Condensed Consolidated Statement of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance (Restated) at Dec. 31, 2009	$ 163,912	$ 31,802	$ 130	$ (1,743)	$ 117,000	$ 15,790	$ 933
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	587	0	0	0	0	587	0
Change in fair value of available for sale securities, net of tax	2,091	0	0	0	0	0	2,091
Reclassification adjustment for realized gain on sale of securities included in net income, net of tax	(772)	0	0	0	0	0	(772)
Reclassification of cash flow hedge, net of tax	(119)	0	0	0	0	0	(119)
Total comprehensive income	1,787
Cash dividends paid on common shares, $0.1575 per share	(2,341)	0	0	0	0	(2,341)	0
Cash dividends paid on preferred stock	(1,312)	0	0	0	0	(1,312)	0
Preferred stock accretion of discount	0	533	0	0	0	(533)	0
Issuance under equity compensation plans, net	365	0	0	0	365	0	0
Issuance under stock offering	14,882	0	19	0	14,863	0	0
Share-based compensation	1,440	0	0	0	1,440	0	0
Excess tax expense (benefit) related to equity compensation plans	(260)	0	0	0	(260)	0	0
Ending Balance (Restated) at Sep. 30, 2010	178,473	32,335	149	(1,743)	133,408	12,191	2,133
Beginning Balance (Restated) at Dec. 31, 2010	179,801	32,519	150	(1,743)	133,673	15,775	(573)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	18,217	0	0	0	0	18,217	0
Change in fair value of available for sale securities, net of tax	6,302	0	0	0	0	0	6,302
Reclassification adjustment for realized gain on sale of securities included in net income, net of tax	(926)	0	0	0	0	0	(926)
Reclassification of cash flow hedge, net of tax	(85)	0	0	0	0	0	(85)
Total comprehensive income	23,508
Cash dividends paid on common shares, $0.1575 per share	(2,644)	0	0	0	0	(2,644)	0
Cash dividends paid on preferred stock	(1,313)	0	0	0	0	(1,313)	0
Preferred stock accretion of discount	0	575	0	0	0	(575)	0
Issuance under equity compensation plans, net	1,369	0	1	0	1,368	0	0
Issuance under stock offering	32,608		27	0	32,581	0	0
Share-based compensation	1,120	0	0	0	1,120	0	0
Excess tax expense (benefit) related to equity compensation plans	22	0	0	0	22	0	0
Ending Balance (Restated) at Sep. 30, 2011	$ 234,471	$ 33,094	$ 178	$ (1,743)	$ 168,764	$ 29,460	$ 4,718