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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		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,966,811	7,925,332	7,945,762	7,904,568
Average potential effect of common shares in the Directors Plan	[1]	144,472	181,536	151,040	186,720
Average number of common shares outstanding used to calculate diluted earnings per common share		8,111,283	8,106,868	8,096,802	8,091,288
Net income		$ 4,357	$ 4,442	$ 11,608	$ 12,126
Basic (in dollars per share)		$ 0.55	$ 0.56	$ 1.46	$ 1.53
Diluted (in dollars per share)		$ 0.54	$ 0.55	$ 1.43	$ 1.50
[1] Exclusive of shares held in the Rabbi Trust

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