Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Capital Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2011	$ 9,051	$ 24,696	$ 88,014	$ 7,024	$ (10,535)	$ 118,250
Net income			12,466			12,466
Total other comprehensive income				673		673
Dividend declared:
Common stock			(4,565)			(4,565)
Purchase of treasury stock					(181)	(181)
Stock options exercised, including related tax effects		35	(228)		1,380	1,187
Recognition of stock based compensation expense		216				216
Restricted stock grants		(41)			41
Balance at Dec. 31, 2012	9,051	24,906	95,687	7,697	(9,295)	128,046
Net income			13,183			13,183
Total other comprehensive income				(15,637)		(15,637)
Dividend declared:
Common stock			(4,915)			(4,915)
Purchase of treasury stock					(24)	(24)
Stock options exercised, including related tax effects		19	(49)		491	461
Recognition of stock based compensation expense		264	1			265
Restricted stock grants		(104)			104
Balance at Dec. 31, 2013	9,051	25,085	103,907	(7,940)	(8,724)	121,379
Net income			14,613			14,613
Total other comprehensive income				14,631		14,631
Dividend declared:
Common stock			(5,362)			(5,362)
Purchase of treasury stock					(8)	(8)
Stock options exercised, including related tax effects		43	(9)		582	616
Three-for-two stock split	4,526	(4,526)
Recognition of stock based compensation expense		418				418
Restricted stock grants		(115)			115
Balance at Dec. 31, 2014	$ 13,577	$ 20,905	$ 113,149	$ 6,691	$ (8,035)	$ 146,287