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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,925,332	7,851,448	7,904,568	7,876,941
Average potential effect of common shares in the Directors Plan	[1]	181,536	200,597	186,720	199,488
Average number of common shares outstanding used to calculate diluted earnings per common share		8,106,868	8,052,045	8,091,288	8,076,429
Net income		$ 4,442	$ 3,696	$ 12,126	$ 10,491
Basic (in dollars per share)		$ 0.56	$ 0.47	$ 1.53	$ 1.33
Diluted (in dollars per share)		$ 0.55	$ 0.46	$ 1.50	$ 1.30
[1] Exclusive of shares held in the Rabbi Trust

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