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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings per share basic and diluted [Abstract]        
Net income applicable to common stock $ 3,468 $ 3,031 $ 6,771 $ 6,314
Basic earnings per share computation [Abstract]        
Weighted average common shares outstanding (in shares) 3,480,122 3,508,818 3,479,653 3,515,477
Earnings per share - basic (in dollars per share) $ 1.00 $ 0.86 $ 1.95 $ 1.80
Diluted earnings per share computation [Abstract]        
Weighted average common shares outstanding for basic earnings per share (in shares) 3,480,122 3,508,818 3,479,653 3,515,477
Add: Dilutive effects of restricted stock (in shares) 1,188 409 610 205
Weighted average common shares outstanding for dilutive earnings per share (in shares) 3,481,310 3,509,227 3,480,263 3,515,682
Earnings per share - diluted (in dollars per share) $ 1.00 $ 0.86 $ 1.95 $ 1.80
Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive restricted stock excluded from net income per share calculations (in shares) 1,562,000 4,521,000 4,921,000 4,521,000
Restricted Stock [Member] | Minimum [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive stock share price range (in dollars per share) $ 49.87 $ 46.69 $ 47.81 $ 46.69
Restricted Stock [Member] | Maximum [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive stock share price range (in dollars per share) $ 53.15 $ 53.15 $ 53.15 $ 53.15