Condensed Consolidated Statements of Shareholders' Equity and Comprehensive Income (unaudited) (USD $) In Thousands, except Share data	Total	Preferred stock [Member]	Common stock [Member]	Retained earnings [Member]	Accumulated other comprehensive income [Member]
Balance at Dec. 31, 2009	$ 159,521	$ 24,995	$ 84,814	$ 49,463	$ 249
Balance (shares) at Dec. 31, 2009			15,298
Net income	5,490	0	0	5,490	0
Net change in unrealized gain (net of tax expense)	1,053	0	0	0	1,053
Total comprehensive income	6,543
Preferred stock dividend and accretion	(660)	169	0	(829)	0
Cash dividends on common stock	(840)	0	0	(840)	0
Stock-based compensation expense	138	0	138	0	0
Issuance of common stock under stock plans(shares)			11
Issuance of common stock under stock plans	16	0	16	0	0
Tax benefit associated with stock awards	4	0	4	0	0
Balance at Jun. 30, 2010	164,722	25,164	84,972	53,284	1,302
Balance (shares) at Jun. 30, 2010			15,309
Balance at Dec. 31, 2010	181,646	25,334	85,264	71,307	(259)
Balance (shares) at Dec. 31, 2010	15,321,227		15,321
Net income	8,088	0	0	8,088	0
Net change in unrealized gain (net of tax expense)	787	0	0	0	787
Total comprehensive income	8,875
Redemption of preferred stock issued to U.S. Treasury	(26,380)	(26,380)	0	0	0
Repurchase of warrant issued to U.S. Treasury	(1,625)	0	(1,625)	0	0
Preferred stock dividend and accretion	(38)	1,046	0	(1,084)	0
Cash dividends on common stock	(1,531)	0	0	(1,531)	0
Stock-based compensation expense	331	0	331	0	0
Issuance of common stock under stock plans(shares)			23
Issuance of common stock under stock plans	7	0	7	0	0
Tax benefit associated with stock awards	5	0	5	0	0
Balance at Jun. 30, 2011	$ 161,290	$ 0	$ 83,982	$ 76,780	$ 528
Balance (shares) at Jun. 30, 2011	15,343,760		15,344