Components of the net periodic benefit cost) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Pension Plan [Member]    
Components of Net Periodic Benefit Costs:    
Service Cost $ 1,743,000 $ 1,457,000
Interest Cost 1,221,000 1,411,000
Expected Return on Plan Assets (2,787,000) (2,748,000)
Prior Service Cost Amortization 4,000 4,000
Net Loss Amortization 1,691,000 1,011,000
Special Termination Charge 0 61,000
Net Periodic Benefit Cost $ 1,872,000 $ 1,196,000
Discount Rate Used for Benefit Cost 2.88% 3.53%
Long-Term Rate of Return on Assets 6.75% 7.00%
Supplemental Executive Retirement Plan [Member]    
Components of Net Periodic Benefit Costs:    
Service Cost $ 9,000 $ 0
Interest Cost 59,000 72,000
Prior Service Cost Amortization 19,000 0
Net Loss Amortization 198,000 247,000
Net Periodic Benefit Cost $ 285,000 $ 319,000
Discount Rate Used for Benefit Cost 2.38% 3.16%