Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands	Total	Preferred Stock	Common Stock	Common Stock Warrant	Capital Surplus	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Beginning Balance at Dec. 31, 2008	$ 937,843		$ 127,937		$ 94,802	$ (54,080)	$ 1,053,435	$ (284,251)
Net income	82,170						82,170
Cash dividends - preferred stock	(1,789)						(1,789)
Cash dividends - common stock ($0.77, $0.64 and $0.64 per share for the year 2009, 2010 and 2011, respectively)	(63,891)						(63,891)
Stock Dividend	0				5,765		(21,718)	15,953
Options exercised (156,445 and 48,365 shares for the year 2009 and 2010, respectively)	2,939				(1,022)			3,961
Nonvested (restricted) shares granted (554,258, 451,205 and 587,113 shares for the year 2009, 2010 and 2011, respectively)	(3)				(13,590)			13,587
Restricted stock activity (153,923, 174,793 and 152,818 shares for the year 2009, 2010 and 2011, respectively)	(1,758)				1,285			(3,043)
Deferred compensation trust (22,730, 8,779 and 19,154 increase in shares for the year 2009, 2010 and 2011, respectively)	0				(227)			227
Share-based compensation	7,429				7,429
Issuance of common stock (3,267,751 and 21,487,860 shares for the year 2009 and 2010, respectively)	79,526				(4,991)			84,517
Issuance Of Fixed-Rate Cumulative Perpetual Preferred Stock	124,565	120,622		4,582	(435)		(204)
Redemption of Fixed-Rate Cumulative Perpetual Preferred Stock	(125,000)	(120,622)					(4,378)
Repurchase of warrants	(5,025)			(4,582)	(443)
Net unrealized gains on investment securities, net of taxes	35,070					35,070
Unrealized hedging gain, net of taxes	(94)					(94)
Minimum pension liability adjustment, net of taxes	(6,355)					(6,355)
Ending Balance at Dec. 31, 2009	1,065,627	0	127,937	0	88,573	(25,459)	1,043,625	(169,049)
Net income	102,909						102,909
Cash dividends - common stock ($0.77, $0.64 and $0.64 per share for the year 2009, 2010 and 2011, respectively)	(65,634)						(65,634)
Options exercised (156,445 and 48,365 shares for the year 2009 and 2010, respectively)	826				(330)			1,156
Nonvested (restricted) shares granted (554,258, 451,205 and 587,113 shares for the year 2009, 2010 and 2011, respectively)	0				(10,973)			10,973
Restricted stock activity (153,923, 174,793 and 152,818 shares for the year 2009, 2010 and 2011, respectively)	(2,634)				1,227			(3,861)
Deferred compensation trust (22,730, 8,779 and 19,154 increase in shares for the year 2009, 2010 and 2011, respectively)	0				(195)			195
Share-based compensation	7,247				7,247
Issuance of common stock (3,267,751 and 21,487,860 shares for the year 2009 and 2010, respectively)	400,018				400,018
Net unrealized gains on investment securities, net of taxes	(1,111)					(1,111)
Unrealized hedging gain, net of taxes	0
Minimum pension liability adjustment, net of taxes	467					467
Ending Balance at Dec. 31, 2010	1,507,715	0	127,937	0	485,567	(26,103)	1,080,900	(160,586)
Net income	119,558						119,558
Cash dividends - common stock ($0.77, $0.64 and $0.64 per share for the year 2009, 2010 and 2011, respectively)	(69,255)						(69,255)
Nonvested (restricted) shares granted (554,258, 451,205 and 587,113 shares for the year 2009, 2010 and 2011, respectively)	0				(14,222)			14,222
Restricted stock activity (153,923, 174,793 and 152,818 shares for the year 2009, 2010 and 2011, respectively)	(2,295)				602			(2,897)
Deferred compensation trust (22,730, 8,779 and 19,154 increase in shares for the year 2009, 2010 and 2011, respectively)	0				(79)			79
Share-based compensation	8,014				8,014			0
Net unrealized gains on investment securities, net of taxes	19,002					19,002
Minimum pension liability adjustment, net of taxes	(16,786)					(16,786)
Ending Balance at Dec. 31, 2011	$ 1,565,953	$ 0	$ 127,937	$ 0	$ 479,882	$ (23,887)	$ 1,131,203	$ (149,182)