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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [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)
2017
 
2016
 
2017
 
2016
Components of Net Periodic Pension Cost

 

 

 

Service cost—benefits earned during the period
$
—

 
$
—

 
$
—

 
$
474

Interest cost on projected benefit obligation
1,025

 
1,036

 
2,050

 
2,101

Expected return on plan assets
(1,582
)
 
(1,434
)
 
(3,164
)
 
(2,893
)
Amortization of prior service credit
475

 
(35
)
 
949

 
(70
)
Recognized net actuarial loss
—

 
526

 
—

 
1,070

Net Periodic Pension Expense
$
(82
)
 
$
93

 
$
(165
)
 
$
682