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Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of calculations of basic and diluted earnings (loss) per share
    Three Months Ended September 30,     Nine Months Ended September 30,  
(dollars in thousands, except per share data)   2017     2016     2017     2016  
Basic earnings per share:                                
Net income available to shareholders   $ 1,766     $ 1,884     $ 5,786     $ 5,294  
Basic earnings per share   $ 0.30     $ 0.32     $ 0.99     $ 0.90  
Diluted earnings per share:                                
Net income available to shareholders   $ 1,766     $ 1,884     $ 5,786     $ 5,294  
Average shares outstanding     5,825,825       5,859,415       5,834,679       5,869,569  
Effect of dilutive stock options     5,561       0       5,198       0  
Average shares outstanding including dilutive stock options     5,831,386       5,859,415       5,839,877       5,869,569  
Diluted earnings per share   $ 0.30     $ 0.32     $ 0.99     $ 0.90