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EMPLOYEE BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
Three Months Ended March 31,
(Dollars in Thousands)20202019
Service Cost$1,457$1,529
Interest Cost1,4111,545
Expected Return on Plan Assets(2,748)(2,382)
Prior Service Cost Amortization44
Net Loss Amortization1,011965
Special Termination Charge61-
Net Periodic Benefit Cost$1,196$1,661
Discount Rate Used for Benefit Cost3.53%4.43%
Long-term Rate of Return on Assets7.00%7.25%
Supplemental Executive Retirement Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
The components of the net periodic benefit cost for the Company's SERP were as follows:
Three Months Ended March 31,
(Dollars in Thousands)20202019
Interest Cost$72$87
Net Loss Amortization247190
Net Periodic Benefit Cost$319$277
Discount Rate Used for Benefit Cost3.16%4.23%