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Employee Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2018
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The components of the Company’s net periodic pension cost were as follows:
 
 
 
Three Months Ended March 31,
 
 
 
2018
 
2017
 
 
 
(Dollars in thousands)
 
Service cost
 
$
151
 
$
140
 
Interest cost
 
 
549
 
 
548
 
Expected return on plan assets
 
 
(646)
 
 
(542)
 
Net amortization and deferral
 
 
159
 
 
120
 
Net periodic pension cost
 
$
213
 
$
266