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Earnings Per Common Share (EPS) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Shares used in calculation of diluted EPS        
Weighted average common shares outstanding 2,018,466 2,018,753 2,018,609 2,018,544
Dilutive effect of stock options   80    
Weighted average common and common equivalent shares outstanding 2,018,466 2,018,833 2,018,609 2,018,544
Dilutive effect        
Based on the Company's net income position, dilutive effect of stock options (in shares) 18,168   2,250 4,750
Based on the Company's net income position, dilutive effect of stock options, weighted average exercise price (in dollars per share) $ 13.81   $ 8.91 $ 10.59
Stock Options.        
Dilutive effect        
Anti-dilutive securities (in shares)   11,418    
Weighted average exercise price of options, anti-dilutive (in dollars per share)   $ 15.99    
Based on the Company's net income position, anti-dilutive securities (in shares)     15,918 11,418
Based on the Company's net income position, anti-dilutive securities, weighted average exercise price (in dollars per share)     $ 14.51 $ 15.99