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Earnings Per Common Share (Weighted Average Number Of Shares Used In Computing Earnings Per Share) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Potentially dilutive securities outstanding     0 0
Average number of common shares outstanding used to calculate basic and diluted earnings per share 3,448,352 3,413,304 3,436,271 3,420,002