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Computation of Earnings Per Common Share (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Computation of earnings per common share
 
Three Months Ended 
 March 31

2018
 
2017
Average number of common shares outstanding for basic calculation
7,873,948

 
7,827,143

Average potential effect of common shares in the Directors Plan (1)
199,270

 
191,533

Average number of common shares outstanding used to calculate diluted earnings per common share
8,073,218

 
8,018,676

Net income
$
3,462

 
$
3,136

Earnings per common share
 
 
 
Basic
$
0.44

 
$
0.40

Diluted
$
0.43

 
$
0.39

(1) 
Exclusive of shares held in the Rabbi Trust