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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 31, 2015
Jan. 09, 2009
Income (Numerator) [Abstract]                          
Net income as reported $ 5,086 $ 4,982 $ 4,883 $ 4,637 $ 4,320 $ 4,562 $ 4,624 $ 4,503 $ 19,588 $ 18,009 $ 16,206    
Basic EPS: Income available to common shareholders                 19,588 18,009 16,206    
Diluted EPS: Income available to common shareholders plus assumed conversions                 $ 19,588 $ 18,009 $ 16,206    
Shares (Denominator) [Abstract]                          
Weighted average number of common shares outstanding (in shares)                 10,747,306 10,713,290 10,674,755    
Incremental shares (in shares)                 71,712 116,512 90,114    
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)                 10,819,018 10,829,802 10,764,869    
Per-Share Amount [Abstract]                          
Basic EPS: Income available to common shareholders (in dollars per share) $ 0.48 $ 0.46 $ 0.45 $ 0.43 $ 0.40 $ 0.43 $ 0.43 $ 0.42 $ 1.82 $ 1.68 $ 1.52    
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share) $ 0.47 $ 0.46 $ 0.45 $ 0.43 $ 0.39 $ 0.42 $ 0.43 $ 0.42 $ 1.81 $ 1.66 $ 1.51    
Warrants issued to private parties                     226,819 226,819 225,904
Total Dilutive Securities                     226,819    
In-the-Money                          
Per-Share Amount [Abstract]                          
Warrants issued to private parties                     226,819    
Total Dilutive Securities                     226,819    
Out-of-the-Money                          
Per-Share Amount [Abstract]                          
Warrants issued to private parties                     0    
Total Dilutive Securities                     0