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, 2014	$ 4,607	$ 37,504	$ 71,452	$ (3,100)	$ (6,942)	$ 103,521
Net income			7,937			7,937
Other comprehensive income				24		24
Cash dividends declared			(2,330)			(2,330)
Treasury shares issued under employer stock option/purchase plans		6			86	92
Common stock issued under dividend reinvestment plan	36	833				869
Balance at Sep. 30, 2015	4,643	38,343	77,059	(3,076)	(6,856)	110,113
Balance at Dec. 31, 2015	4,659	38,778	78,517	(3,722)	(6,856)	111,376
Net income			6,363			6,363
Other comprehensive income				1,175		1,175
Cash dividends declared			(2,618)			(2,618)
Acquisition of 30,196 shares of treasury stock					(700)	(700)
Treasury shares issued under employer stock option/purchase plans		2			10	12
Treasury shares issued under dividend reinvestment plan, 24,171 shares		134			438	572
Common stock issued under dividend reinvestment plan	25	527				552
Common stock issued under incentive stock option plan, 3,600 shares	4	55				59
Stock option compensation expense		88				88
Balance at Sep. 30, 2016	$ 4,688	$ 39,584	$ 82,262	$ (2,547)	$ (7,108)	$ 116,879