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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
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)
2016
 
2015
 
2016
 
2015
Components of Net Periodic Pension Cost

 

 

 

Service cost—benefits earned during the period
$
(6
)
 
$
606

 
$
469

 
$
1,951

Interest cost on projected benefit obligation
1,099

 
1,120

 
3,200

 
3,319

Expected return on plan assets
(1,444
)
 
(1,772
)
 
(4,337
)
 
(5,385
)
Amortization of prior service credit
29

 
(34
)
 
(41
)
 
(104
)
Recognized net actuarial loss
638

 
586

 
1,708

 
1,521

Net Periodic Pension Expense
$
316

 
$
506

 
$
999

 
$
1,302