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EMPLOYEE BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2018
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)2018201720182017
Service Cost$1,721$1,688$5,163$5,064
Interest Cost1,4151,4374,2464,312
Expected Return on Plan Assets(2,391)(2,006)(7,173)(6,019)
Prior Service Cost Amortization5056150167
Net Loss Amortization9189532,7542,859
Net Periodic Benefit Cost$1,713$2,128$5,140$6,383
Discount Rate3.71%4.21%3.71%4.21%
Long-term Rate of Return on Assets7.25%7.25%7.25%7.25%
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)2018201720182017
Interest Cost$57$48$170$143
Net Loss Amortization4061491,220448
Net Periodic Benefit Cost$463$197$1,390$591
Discount Rate3.53%3.92%3.53%3.92%