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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic                      
NET INCOME $ 9,134 $ 8,250 $ 6,379 $ 5,077 $ 3,817 $ 3,595 $ 2,416 $ 3,299 $ 28,840 $ 13,127 $ 16,757
Undistributed earnings allocated to participating securities                 (330) (195) (383)
Net income allocated to common shares                 $ 28,510 $ 12,932 $ 16,374
Weighted average common shares outstanding (shares)                 15,087,686 15,196,351 15,741,926
Basic earnings per common share (in dollars per share) $ 0.60 $ 0.54 $ 0.42 $ 0.33 $ 0.25 $ 0.23 $ 0.16 $ 0.21 $ 1.89 $ 0.85 $ 1.04
Diluted                      
Net income allocated to common shares                 $ 28,510 $ 12,932 $ 16,374
Weighted average common shares outstanding for basic earnings per common share (shares)                 15,087,686 15,196,351 15,741,926
Add: Dilutive effects of assumed exercises of stock options                 67,661 27,537 193,388
Average shares and dilutive potential common shares (shares)                 15,155,347 15,223,888 15,935,314
Diluted earnings per common share (in dollars per share) $ 0.59 $ 0.54 $ 0.42 $ 0.33 $ 0.25 $ 0.23 $ 0.16 $ 0.21 $ 1.88 $ 0.85 $ 1.03