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Earnings Per Comon Share (Tables)
 6 Months Ended
Jun. 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:
 
6/30/2012
 
6/30/2011
 
6/30/2012
 
6/30/2011
Earnings Per Share - Basic:
 
 
 
 
 
 
 
Net Income
$
5,594

 
$
5,849

 
$
10,882

 
$
11,130

Weighted Average Shares - Basic
11,759

 
11,729

 
11,765

 
11,702

Earnings Per Share - Basic
$
0.48

 
$
0.50

 
$
0.92

 
$
0.95

 
 
 
 
 
 
 
 
Earnings Per Share - Diluted:
 
 
 
 
 
 
 
Net Income
$
5,594

 
$
5,849

 
$
10,882

 
$
11,130

Weighted Average Shares - Basic
11,759

 
11,729

 
11,765

 
11,702

Dilutive Average Shares Attributable to Stock Options
14

 
12

 
19

 
17

Weighted Average Shares - Diluted
$
11,773

 
$
11,741

 
$
11,784

 
$
11,719

Earnings Per Share - Diluted
$
0.48

 
$
0.50

 
$
0.92

 
$
0.95

Antidilutive Shares Excluded from the Calculation
of Earnings Per Share
205

 
132

 
205

 
132