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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Potentially dilutive securities outstanding			0	0
Average number of common shares outstanding	3,413,304	3,436,660	3,420,002	3,439,980
Average number of common shares outstanding used to calculate diluted earnings per share	3,413,304	3,436,660	3,420,002	3,439,980