Consolidated Condensed Statements of Changes in Shareholders' Equity (USD $) In Thousands	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance, value at Dec. 31, 2009	$ 74,301	$ 348,706	$ 93,316	$ 11,816	$ 528,139
Balance, shares at Dec. 31, 2009	77	28,129
Comprehensive Income
Net income			12,972		12,972
Other comprehensive income, net of tax:
Net unrealized gain from securities, net of reclassification adjustments				7,128	7,128
Net change in cash flow hedging instruments				(727)	(727)
Net pension plan liability adjustment				37	37
Other comprehensive income					6,438
Comprehensive income					19,410
Accretion of preferred stock discount	294		(294)		0
Issuance of common stock, net of offering costs, value		229,129			229,129
Issuance of common stock, net of offering costs, shares		11,040
Issuance of common stock - stock option and other plans, value		521			521
Issuance of common stock - stock option and other plans, shares		42
Issuance of common stock - restricted stock awards, net of cancelled awards, value		705			705
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		93
Tax benefit deficiency associated with share-based compensation		(12)			(12)
Preferred dividends			(1,922)		(1,922)
Cash dividends paid on common stock			(675)		(675)
Balance, value at Jun. 30, 2010	74,595	579,049	103,397	18,254	775,295
Balance, shares at Jun. 30, 2010	77	39,304
Balance, value at Dec. 31, 2010	0	576,905	117,692	12,281	706,878
Balance, shares at Dec. 31, 2010	0	39,338
Comprehensive Income
Net income			14,411		14,411
Other comprehensive income, net of tax:
Net unrealized gain from securities, net of reclassification adjustments				8,780	8,780
Net change in cash flow hedging instruments				(143)	(143)
Net pension plan liability adjustment				(233)	(233)
Other comprehensive income					8,404
Comprehensive income					22,815
Issuance of common stock - stock option and other plans, value		410			410
Issuance of common stock - stock option and other plans, shares		25
Issuance of common stock - restricted stock awards, net of cancelled awards, value		763			763
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		114
Repurchase of shares, shares		(2)
Repurchase of shares, value		(32)			(32)
Cash dividends paid on common stock			(3,154)		(3,154)
Balance, value at Jun. 30, 2011	$ 0	$ 578,046	$ 128,949	$ 20,685	$ 727,680
Balance, shares at Jun. 30, 2011	0	39,475