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Summary of Significant Accounting Policies (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
Net Earnings Available to Common Shareholders                      
Net earnings                 $ 15,133 $ 11,357 $ 14,067
Effect of dilutive securities: Restricted stock units                 0 0 0
Diluted earnings per common share                 $ 15,133 $ 11,357 $ 14,067
Common Shares                      
Basic earnings per common share (in shares)                 5,576,099 5,657,025 5,799,505
Effect of dilutive securities: Restricted stock units (in shares)                 13,935 14,203 25,438
Shares held in deferred comp plan                 158,831 150,394 141,542
Diluted earnings per common share (in shares)                 5,748,865 5,821,622 5,966,485
Per Share Amount                      
Basic earnings per common share (in dollars per share) $ 0.55 $ 0.61 $ 0.82 $ 0.73 $ 0.34 $ 0.80 $ 0.46 $ 0.41 $ 2.71 $ 2.01 $ 2.43
Diluted earnings per common share (in dollars per share) $ 0.53 $ 0.59 $ 0.80 $ 0.71 $ 0.33 $ 0.78 $ 0.44 $ 0.40 $ 2.63 $ 1.95 $ 2.36