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Computation of Earnings Per Common Share
 9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Computation of Earnings Per Common Share Computation of Earnings Per Common Share
Basic earnings per common share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes additional common shares that would have been outstanding if dilutive potential common shares had been issued. Potential common shares that may be issued relate solely to outstanding shares in the Directors Plan.
Earnings per common share have been computed based on the following for the:
 Three Months Ended 
 September 30		Nine Months Ended 
 September 30
2020201920202019
Average number of common shares outstanding for basic calculation7,966,811 7,925,332 7,945,762 7,904,568 
Average potential effect of common shares in the Directors Plan (1)
144,472 181,536 151,040 186,720 
Average number of common shares outstanding used to calculate diluted earnings per common share8,111,283 8,106,868 8,096,802 8,091,288 
Net income$4,357 $4,442 $11,608 $12,126 
Earnings per common share
Basic$0.55 $0.56 $1.46 $1.53 
Diluted$0.54 $0.55 $1.43 $1.50 
(1)Exclusive of shares held in the Rabbi Trust