Segments (Schedule Of Financial Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Segment Reporting Information [Line Items]
Net interest income	$ 159,737		$ 160,973
Provision for loan losses	(8,165)		(15,789)
Non-interest income	94,583		95,906
Investment securities gains (losses), net	4,040	[1]	1,327	[1]
Non-interest expense	(150,461)		(153,960)
Income before income taxes	99,734		88,457
Number of operating segments	3
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	69,093		70,948
Provision for loan losses	(9,307)		(13,637)
Non-interest income	27,188		31,994
Non-interest expense	(66,136)		(69,512)
Income before income taxes	20,838		19,793
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	71,629		68,831
Provision for loan losses	(1,831)		(5,118)
Non-interest income	42,894		39,146
Non-interest expense	(55,949)		(56,836)
Income before income taxes	56,743		46,023
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	9,757		9,549
Provision for loan losses	(42)		(28)
Non-interest income	26,155		25,186
Non-interest expense	(22,763)		(22,314)
Income before income taxes	13,107		12,393
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	150,479		149,328
Provision for loan losses	(11,180)		(18,783)
Non-interest income	96,237		96,326
Non-interest expense	(144,848)		(148,662)
Income before income taxes	90,688		78,209
Other/ Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	9,258		11,645
Provision for loan losses	3,015		2,994
Non-interest income	(1,654)		(420)
Investment securities gains (losses), net	4,040		1,327
Non-interest expense	(5,613)		(5,298)
Income before income taxes	$ 9,046		$ 10,248

[1] Available for sale and non-marketable securities