Segments (Schedule of Financial Information by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010
Net interest income	$ 158,630	$ 159,437	$ 484,313		$ 485,255
Provision for loan losses	(11,395)	(21,844)	(39,372)		(78,353)
Non-interest Income	101,632	100,010	298,882		294,657
Investment securities gains (losses), net	2,587	16	5,870	[1]	(2,989)	[1]
Non-interest expense	(153,746)	(155,586)	(461,219)		(467,103)
Income before income taxes	97,708	82,033	288,474		231,467
Material intersegment revenues	0	0	0		0
Number of operating segments	3		3
Consumer Segment [Member]
Net interest income	69,972	75,101	213,580		236,578
Provision for loan losses	(10,827)	(17,554)	(36,158)		(54,545)
Non-interest Income	35,850	38,679	102,657		112,576
Non-interest expense	(64,829)	(73,452)	(203,215)		(221,189)
Income before income taxes	30,166	22,774	76,864		73,420
Commercial Segment [Member]
Net interest income	72,007	68,462	209,686		196,133
Provision for loan losses	(3,445)	(3,448)	(11,942)		(19,569)
Non-interest Income	41,757	38,015	121,212		112,366
Non-interest expense	(56,574)	(55,817)	(165,767)		(165,232)
Income before income taxes	53,745	47,212	153,189		123,698
Wealth Segment [Member]
Net interest income	9,725	9,462	28,962		28,274
Provision for loan losses	(583)	(817)	(611)		(1,038)
Non-interest Income	25,296	23,570	76,711		69,292
Non-interest expense	(21,238)	(21,290)	(66,552)		(64,567)
Income before income taxes	13,200	10,925	38,510		31,961
Segment Totals [Member]
Net interest income	151,704	153,025	452,228		460,985
Provision for loan losses	(14,855)	(21,819)	(48,711)		(75,152)
Non-interest Income	102,903	100,264	300,580		294,234
Non-interest expense	(142,641)	(150,559)	(435,534)		(450,988)
Income before income taxes	97,111	80,911	268,563		229,079
Other/ Elimination [Member]
Net interest income	6,926	6,412	32,085		24,270
Provision for loan losses	3,460	(25)	9,339		(3,201)
Non-interest Income	(1,271)	(254)	(1,698)		423
Investment securities gains (losses), net	2,587	16	5,870		(2,989)
Non-interest expense	(11,105)	(5,027)	(25,685)		(16,115)
Income before income taxes	$ 597	$ 1,122	$ 19,911		$ 2,388

[1] Available for sale and non-marketable securities