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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per common share:
 
 
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(In Thousands, Except Per Share Amounts)
 
Basic Earnings Per Share:
 
 
 
 
 
 
 
 
 
 
Net income available to common shareholders
 
$
32,268
 
$
28,843
 
$
26,423
 
Less: Income allocated to participating securities
 
 
5
 
 
39
 
 
8
 
Net income allocated to common shareholders
 
 
32,263
 
 
28,804
 
 
26,415
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
  Including participating securities
 
 
9,975
 
 
8,980
 
 
9,221
 
Less: Participating securities
 
 
9
 
 
11
 
 
11
 
Average common shares
 
 
9,966
 
 
8,969
 
 
9,210
 
 
 
 
 
 
 
 
 
 
 
 
Basic earnings per common share
 
$
3.23
 
$
3.21
 
$
2.87
 
 
 
 
 
 
 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
 
 
 
 
 
Net income allocated to common shareholders
 
$
32,263
 
$
28,804
 
$
26,415
 
Weighted average common shares outstanding
  for basic earnings per common share
 
 
9,966
 
 
8,969
 
 
9,210
 
Add: Dilutive effects of stock options
 
 
62
 
 
66
 
 
87
 
Add: Dilutive effects of warrants
 
 
-
 
 
-
 
 
75
 
Average shares and dilutive potential common shares
 
 
10,028
 
 
9,035
 
 
9,371
 
 
 
 
 
 
 
 
 
 
 
 
Diluted earnings per common share
 
$
3.22
 
$
3.19
 
$
2.82