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]
Shareholders' Equity Attributable to Parent Beginning Balance 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	4,112	0	0	0	0	4,112	0
Change in fair value of available for sale securities, net of tax	958	0	0	0	0	0	958
Reclassification adjustment for realized gain on sale of securities included in net income, net of tax	(112)	0	0	0	0	0	(112)
Reclassification of cash flow hedge, net of tax	(28)	0	0	0	0	0	(28)
Total comprehensive income	4,930
Cash dividends paid on common shares, $0.525 per share	(783)	0	0	0	0	(783)	0
Cash dividends paid on preferred stock	(438)	0	0	0	0	(438)	0
Preferred stock accretion of discount	0	188	0	0	0	(188)	0
Issuance under equity compensation plans, net	611	0	0	0	611	0	0
Share-based compensation	374	0	0	0	374	0	0
Excess tax expense (benefit) related to equity compensation plans	6	0	0	0	6	0	0
Shareholders' Equity Attributable to Parent Ending Balance at Mar. 31, 2011	184,501	32,707	150	(1,743)	134,664	18,478	245
Shareholders' Equity Attributable to Parent Beginning Balance at Dec. 31, 2011	239,565	33,293	178	(1,743)	169,138	35,097	3,602
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,185	0	0	0	0	6,185	0
Change in fair value of available for sale securities, net of tax	1,796	0	0	0	0	0	1,796
Reclassification adjustment for realized gain on sale of securities included in net income, net of tax	(654)	0	0	0	0	0	(654)
Reclassification of cash flow hedge, net of tax	0
Total comprehensive income	7,327
Cash dividends paid on common shares, $0.525 per share	(934)	0	0	0	0	(934)	0
Cash dividends paid on preferred stock	(438)	0	0	0	0	(438)	0
Preferred stock accretion of discount	0	203	0	0	0	(203)	0
Issuance under equity compensation plans, net	253	0	1	0	252	0	0
Share-based compensation	243	0	0	0	243	0	0
Shareholders' Equity Attributable to Parent Ending Balance at Mar. 31, 2012	$ 246,016	$ 33,496	$ 179	$ (1,743)	$ 169,633	$ 39,707	$ 4,744