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Note 6. Share-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Share-based compensation expense [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
 
Three Months Ended
June 30,

Six Months Ended
June 30,
(Dollars in thousands)
2014
 
2013

2014
 
2013
Salaries, wages and employee benefits
$
7,646

 
$
5,163

 
$
10,976

 
$
11,194

Deferred income tax benefit
(2,981
)
 
(2,010
)
 
(4,280
)
 
(4,357
)
Net share-based compensation expense
$
4,665

 
$
3,153

 
$
6,696

 
$
6,837