Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total USD ($)		Common Shares Outstanding	Accumulated Other Comprehensive (Loss) Income USD ($)	Common Stock USD ($)	Additional Paid-in Capital USD ($)	Retained Earnings USD ($)	Treasury Stock USD ($)
Beginning balance at Dec. 31, 2011	$ 272,979			$ (6,101)	$ 91,332	$ 58,495	$ 157,566	$ (28,313)
Beginning balance, shares at Dec. 31, 2011			16,702,376
Net income	5,263						5,263
Other comprehensive loss, net of income tax benefit	(486)			(486)
Cash dividends declared ($0.20 per share)	(3,349)						(3,349)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	941						(58)	999
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares			59,347
Repurchase of cancelled restricted stock awards						300	(87)	(213)
Repurchase of cancelled restricted stock awards, shares			(13,125)
Stock-based compensation	865					840	25
Net tax deficiency on stock-based compensation	(77)					(77)
Purchases of treasury stock	(611)							(611)
Purchases of treasury stock, shares			(39,339)
Restricted stock awards granted						(1,154)	(134)	1,288
Restricted stock awards granted, shares			71,157
Ending balance at Mar. 31, 2012	275,525			(6,587)	91,332	58,404	159,226	(26,850)
Ending balance, shares at Mar. 31, 2012			16,780,416
Beginning balance at Dec. 31, 2012	284,277	[1]		(6,920)	91,332	62,101	164,823	(27,059)
Beginning balance, shares at Dec. 31, 2012			16,770,232
Net income	5,398						5,398
Other comprehensive loss, net of income tax benefit	(779)			(779)
Cash dividends declared ($0.20 per share)	(3,358)						(3,358)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	837						(32)	869
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares			48,907
Repurchase of cancelled restricted stock awards						519		(519)
Repurchase of cancelled restricted stock awards, shares			(29,533)
Stock-based compensation	77					77
Net tax deficiency on stock-based compensation	(11)					(11)
Purchases of treasury stock	(1,657)							(1,657)
Purchases of treasury stock, shares			(96,952)
Restricted stock awards granted						(1,174)	(92)	1,266
Restricted stock awards granted, shares			70,041
Ending balance at Mar. 31, 2013	$ 284,784			$ (7,699)	$ 91,332	$ 61,512	$ 166,739	$ (27,100)
Ending balance, shares at Mar. 31, 2013			16,762,695

[1] Note: The consolidated balance sheet at December 31, 2012 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U. S. generally accepted accounting principles for complete financial statements. See accompanying notes to the unaudited consolidated financial statements.