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Earnings per Share (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of calculations of basic and diluted earnings per common share
    Three Months Ended March 31,  
(dollars in thousands, except per share data)   2018     2017  
Basic earnings per share:            
Net income available to shareholders   $ 2,090     $ 2,100  
Basic earnings per share   $ 0.36     $ 0.36  
Diluted earnings per share:                
Net income available to shareholders   $ 2,090     $ 2,100  
Average shares outstanding     5,797,134       5,839,850  
Effect of dilutive stock options     5,720       4,916  
Average shares outstanding including dilutive stock options     5,802,854       5,844,766  
Diluted earnings per share   $ 0.36       0.36