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Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net Earnings        
Basic Earnings Per Share $ 5,307,000 $ 3,390,000 $ 11,976,000 $ 12,126,000
Effect Of Dilutive Securities: Restricted Stock Units 0 0 0 0
Effect Of Dilutive Securities: Shares Held In Deferred Comp Plan 0 0 0 0
Diluted Earnings Per Share $ 5,307,000 $ 3,390,000 $ 11,976,000 $ 12,126,000
Weighted Average Number Of Shares        
Basic Earnings Per Share (in Shares) 5,473,443 5,544,596 5,484,063 5,601,879
Effect Of Dilutive Securities: Restricted Stock Units (in Shares) 17,188 14,690 15,090 13,190
Effect Of Dilutive Securities: Shares Held In Deferred Comp Plan 166,937 159,797 165,041 158,039
Diluted Earnings Per Share (in Shares) 5,657,568 5,719,083 5,664,194 5,773,108
Per Share Amount        
Basic Earnings Per Share $ 0.96 $ 0.61 $ 2.18 $ 2.16
Diluted Earnings Per Share $ 0.93 $ 0.59 $ 2.11 $ 2.10