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Computation of Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Computation of earnings per common share
 
Three Months Ended 
 June 30
 
Six Months Ended 
 June 30

2016
 
2015
 
2016
 
2015
Average number of common shares outstanding for basic calculation
7,819,080

 
7,779,365

 
7,807,187

 
7,776,413

Average potential effect of common shares in the Directors Plan (1)
183,842

 
176,690

 
184,152

 
176,845

Average number of common shares outstanding used to calculate diluted earnings per common share
8,002,922

 
7,956,055

 
7,991,339

 
7,953,258

Net income
$
3,407

 
$
4,098

 
$
6,424

 
$
7,771

Earnings per common share
 
 
 
 
 
 
 
Basic
$
0.44

 
$
0.53

 
$
0.82

 
$
1.00

Diluted
$
0.43

 
$
0.52

 
$
0.80

 
$
0.98

(1) 
Exclusive of shares held in the Rabbi Trust