Condensed Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Parent [Member]	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2011		$ 239,565	$ 33,293	$ 178	$ (1,743)	$ 169,138	$ 35,097	$ 3,602
Net Income (Loss) Available to Common Stockholders, Basic	5,544	6,185	0	0	0	0	6,185	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,185
Change in fair value of available for sale securities, net of tax	1,796
Reclassification adjustment for realized gain on sale of securities included in net income, net of tax	(654)
Total comprehensive income	7,327	1,142	0	0	0	0	0	1,142
Cash dividends paid on common shares, $0.1575 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
Balance at Mar. 31, 2012		246,016	33,496	179	(1,743)	169,633	39,707	4,744
Balance at Dec. 31, 2012	235,745	235,745	0	181	(1,743)	173,299	56,218	7,790
Net Income (Loss) Available to Common Stockholders, Basic	10,040	10,040	0	0	0	0	10,040	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,040
Change in fair value of available for sale securities, net of tax	(1,822)
Reclassification adjustment for realized gain on sale of securities included in net income, net of tax	(417)
Total comprehensive income	7,801	(2,239)	0	0	0	0	0	(2,239)
Cash dividends paid on common shares, $0.1575 per share		(948)	0	0	0	0	(948)	0
Repurchase of common stock warrants		(1,006)	0	0	0	(1,006)	0	0
Issuance under equity compensation plans, net		1,324	0	1	0	1,323	0	0
Share-based compensation		778	0	0	0	778	0	0
Excess tax benefit related to equity compensation plans		10	0	0	0	10	0	0
Balance at Mar. 31, 2013	$ 243,704	$ 243,704	$ 0	$ 182	$ (1,743)	$ 174,404	$ 65,310	$ 5,551