Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2010	$ 205,995	$ 50,936	$ 150,730	$ 4,329
Beginning Balance (in shares) at Dec. 31, 2010		7,658,496
Net Income	26,177		26,177
Other comprehensive loss, net of tax	(2,268)			(2,268)
Stock-based compensation expense	1,025	1,025
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)		19,723
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	(134)	(134)
Common stock repurchased (in shares)		(13,244)
Common stock repurchased	(389)	(389)
Cash dividends declared ($1.08, $1.00 and $1.50 per share in 2013, 2012, and 2011, respectively)	(11,530)		(11,530)
Ending Balance at Dec. 31, 2011	218,876	51,438	165,377	2,061
Ending Balance (in shares) at Dec. 31, 2011		7,664,975
Net Income	23,428		23,428
Other comprehensive loss, net of tax	936			936
Stock-based compensation expense	538	538
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)		23,355
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	(212)	(212)
Common stock repurchased (in shares)		(65,580)
Common stock repurchased	(2,097)	(2,097)
Cash dividends declared ($1.08, $1.00 and $1.50 per share in 2013, 2012, and 2011, respectively)	(7,654)		(7,654)
Ending Balance at Dec. 31, 2012	233,815	49,667	181,151	2,997
Ending Balance (in shares) at Dec. 31, 2012		7,622,750
Net Income	22,783		22,783
Other comprehensive loss, net of tax	(15,344)			(15,344)
Stock-based compensation expense	596	596
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)		25,308
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	300	300
Common stock repurchased (in shares)		(68,145)
Common stock repurchased	(2,780)	(2,780)
Cash dividends declared ($1.08, $1.00 and $1.50 per share in 2013, 2012, and 2011, respectively)	(8,274)		(8,274)
Ending Balance at Dec. 31, 2013	$ 231,096	$ 47,783	$ 195,660	$ (12,347)
Ending Balance (in shares) at Dec. 31, 2013		7,579,913