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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,819,080	7,779,365	7,807,187	7,776,413
Average potential effect of common shares in the Directors Plan	[1]	183,842	176,690	184,152	176,845
Average number of common shares outstanding used to calculate diluted earnings per common share		8,002,922	7,956,055	7,991,339	7,953,258
Net income		$ 3,407	$ 4,098	$ 6,424	$ 7,771
Basic (in dollars per share)		$ 0.44	$ 0.53	$ 0.82	$ 1.00
Diluted (in dollars per share)		$ 0.43	$ 0.52	$ 0.80	$ 0.98

[1] Exclusive of shares held in the Rabbi Trust