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Retirement Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
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,
 
2016
 
2015
 
2016
 
2015
(Dollars in thousands)
Retirement Plans
 
Other Post Retirement
Benefits
Service cost
$
171

 
$
193

 
$
12

 
$
15

Interest cost
518

 
488

 
33

 
28

Expected return on plan assets
(754
)
 
(756
)
 
—

 
—

Amortization of net actuarial loss
323

 
328

 
6

 
13

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

 
—

Net periodic benefit cost
$
187

 
$
183

 
$
51

 
$
56