Segments (Schedule Of Financial Information By Segment) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]
Segment Reporting Information, Intersegment Revenue			$ 0		$ 0
Number of operating segments			3		3
Net interest income	154,716,000	154,706,000	468,275,000		464,507,000
Provision for loan losses	(7,652,000)	(4,146,000)	(24,867,000)		(14,810,000)
Non-interest income	112,286,000	106,311,000	323,676,000		308,864,000
Investment securities gains (losses), net	2,995,000	650,000	10,474,000	[1]	(3,083,000)	[1]
Non-interest expense	(162,186,000)	(156,312,000)	(487,457,000)		(468,315,000)
Income before income taxes	100,159,000	101,209,000	290,101,000		287,163,000
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	67,836,000	67,162,000	202,430,000		201,277,000
Provision for loan losses	(8,353,000)	(8,656,000)	(25,896,000)		(25,537,000)
Non-interest income	29,390,000	29,512,000	83,745,000		84,396,000
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(66,763,000)	(66,946,000)	(200,553,000)		(203,811,000)
Income before income taxes	22,110,000	21,072,000	59,726,000		56,325,000
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	72,040,000	70,371,000	214,574,000		206,483,000
Provision for loan losses	863,000	2,112,000	803,000		1,984,000
Non-interest income	47,708,000	47,500,000	142,367,000		137,111,000
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(62,894,000)	(57,006,000)	(185,886,000)		(174,998,000)
Income before income taxes	57,717,000	62,977,000	171,858,000		170,580,000
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	9,805,000	9,971,000	29,735,000		30,083,000
Provision for loan losses	(29,000)	(33,000)	463,000		(173,000)
Non-interest income	33,360,000	29,053,000	94,846,000		87,632,000
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(23,769,000)	(23,686,000)	(72,453,000)		(71,643,000)
Income before income taxes	19,367,000	15,305,000	52,591,000		45,899,000
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	149,681,000	147,504,000	446,739,000		437,843,000
Provision for loan losses	(7,519,000)	(6,577,000)	(24,630,000)		(23,726,000)
Non-interest income	110,458,000	106,065,000	320,958,000		309,139,000
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(153,426,000)	(147,638,000)	(458,892,000)		(450,452,000)
Income before income taxes	99,194,000	99,354,000	284,175,000		272,804,000
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	5,035,000	7,202,000	21,536,000		26,664,000
Provision for loan losses	(133,000)	2,431,000	(237,000)		8,916,000
Non-interest income	1,828,000	246,000	2,718,000		(275,000)
Investment securities gains (losses), net	2,995,000	650,000	10,474,000		(3,083,000)
Non-interest expense	(8,760,000)	(8,674,000)	(28,565,000)		(17,863,000)
Income before income taxes	$ 965,000	$ 1,855,000	$ 5,926,000		$ 14,359,000

[1] Available for sale and non-marketable securities