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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31,
(dollars in thousands)
2018
 
2017
Components of Net Periodic Pension Cost

 

Service cost—benefits earned during the period
$
—

 
$
—

Interest cost on projected benefit obligation
967

 
1,025

Expected return on plan assets
(1,567
)
 
(1,582
)
Amortization of prior service credit
544

 
474

Recognized net actuarial loss
—

 
—

Net Periodic Pension Expense
$
(56
)
 
$
(83
)