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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30,
 
Nine Months Ended September 30,
(dollars in thousands)
2018
 
2017
 
2018
 
2017
Components of Net Periodic Pension Cost
 

 
 

 
 

 
 

Interest cost on projected benefit obligation
 
$
978

 
 
$
1,025

 
 
$
2,912

 
 
$
3,075

Expected return on plan assets
 
(1,566
)
 
 
(1,582
)
 
 
(4,700
)
 
 
(4,746
)
Net amortization
 
512

 
 
475

 
 
1,601

 
 
1,424

Net Periodic Pension Expense
 
$
(76
)
 
 
$
(82
)
 
 
$
(187
)
 
 
$
(247
)