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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income (Numerator) [Abstract]                      
Net income as reported $ 6,970 $ 7,095 $ 6,569 $ 6,495 $ 6,686 $ 6,288 $ 6,395 $ 6,156 $ 27,129 $ 25,525 $ 23,536
Basic EPS: Income available to common shareholders                 27,129 25,525 23,536
Diluted EPS: Income available to common shareholders plus assumed conversions                 $ 27,129 $ 25,525 $ 23,536
Shares (Denominator) [Abstract]                      
Basic EPS: Income available to common shareholders (in shares)                 10,858,606 10,815,718 10,783,419
Effect of dilutive securities: restricted stock (in shares)                 74,212 73,591 69,055
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)                 10,932,818 10,889,309 10,852,474
Per-Share Amount [Abstract]                      
Basic EPS: Income available to common shareholders (in dollars per share) $ 0.64 $ 0.65 $ 0.61 $ 0.60 $ 0.62 $ 0.58 $ 0.59 $ 0.57 $ 2.50 $ 2.36 $ 2.18
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share) $ 0.63 $ 0.65 $ 0.60 $ 0.60 $ 0.60 $ 0.58 $ 0.59 $ 0.57 $ 2.48 $ 2.34 $ 2.17