Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS (Details)

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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Pension Plan [Member]        
Components of Net Periodic Benefit Costs:        
Service Cost $ 1,721 $ 1,688 $ 5,163 $ 5,064
Interest Cost 1,415 1,437 4,246 4,312
Expected Return on Plan Assets (2,391) (2,006) (7,173) (6,019)
Prior Service Cost Amortization 50 56 150 167
Net Gain (Loss) Amortization 918 953 2,754 2,859
Net Periodic Benefit Cost (Income) $ 1,713 $ 2,128 $ 5,140 $ 6,383
Discount Rate (in percent) 3.71% 4.21% 3.71% 4.21%
Long-Term Rate of Return on Assets (in percent) 7.25% 7.25% 7.25% 7.25%
Actual Contributions     $ 23,000  
Supplemental Executive Retirement Plan [Member]        
Components of Net Periodic Benefit Costs:        
Interest Cost $ 57 $ 48 170 $ 143
Net Gain (Loss) Amortization 406 149 1,220 448
Net Periodic Benefit Cost (Income) $ 463 $ 197 $ 1,390 $ 591
Discount Rate (in percent) 3.53% 3.92% 3.53% 3.92%