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EMPLOYEE BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of expected benefit payments related to the defined benefit pension plan
Three Months Ended September 30,Nine Months Ended September 30,
(Dollars in Thousands)2017201620172016
Service Cost$1,688$1,613$5,064$4,839
Interest Cost1,4371,3974,3124,191
Expected Return on Plan Assets(2,006)(1,934)(6,019)(5,802)
Prior Service Cost Amortization5669167207
Net Loss Amortization9538012,8592,403
Net Periodic Benefit Cost$2,128$1,946$6,383$5,838
Discount Rate4.21%4.52%4.21%4.52%
Long-term Rate of Return on Assets7.25%7.50%7.25%7.50%
Schedule of expected benefit payments related to the SERP
The components of the net periodic benefit cost for the Company's SERP were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(Dollars in Thousands)2017201620172016
Interest Cost$48$40$143$120
Net Loss Amortization149190448570
Net Periodic Benefit Cost$197$230$591$690
Discount Rate3.92%4.13%3.92%4.13%