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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, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,873,948	7,827,143
Average potential effect of common shares in the Directors Plan	[1]	199,270	191,533
Average number of common shares outstanding used to calculate diluted earnings per common share		8,073,218	8,018,676
Net income		$ 3,462	$ 3,136
Basic (in dollars per share)		$ 0.44	$ 0.40
Diluted (in dollars per share)		$ 0.43	$ 0.39
[1] Exclusive of shares held in the Rabbi Trust

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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