Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]	Total
Balance at Dec. 31, 2010	$ 2,056,672	$ 4,163,619	$ 889,284	$ (461,296)	$ (1,065)	$ 6,647,214
Balance (in shares) at Dec. 31, 2010		182,784,086
Net income (loss) for the period			52,817		(226)	52,591
Other comprehensive income (loss)				(37,867)		(37,867)
Subordinated debt converted to preferred stock	100,454	(14,605)				85,849
Issuance of common stock		25,048				25,048
Issuance of common stock (in shares)		1,067,540
Net activity under employee plans and related tax benefits		4,307				4,307
Net activity under employee plans and related tax benefits (in shares)		2,860
Dividends on preferred stock	5,273		(38,050)			(32,777)
Dividends on common stock, $0.01 per share			(1,824)			(1,824)
Change in deferred compensation			2,020			2,020
Other changes in noncontrolling interests					26	26
Balance at Mar. 31, 2011	2,162,399	4,178,369	904,247	(499,163)	(1,265)	6,744,587
Balance (in shares) at Mar. 31, 2011		183,854,486
Balance at Dec. 31, 2011	2,377,560	4,163,242	1,036,590	(592,084)	(2,080)	6,983,228
Balance (in shares) at Dec. 31, 2011		184,135,388				184,135,388
Net income (loss) for the period			89,676		(273)	89,403
Other comprehensive income (loss)				20,517		20,517
Preferred stock redemption	(700,000)					(700,000)
Subordinated debt converted to preferred stock	34,839	(5,065)				29,774
Net activity under employee plans and related tax benefits		4,345				4,345
Net activity under employee plans and related tax benefits (in shares)		92,790
Dividends on preferred stock	25,234		(64,187)			(38,953)
Dividends on common stock, $0.01 per share			(1,843)			(1,843)
Change in deferred compensation			289			289
Other changes in noncontrolling interests					18	18
Balance at Mar. 31, 2012	$ 1,737,633	$ 4,162,522	$ 1,060,525	$ (571,567)	$ (2,335)	$ 6,386,778
Balance (in shares) at Mar. 31, 2012		184,228,178				184,228,178