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Earnings Per Comon Share (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Earnings Per Share
 
Quarterly Period Ended:
 
Year-to-Date Period Ended:
 
9/30/2012
 
9/30/2011
 
9/30/2012
 
9/30/2011
Earnings Per Share - Basic:
 
 
 
 
 
 
 
Net Income
$
5,748

 
$
5,372

 
$
16,630

 
$
16,502

Weighted Average Shares - Basic
12,012

 
11,989

 
12,004

 
11,954

Earnings Per Share - Basic
$
0.48

 
$
0.45

 
$
1.39

 
$
1.38

 
 
 
 
 
 
 
 
Earnings Per Share - Diluted:
 
 
 
 
 
 
 
Net Income
$
5,748

 
$
5,372

 
$
16,630

 
$
16,502

Weighted Average Shares - Basic
12,012

 
11,989

 
12,004

 
11,954

Dilutive Average Shares Attributable to Stock Options
20

 
22

 
18

 
28

Weighted Average Shares - Diluted
$
12,032

 
$
12,011

 
$
12,022

 
$
11,982

Earnings Per Share - Diluted
$
0.48

 
$
0.45

 
$
1.38

 
$
1.38

Antidilutive Shares Excluded from the Calculation
of Earnings Per Share
129

 
215

 
203

 
139