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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2019
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,
 
 
 
2019
 
 
2018
 
 
 
(In Thousands, except per share data)
 
Basic Earnings Per Share:
 
 
 
 
 
 
Net income available to common shareholders
 
$
11,482
 
 
$
11,737
 
Less: Income allocated to participating securities
 
 
9
 
 
 
3
 
Net income allocated to common shareholders
 
 
11,473
 
 
 
11,734
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding Including participating securities
 
 
20,030
 
 
 
20,352
 
Less: Participating securities
 
 
16
 
 
 
22
 
Average common shares
 
 
20,014
 
 
 
20,330
 
 
 
 
 
 
 
 
 
 
Basic earnings per common share
 
$
0.57
 
 
$
0.58
 
 
 
 
 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
 
 
 
Net income allocated to common shareholders
 
$
11,473
 
 
$
11,734
 
Weighted average common shares outstanding for basic earnings per common share
 
 
20,014
 
 
 
20,330
 
Add: Dilutive effects of stock options
 
 
81
 
 
 
108
 
Average shares and dilutive potential common shares
 
 
20,095
 
 
 
20,438
 
 
 
 
 
 
 
 
 
 
Diluted earnings per common share
 
$
0.57
 
 
$
0.57
 
 
Share and per share data in above table has been adjusted for a 2-for-1 stock split on July 12, 2018.
 
Shares subject to issue upon exercise of options of 3,376 in 2019 and 7,000 in 2018 were excluded from the diluted earnings per common share calculation as they were anti-dilutive.