Condensed Consolidated Statements of Shareholders' Equity (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Preferred stock [Member]	Common stock [Member]	Retained earnings [Member]	Accumulated other comprehensive income [Member]	Total
Balance at Dec. 31, 2010	$ 25,334	$ 85,264	$ 71,307	$ 193	$ 182,098
Balance (in shares) at Dec. 31, 2010		15,321
Comprehensive income:
Net income		0	8,088	0	8,088
Other comprehensive income		0	0	616	616
Redemption of preferred stock issued to U.S. Treasury	(26,380)	0	0	0	(26,380)
Repurchase of warrant issued to U.S. Treasury		(1,625)	0	0	(1,625)
Preferred stock dividends and accretion	1,046	0	(1,084)	0	(38)
Cash dividends on common stock		0	(1,531)	0	(1,531)
Stock-based compensation expense		331	0	0	331
Issuance of common stock under stock plans		7	0	0	7
Issuance of common stock under stock plans (in shares)		23
Tax benefit associated with stock awards		5	0	0	5
Balance at Jun. 30, 2011		83,982	76,780	809	161,571
Balance (in shares) at Jun. 30, 2011		15,344
Balance at Dec. 31, 2011		84,564	83,107	3,149	170,820
Balance (in shares) at Dec. 31, 2011		15,398			15,398,197
Comprehensive income:
Net income		0	7,620	0	7,620
Other comprehensive income		0	0	785	785
Cash dividends on common stock		0	(4,009)	0	(4,009)
Stock-based compensation expense		335	0	0	335
Issuance of common stock under stock plans		182	0	0	182
Issuance of common stock under stock plans (in shares)		48
Tax benefit associated with stock awards		20	0	0	20
Balance at Jun. 30, 2012		$ 85,101	$ 86,718	$ 3,934	$ 175,753
Balance (in shares) at Jun. 30, 2012		15,446			15,446,221