Condensed Consolidated Statements of Changes In Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2009	$ 200,649	$ 79,508	$ 118,863	$ 2,278
Beginning balance, shares at Dec. 31, 2009		15,787,753
Comprehensive income:
Net income	2,879		2,879
Change in net unrealized gain (loss) on securities available for sale, net	1,328			1,328
Total comprehensive income	4,207
Stock option vesting	534	534
Stock options exercised, shares		146,403
Stock options exercised	1,229	1,229
Tax benefit of stock options exercised	390	390
Repurchase of common stock, shares		(74,018)
Repurchase of common stock	(1,364)	(373)	(991)
Dividend paid ($0.27 per share and $0.31 per share for 2011, 2010 respectively)	(4,917)		(4,917)
Ending balance at Sep. 30, 2010	200,728	81,288	115,834	3,606
Ending balance, shares at Sep. 30, 2010		15,860,138
Beginning balance at Dec. 31, 2010	200,397	81,554	117,533	1,310
Beginning balance, shares at Dec. 31, 2010	15,860,138	15,860,138
Comprehensive income:
Net income	12,041		12,041
Change in net unrealized gain (loss) on securities available for sale, net	2,158			2,158
Total comprehensive income	14,199
Stock option vesting	553	553
Stock options exercised, shares		296,250
Stock options exercised	2,428	2,428
Tax benefit of stock options exercised	296	296
Repurchase of common stock, shares		(177,430)
Repurchase of common stock	(2,745)	(915)	(1,830)
Dividend paid ($0.27 per share and $0.31 per share for 2011, 2010 respectively)	(4,304)		(4,304)
Ending balance at Sep. 30, 2011	$ 210,824	$ 83,916	$ 123,440	$ 3,468
Ending balance, shares at Sep. 30, 2011	15,978,958	15,978,958