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Employee Benefits Employee Benefits (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
(dollars in thousands)
2016
 
2015
 
2016
 
2015
Components of Net Periodic Pension Cost

 

 

 

Service cost—benefits earned during the period
$
—

 
$
672

 
$
474

 
$
1,344

Interest cost on projected benefit obligation
1,036

 
1,100

 
2,101

 
2,200

Expected return on plan assets
(1,434
)
 
(1,807
)
 
(2,893
)
 
(3,614
)
Amortization of prior service credit
(35
)
 
(35
)
 
(70
)
 
(70
)
Recognized net actuarial loss
526

 
468

 
1,070

 
936

Net Periodic Pension Expense
$
93

 
$
398

 
$
682

 
$
796