Segments (Schedule of Financial Information by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011		Jun. 30, 2010
Net interest income	$ 164,710	$ 163,108	$ 325,683		$ 325,818
Provision for loan losses	(12,188)	(22,187)	(27,977)		(56,509)
Non-interest Income	101,344	101,458	197,250		194,647
Investment securities gains (losses), net	1,956	660	3,283	[1]	(3,005)	[1]
Non-interest expense	(153,513)	(155,793)	(307,473)		(311,517)
Income before income taxes	102,309	87,246	190,766		149,434
Material intersegment revenues	0		0
Number of operating segments	3		3
Consumer Segment [Member]
Net interest income	72,086	80,444	143,608		161,477
Provision for loan losses	(11,694)	(17,713)	(25,331)		(36,991)
Non-interest Income	34,813	39,517	66,807		73,897
Non-interest expense	(68,559)	(73,908)	(138,386)		(147,737)
Income before income taxes	26,646	28,340	46,698		50,646
Commercial Segment [Member]
Net interest income	69,520	64,537	137,679		127,671
Provision for loan losses	(3,378)	(4,193)	(8,497)		(16,121)
Non-interest Income	40,309	39,044	79,455		74,351
Non-interest expense	(53,479)	(55,379)	(109,193)		(109,415)
Income before income taxes	52,972	44,009	99,444		76,486
Wealth Segment [Member]
Net interest income	9,688	9,799	19,237		18,812
Provision for loan losses		(163)	(28)		(221)
Non-interest Income	26,229	23,493	51,415		45,722
Non-interest expense	(23,099)	(21,466)	(45,314)		(43,277)
Income before income taxes	12,818	11,663	25,310		21,036
Segment Totals [Member]
Net interest income	151,294	154,780	300,524		307,960
Provision for loan losses	(15,072)	(22,069)	(33,856)		(53,333)
Non-interest Income	101,351	102,054	197,677		193,970
Non-interest expense	(145,137)	(150,753)	(292,893)		(300,429)
Income before income taxes	92,436	84,012	171,452		148,168
Other/ Elimination [Member]
Net interest income	13,416	8,328	25,159		17,858
Provision for loan losses	2,884	(118)	5,879		(3,176)
Non-interest Income	(7)	(596)	(427)		677
Investment securities gains (losses), net	1,956	660	3,283		(3,005)
Non-interest expense	(8,376)	(5,040)	(14,580)		(11,088)
Income before income taxes	$ 9,873	$ 3,234	$ 19,314		$ 1,266

[1] Available for sale and non-marketable securities