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Computation of Earnings Per Common Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,892,421	7,888,885
Average potential effect of common shares in the Directors Plan	[1]	163,186	199,456
Average number of common shares outstanding used to calculate diluted earnings per common share		8,055,607	8,088,341
Net income		$ 3,064	$ 3,496
Basic (in dollars per share)		$ 0.39	$ 0.44
Diluted (in dollars per share)		$ 0.38	$ 0.43
[1] Exclusive of shares held in the Rabbi Trust

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