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Retirement Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2015
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,
 
2015
 
2014
 
2015
 
2014
(Dollars in thousands)
Retirement Plans
 
Other Post Retirement
Benefits
Service cost
$
193

 
$
136

 
$
15

 
$
19

Interest cost
488

 
475

 
28

 
36

Expected return on plan assets
(756
)
 
(745
)
 
—

 
—

Amortization of net actuarial loss
328

 
161

 
13

 
3

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

 
(5
)
Net periodic benefit cost (income)
$
183

 
$
(43
)
 
$
56

 
$
53