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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2019
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)
2019
 
2018
 
2019
 
2018
Components of Net Periodic Pension Cost
 

 
 

 
 
 
 
 
 
Interest cost on projected benefit obligation
 
$
989

 
 
$
967

 
 
$
1,978

 
 
$
1,934

Expected return on plan assets
 
(1,181
)
 
 
(1,567
)
 
 
(2,361
)
 
 
(3,134
)
Net amortization
 
395

 
 
545

 
 
789

 
 
1,089

Net Periodic Pension Expense
 
$
203

 
 
$
(55
)
 
 
$
406

 
 
$
(111
)