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Earnings Per Common Share (Weighted Average Number Of Shares Used In Computing Earnings Per Share) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 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 3,433,387 3,409,689 3,430,131 3,423,387