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EMPLOYEE BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2018
Compensation and Retirement Disclosure [Abstract]  
Schedule of expected benefit payments related to the defined benefit pension plan
Three Months Ended June 30,Six Months Ended June 30,
(Dollars in Thousands)2018201720182017
Service Cost$1,721$1,688$3,442$3,376
Interest Cost1,4151,4372,8302,874
Expected Return on Plan Assets(2,391)(2,006)(4,782)(4,012)
Prior Service Cost Amortization5056100112
Net Loss Amortization9189531,8371,906
Net Periodic Benefit Cost$1,713$2,128$3,427$4,256
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 June 30,Six Months Ended June 30,
(Dollars in Thousands)2018201720182017
Interest Cost$57$48$113$96
Net Loss Amortization406149813298
Net Periodic Benefit Cost$463$197$926$394
Discount Rate3.53%3.92%3.53%3.92%