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Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of calculations of basic and diluted earnings per common share
    Three Months Ended September 30,     Nine Months Ended September 30,  
(dollars in thousands, except per share data)   2018     2017     2018     2017  
Basic earnings per share:                                
Net income available to shareholders   $ 3,098     $ 1,766     $ 8,095     $ 5,786  
Average shares outstanding     6,023,269       6,057,399       6,024,317       6,066,253  
Basic earnings per share   $ 0.51     $ 0.29     $ 1.34     $ 0.95  
Diluted earnings per share:                                
Net income available to shareholders   $ 3,098     $ 1,766     $ 8,095     $ 5,786  
Average shares outstanding     6,023,269       6,057,399       6,024,317       6,066,253  
Effect of dilutive stock options     6,363       5,784       6,480       5,407  
Average shares outstanding including dilutive stock options     6,029,632       6,063,183       6,030,797       6,071,660  
Diluted earnings per share   $ 0.51       0.29     $ 1.34       0.95