Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2009	$ 165,662	$ 136,316	$ 29,613	$ (267)
Balance, shares at Dec. 31, 2009		18,393,773
Net income	5,092		5,092
Other comprehensive income, net of tax	1,474			1,474
Comprehensive Income	6,566
Stock issuance	38	38
Stock issuance, shares		4,952
Stock options exercised and related tax benefit	115	115
Stock options exercised and related tax benefit, shares	16,408	16,407
Net share-based compensation	593	593
Cash dividends	(736)		(736)
Balance at Dec. 31, 2010	172,238	137,062	33,969	1,207
Balance, shares at Dec. 31, 2010		18,415,132
Net income	5,341		5,341
Other comprehensive income, net of tax	2,347			2,347
Comprehensive Income	7,688
Stock issuance	56	56
Stock issuance, shares		5,952
Stock options exercised and related tax benefit	103	103
Stock options exercised and related tax benefit, shares	14,000	14,000
Net share-based compensation	623	623
Cash dividends	(1,842)		(1,842)
Balance at Dec. 31, 2011	178,866	137,844	37,468	3,554
Balance, shares at Dec. 31, 2011		18,435,084
Net income	12,653		12,653
Other comprehensive income, net of tax	2,277			2,277
Comprehensive Income	14,930
Stock issuance	70	70
Stock issuance, shares		7,987
Stock options exercised and related tax benefit	78	78
Stock options exercised and related tax benefit, shares		10,666
Stock options exercised	130	130
Stock options exercised and related tax benefit, shares	28,999	18,333
Shares exchanged in payment of option exercise consideration	(129)	(129)
Shares exchanged in payment of option exercise consideration, shares		(14,166)
Stock repurchased	(5,676)	(5,676)
Stock repurchased, shares		(641,637)
Net share-based compensation	700	700
Net share-based compensation, shares		18,821
Cash dividends	(5,588)		(5,588)
Balance at Dec. 31, 2012	$ 183,381	$ 133,017	$ 44,533	$ 5,831
Balance, shares at Dec. 31, 2012		17,835,088