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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2018
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:
 
 
 
Three Months Ended
March 31,
 
 
 
2018
 
2017
 
 
 
(In Thousands, except per
share data)
 
Basic Earnings Per Share:
 
 
 
 
 
 
 
Net income available to common shareholders
 
$
11,737
 
$
5,140
 
Less: Income allocated to participating securities
 
 
3
 
 
1
 
Net income allocated to common shareholders
 
 
11,734
 
 
5,139
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding Including participating securities
 
 
10,176
 
 
9,446
 
Less: Participating securities
 
 
11
 
 
5
 
Average common shares
 
 
10,165
 
 
9,441
 
 
 
 
 
 
 
 
 
Basic earnings per common share
 
$
1.15
 
$
0.54
 
 
 
 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
 
 
Net income allocated to common shareholders
 
$
11,734
 
$
5,139
 
Weighted average common shares outstanding for basic earnings per common share
 
 
10,165
 
 
9,441
 
Add: Dilutive effects of stock options
 
 
54
 
 
56
 
Average shares and dilutive potential common shares
 
 
10,219
 
 
9,497
 
 
 
 
 
 
 
 
 
Diluted earnings per common share
 
$
1.15
 
$
0.54