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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the reconciliation from basic to diluted average common shares and the calculations of net income per common share. Net income for basic and diluted calculations does not differ.
(in thousands, except per share amounts)
2017
 
2016
 
2015
 
 
 
 
 
 
Net income
$
44,315

 
$
40,045

 
$
43,209

 
 
 
 
 
 
Average common shares:
 

 
 

 
 

Basic (weighted-average outstanding shares)
11,549

 
11,434

 
11,349

Dilutive potential common shares from stock options
133

 
131

 
133

 
Diluted (weighted-average outstanding shares)
11,682

 
11,565

 
11,482

 
 
 
 
 
 
Basic earnings per share
$
3.84

 
$
3.50

 
$
3.81

 
 
 
 
 
 
Diluted earnings per share
$
3.79

 
$
3.46

 
$
3.76