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Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Defined Benefit Plans [Abstract]  
Schedule of Net Periodic Benefit Costs [Table Text Block]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended March 31,

(Dollars in thousands)

Pension Benefits

 

Other Benefits

 

2013

 

2012

 

2013

 

2012

Service cost

$
8 

 

$
6 

 

$
4 

 

$
5 

Interest cost

 
11 

 

 
12 

 

 
9 

 

 
9 

Amortization of prior service cost

 
5 

 

 
5 

 

 

 -

 

 

 -

       Net periodic benefit cost

$
24 

 

$
23 

 

$
13 

 

$
14