Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 182,591	$ 171,243	$ 543,671		$ 506,847
Provision for loan losses	(10,704)	(7,263)	(32,590)		(25,918)
Non-interest income	122,242	119,319	362,392		354,913
Investment securities gains (losses), net	(3,037)	(1,965)	(2,158)	[1]	(3,704)	[1]
Non-interest expense	(184,572)	(181,242)	(555,996)		(535,804)
Income before income taxes	106,520	100,092	315,319		296,334
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	70,793	67,375	207,421		201,166
Provision for loan losses	(11,067)	(9,033)	(31,531)		(26,533)
Non-interest income	35,194	34,230	101,211		97,165
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(72,607)	(70,134)	(217,733)		(209,660)
Income before income taxes	22,313	22,438	59,368		62,138
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	82,012	78,514	243,517		231,780
Provision for loan losses	335	2,432	959		3,919
Non-interest income	47,902	49,832	144,781		149,240
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(71,468)	(71,200)	(219,307)		(211,450)
Income before income taxes	58,781	59,578	169,950		173,489
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	11,744	10,782	35,515		32,604
Provision for loan losses	(10)	(5)	(9)		(120)
Non-interest income	40,404	36,676	116,961		107,696
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(30,528)	(28,172)	(90,323)		(85,116)
Income before income taxes	21,610	19,281	62,144		55,064
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	164,549	156,671	486,453		465,550
Provision for loan losses	(10,742)	(6,606)	(30,581)		(22,734)
Non-interest income	123,500	120,738	362,953		354,101
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(174,603)	(169,506)	(527,363)		(506,226)
Income before income taxes	102,704	101,297	291,462		290,691
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	18,042	14,572	57,218		41,297
Provision for loan losses	38	(657)	(2,009)		(3,184)
Non-interest income	(1,258)	(1,419)	(561)		812
Investment securities gains (losses), net	(3,037)	(1,965)	(2,158)		(3,704)
Non-interest expense	(9,969)	(11,736)	(28,633)		(29,578)
Income before income taxes	$ 3,816	$ (1,205)	$ 23,857		$ 5,643

[1] Available for sale and non-marketable securities