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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
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 June 30,
 
Six Months Ended June 30,
(dollars in thousands)
2015
 
2014
 
2015
 
2014
Components of Net Periodic Pension Cost

 

 

 

Service cost—benefits earned during the period
$
672

 
$
631

 
$
1,344

 
$
1,262

Interest cost on projected benefit obligation
1,100

 
1,106

 
2,200

 
2,212

Expected return on plan assets
(1,807
)
 
(1,735
)
 
(3,614
)
 
(3,470
)
Amortization of prior service (credit) cost
(35
)
 
(35
)
 
(70
)
 
(70
)
Recognized net actuarial loss
468

 
209

 
936

 
418

Net Periodic Pension Expense
$
398

 
$
176

 
$
796

 
$
352