Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2013	$ 4,561	$ 36,636	$ 65,897	$ (4,696)	$ (7,010)	$ 95,388
Net income			8,402			8,402
Other comprehensive income				1,596		1,596
Cash dividends declared			(2,847)			(2,847)
Treasury shares issued under employer stock option/purchase plans		(9)			68	59
Common stock issued under dividend reinvestment plan	46	877				923
Balance at Dec. 31, 2014	4,607	37,504	71,452	(3,100)	(6,942)	103,521
Net income			10,204			10,204
Other comprehensive income				(622)		(622)
Cash dividends declared			(3,139)			(3,139)
Treasury shares issued under employer stock option/purchase plans		6			86	92
Common stock issued under dividend reinvestment plan	52	1,194				1,246
Stock option compensation expense		74				74
Balance at Dec. 31, 2015	4,659	38,778	78,517	(3,722)	(6,856)	111,376
Net income			8,087			8,087
Other comprehensive income				(493)		(493)
Cash dividends declared			(3,523)			(3,523)
Acquisition of 34,048 shares of treasury stock					(795)	(795)
Treasury shares issued under employer stock option/purchase plans		4			16	20
Treasury shares issued under dividend reinvestment plan, 45,068 shares		296			822	1,118
Common stock issued under dividend reinvestment plan	25	528				553
Common stock issued under incentive stock option plan, 3,800 shares	4	58				62
Stock option compensation expense		88				88
Balance at Dec. 31, 2016	$ 4,688	$ 39,752	$ 83,081	$ (4,215)	$ (6,813)	$ 116,493