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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (Numerator) [Abstract]                      
Net income as reported $ 6,363 $ 5,933 $ 5,734 $ 5,506 $ 5,086 $ 4,982 $ 4,883 $ 4,637 $ 23,536 $ 19,588 $ 18,009
Basic EPS: Income available to common shareholders                 23,536 19,588 18,009
Diluted EPS: Income available to common shareholders plus assumed conversions                 $ 23,536 $ 19,588 $ 18,009
Shares (Denominator) [Abstract]                      
Weighted average number of common shares outstanding (in shares)                 10,783,419 10,747,306 10,713,290
Incremental shares (in shares)                 69,055 71,712 116,512
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)                 10,852,474 10,819,018 10,829,802
Per-Share Amount [Abstract]                      
Basic EPS: Income available to common shareholders (in dollars per share) $ 0.59 $ 0.55 $ 0.53 $ 0.51 $ 0.48 $ 0.46 $ 0.45 $ 0.43 $ 2.18 $ 1.82 $ 1.68
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share) $ 0.58 $ 0.55 $ 0.53 $ 0.51 $ 0.47 $ 0.46 $ 0.45 $ 0.43 $ 2.17 $ 1.81 $ 1.66