Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS (Components of the net periodic benefit cost) (Details)

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EMPLOYEE BENEFIT PLANS (Components of the net periodic benefit cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Components of Net Periodic Benefit Costs:          
Settlement Loss $ 500 $ 2,000 $ 0 $ 2,500 $ 0
Defined Benefit Pension Plan [Member]          
Components of Net Periodic Benefit Costs:          
Service Cost 1,743   1,457 5,229 4,371
Interest Cost 1,221   1,400 3,664 4,212
Expected Return on Plan Assets (2,787)   (2,748) (8,361) (8,245)
Prior Service Cost Amortization 4   4 11 11
Net Loss Amortization 1,691   974 5,073 2,959
Settlement Loss 500   0 2,500 0
Special Termination Charge 0   0 0 61
Net Periodic Benefit Cost $ 2,372   $ 1,087 $ 8,116 $ 3,369
Discount Rate 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 $ 27 $ 21
Interest Cost 61   83 183 238
Prior Service Cost Amortization 69   109 157 218
Net Loss Amortization 243   93 683 410
Net Periodic Benefit Cost $ 382   $ 295 $ 1,050 $ 887
Discount Rate 2.38%   3.16% 2.38% 3.16%