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Earnings per Share - Components (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
Basic earnings per share:                      
Net income available to shareholders $ 5,183 $ 4,960 $ 3,282 $ 868 $ 4,068 $ 3,860 $ 3,520 $ 4,666 $ 14,293 $ 16,114 $ 10,714
Average shares outstanding                 6,489,799 6,525,684 6,518,772
Basic earnings per share (in dollars per share) $ 0.80 $ 0.77 $ 0.50 $ 0.13 $ 0.62 $ 0.59 $ 0.54 $ 0.72 $ 2.20 $ 2.47 $ 1.64
Diluted earnings per share:                      
Net income available to shareholders $ 5,183 $ 4,960 $ 3,282 $ 868 $ 4,068 $ 3,860 $ 3,520 $ 4,666 $ 14,293 $ 16,114 $ 10,714
Average shares outstanding                 6,489,799 6,525,684 6,518,772
Effect of dilutive stock options                 0 0 5,454
Average shares outstanding including dilutive stock options                 6,489,799 6,525,684 6,524,226
Diluted earnings per share (in dollars per share) $ 0.80 $ 0.77 $ 0.50 $ 0.13 $ 0.62 $ 0.59 $ 0.54 $ 0.72 $ 2.20 $ 2.47 $ 1.64