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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,851,448	7,848,317	7,876,941	7,839,172
Average potential effect of common shares in the Directors Plan	[1]	200,597	192,572	199,488	191,548
Average number of common shares outstanding used to calculate diluted earnings per common share		8,052,045	8,040,889	8,076,429	8,030,720
Net income		$ 3,696	$ 3,536	$ 10,491	$ 10,516
Basic (in dollars per share)		$ 0.47	$ 0.45	$ 1.33	$ 1.34
Diluted (in dollars per share)		$ 0.46	$ 0.44	$ 1.30	$ 1.31
[1] Exclusive of shares held in the Rabbi Trust

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