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Employee Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2018
Retirement Benefits [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 June 30,
 
 
Six Months Ended June 30,
 
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
 
 
(Dollars in thousands)
 
Service cost
 
$
151
 
 
$
142
 
 
$
301
 
 
$
282
 
Interest cost
 
 
549
 
 
 
555
 
 
 
1,098
 
 
 
1,103
 
Expected return on plan assets
 
 
(646
)
 
 
(609
)
 
 
(1,292
)
 
 
(1,151
)
Net amortization and deferral
 
 
159
 
 
 
143
 
 
 
319
 
 
 
263
 
 Net periodic pension cost
 
$
213
 
 
$
231
 
 
$
426
 
 
$
497