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, 2015	$ 4,659	$ 38,778	$ 78,517	$ (3,722)	$ (6,856)	$ 111,376
Net income			4,288			4,288
Other comprehensive income				1,366		1,366
Cash dividends declared			(1,715)			(1,715)
Acquisition of 15,521 shares of treasury stock					(350)	(350)
Treasury shares issued under employee stock option/purchase plans		1			278	279
Treasury shares issued under dividend reinvestment plan		82			3	85
Common stock issued under dividend reinvestment plan, 25,230 shares	25	527				552
Common stock issued under incentive stock option plan, 500 shares	1	8				9
Stock option compensation expense		58				58
Balance at Jun. 30, 2016	4,685	39,454	81,090	(2,356)	(6,925)	115,948
Balance at Dec. 31, 2016	4,688	39,752	83,081	(4,215)	(6,813)	116,493
Net income			6,362			6,362
Other comprehensive income				673		673
Cash dividends declared			(1,945)			(1,945)
Treasury shares issued under employee stock option/purchase plans		26			116	142
Treasury shares issued under dividend reinvestment plan		211			317	528
Stock option compensation expense		107				107
Balance at Jun. 30, 2017	$ 4,688	$ 40,096	$ 87,498	$ (3,542)	$ (6,380)	$ 122,360