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Employee Benefits (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit
The following table summarizes the components of net periodic pension cost for the periods presented:
 Three Months Ended June 30,Six Months Ended June 30,
(dollars in thousands)2020201920202019
Components of Net Periodic Pension Cost
Interest cost on projected benefit obligation$890  $989  $1,781  $1,978  
Expected return on plan assets(971) (1,181) (1,943) (2,361) 
Net amortization385  395  769  789  
Net Periodic Pension Expense$304  $203  $607  $406