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Computation of Earnings Per Common Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,909,794	7,872,077	7,841,451
Average potential effect of common shares in the Directors Plan	[1]	185,248	200,771	192,286
Average number of common shares outstanding used to calculate diluted earnings per common share		8,095,042	8,072,848	8,033,737
NET INCOME		$ 13,024	$ 14,021	$ 13,237
Basic (in dollars per share)		$ 1.65	$ 1.78	$ 1.69
Diluted (in dollars per share)		$ 1.61	$ 1.74	$ 1.65
[1] Exclusive of shares held in the Rabbi Trust

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