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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per share

(Dollars in thousands, except per share data)                  
    2016     2015     2014  
Basic                        
Net income   $ 6,090     $ 5,743     $ 5,695  
                         
Weighted average common shares outstanding     3,287,109       3,289,296       3,298,177  
                         
Basic earnings per common shares   $ 1.85     $ 1.75     $ 1.73  
                         
Diluted                        
Net income   $ 6,090     $ 5,743     $ 5,695  
                         
Weighted average common shares outstanding     3,287,109       3,289,296       3,298,177  
Plus dilutive stock options and restricted stock units     4,972       7,925       12,116  
                         
Weighted average common shares outstanding and potentially dilutive shares     3,292,081       3,297,221       3,310,293  
                         
Diluted earnings per common share   $ 1.85     $ 1.74     $ 1.72