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Retirement Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost (Income)
Components of net periodic benefit cost (income) were as follows: 
 
Three Months Ended March 31,
 
2017
 
2016
 
2017
 
2016
(Dollars in thousands)
Retirement Plans
 
Other Post Retirement
Benefits
Service cost
$
151

 
$
171

 
$
12

 
$
12

Interest cost
465

 
518

 
29

 
33

Expected return on plan assets
(753
)
 
(754
)
 
—

 
—

Amortization of net actuarial loss
288

 
323

 
11

 
6

Accretion of prior service cost
(70
)
 
(71
)
 
—

 
—

Net periodic benefit cost
$
81

 
$
187

 
$
52

 
$
51