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Computation of Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 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 
 September 30
 
Nine Months Ended 
 September 30

2019
 
2018
 
2019
 
2018
Average number of common shares outstanding for basic calculation
7,925,332

 
7,851,448

 
7,904,568

 
7,876,941

Average potential effect of common shares in the Directors Plan (1)
181,536

 
200,597

 
186,720

 
199,488

Average number of common shares outstanding used to calculate diluted earnings per common share
8,106,868

 
8,052,045

 
8,091,288

 
8,076,429

Net income
$
4,442

 
$
3,696

 
$
12,126

 
$
10,491

Earnings per common share
 
 
 
 
 
 
 
Basic
$
0.56

 
$
0.47

 
$
1.53

 
$
1.33

Diluted
$
0.55

 
$
0.46

 
$
1.50

 
$
1.30

(1) 
Exclusive of shares held in the Rabbi Trust