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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		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,924,318	7,910,512	7,927,298	7,895,610
Average potential effect of common shares in the Directors Plan	[1]	144,430	179,364	154,177	189,355
Average number of common shares outstanding used to calculate diluted earnings per common share		8,068,748	8,089,876	8,081,475	8,084,965
Net income		$ 4,187	$ 4,188	$ 7,251	$ 7,684
Basic (in dollars per share)		$ 0.53	$ 0.53	$ 0.91	$ 0.97
Diluted (in dollars per share)		$ 0.52	$ 0.52	$ 0.90	$ 0.95
[1] Exclusive of shares held in the Rabbi Trust

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