Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2010	$ 6,647,214	$ 2,056,672	$ 4,163,619	$ 889,284	$ (461,296)	$ (1,065)
Balance (in shares) at Dec. 31, 2010			182,784,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	322,690			323,804		(1,114)
Other comprehensive income (loss)	(130,788)				(130,788)
Stock Issued During Period, Value, New Issues	25,500		25,048
Subordinated debt converted to preferred stock	256,109	299,248	(43,139)
Stock Issued During Period, Shares, New Issues	1,100,000		1,067,540
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			283,762
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	17,714		17,714
Dividends on preferred stock	(148,774)	21,640		(170,414)
Dividends on common stock, $0.13 per share	(7,361)			(7,361)
Increase (Decrease) in Deferred Compensation	1,277			1,277
Other changes in noncontrolling interests	99					99
Balance at Dec. 31, 2011	6,983,228	2,377,560	4,163,242	1,036,590	(592,084)	(2,080)
Balance (in shares) at Dec. 31, 2011			184,135,388
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	348,150			349,516		(1,366)
Other comprehensive income (loss)	145,927				145,927
Stock Issued During Period, Value, New Issues	141,342	143,750	(2,408)
Preferred stock redemption	1,542,500	1,542,500	(3,830)	3,830
Subordinated debt converted to preferred stock	89,564	104,796	(15,232)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			63,810
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	16,677		16,677
Dividends on preferred stock	(126,189)	44,696		(170,885)
Dividends on common stock, $0.13 per share	(7,392)			(7,392)
Increase (Decrease) in Deferred Compensation	(184)			(184)
Other changes in noncontrolling interests	18
Balance at Dec. 31, 2012	6,048,641	1,128,302	4,166,109	1,203,815	(446,157)	(3,428)
Balance (in shares) at Dec. 31, 2012	184,199,198		184,199,198
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	263,455			263,791		(336)
Other comprehensive income (loss)	254,056				254,056
Stock Issued During Period, Value, New Issues	784,318	800,000	(15,682)
Preferred stock redemption	(799,468)	(925,748)	580	125,700
Subordinated debt converted to preferred stock	1,210	1,416	(206)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			478,498
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	32,389		32,389
Dividends on preferred stock	(95,512)			(95,512)
Dividends on common stock, $0.13 per share	(24,094)			(24,094)
Increase (Decrease) in Deferred Compensation	(30)			(30)
Other changes in noncontrolling interests	(402)		(4,166)			3,764
Balance at Dec. 31, 2013	$ 6,464,563	$ 1,003,970	$ 4,179,024	$ 1,473,670	$ (192,101)	$ 0
Balance (in shares) at Dec. 31, 2013	184,677,696		184,677,696