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Earnings per Share (Tables)
6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of calculations of basic and diluted earnings per common share
    Three Months Ended June 30,     Six Months Ended June 30,  
(dollars in thousands, except per share data)   2018     2017     2018     2017  
Basic earnings per share:                                
Net income available to shareholders   $ 2,907     $ 1,919     $ 4,997     $ 4,020  
Average shares outstanding     6,021,038       6,070,080       6,024,851       6,070,749  
Basic earnings per share   $ 0.48     $ 0.32     $ 0.83     $ 0.66  
                                 
Diluted earnings per share:                                
Net income available to shareholders   $ 2,907     $ 1,919     $ 4,997     $ 4,020  
Average shares outstanding     6,021,038       6,070,080       6,024,851       6,070,749  
Effect of dilutive stock options     6,883       5,141       6,442       5,157  
Average shares outstanding including dilutive stock options     6,027,921       6,075,221       6,031,293       6,075,906  
Diluted earnings per share   $ 0.48       0.32     $ 0.83       0.66