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Computation of Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Computation of earnings per common share
Earnings per common share have been computed based on the following for the:
 
Three Months Ended 
 June 30
 
Six Months Ended 
 June 30

2019
 
2018
 
2019
 
2018
Average number of common shares outstanding for basic calculation
7,910,512

 
7,912,374

 
7,895,610

 
7,887,961

Average potential effect of common shares in the Directors Plan (1)
179,364

 
173,222

 
189,355

 
186,174

Average number of common shares outstanding used to calculate diluted earnings per common share
8,089,876

 
8,085,596

 
8,084,965

 
8,074,135

Net income
$
4,188

 
$
3,333

 
$
7,684

 
$
6,795

Earnings per common share
 
 
 
 
 
 
 
Basic
$
0.53

 
$
0.42

 
$
0.97

 
$
0.86

Diluted
$
0.52

 
$
0.41

 
$
0.95

 
$
0.84

(1) 
Exclusive of shares held in the Rabbi Trust