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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of calculations of basic and diluted earnings (loss) per share
  Three Months Ended June 30,  Six Months Ended June 30, 
(dollars in thousands, except per share data) 2017  2016  2017  2016 
Basic earnings per share:                
Net income available to shareholders $1,919  $1,412  $4,020  $3,410 
Basic earnings per share $0.33  $0.24  $0.69  $0.58 
Diluted earnings per share:                
Net income available to shareholders $1,919  $1,412  $4,020  $3,410 
Average shares outstanding  5,838,506   5,871,208   5,839,175   5,874,706 
Effect of dilutive stock options  4,929   0   4,948   0 
Average shares outstanding including dilutive stock options  5,843,435   5,871,208   5,844,123   5,874,706 
Diluted earnings per share $0.33   0.24   0.69   0.58 
Schedule of outstanding shares of the common stock
  Number of shares 
  June 30,  December 31,  June 30, 
  2017  2016  2016 
Outstanding, beginning of year  5,616,607   5,441,190   5,441,190 
Issuance of stock:            
4% stock dividend  224,550   217,155   217,155 
Purchase of treasury stock  (4,715)  (41,738)  (15,301)
Outstanding, end of year  5,836,442   5,616,607   5,643,044