Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 210,959	$ 182,807	$ 403,851		$ 361,080
Provision for loan losses	(10,043)	(10,758)	(20,439)		(21,886)
Non-interest income	124,850	115,380	244,540		224,993
Investment securities gains (losses), net	(3,075)	1,651	2,335	[1]	879	[1]
Non-interest expense	(181,860)	(176,890)	(364,137)		(356,267)
Income before income taxes	140,831	112,190	266,150		208,799
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	73,471	69,274	144,908		136,628
Provision for loan losses	(10,409)	(10,802)	(20,924)		(20,464)
Non-interest income	32,116	29,617	62,332		56,780
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(72,095)	(68,374)	(142,266)		(135,791)
Income before income taxes	23,083	19,715	44,050		37,153
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	85,721	82,137	167,816		162,007
Provision for loan losses	308	111	488		624
Non-interest income	51,651	46,088	100,862		90,998
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(75,360)	(72,134)	(148,158)		(142,499)
Income before income taxes	62,320	56,202	121,008		111,130
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	11,857	11,934	23,302		23,778
Provision for loan losses	16	24	(48)		1
Non-interest income	42,896	38,852	84,997		76,558
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(30,254)	(29,494)	(62,113)		(59,813)
Income before income taxes	24,515	21,316	46,138		40,524
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	171,049	163,345	336,026		322,413
Provision for loan losses	(10,085)	(10,667)	(20,484)		(19,839)
Non-interest income	126,663	114,557	248,191		224,336
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(177,709)	(170,002)	(352,537)		(338,103)
Income before income taxes	109,918	97,233	211,196		188,807
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	39,910	19,462	67,825		38,667
Provision for loan losses	42	(91)	45		(2,047)
Non-interest income	(1,813)	823	(3,651)		657
Investment securities gains (losses), net	(3,075)	1,651	2,335		879
Non-interest expense	(4,151)	(6,888)	(11,600)		(18,164)
Income before income taxes	$ 30,913	$ 14,957	$ 54,954		$ 19,992

[1] Available for sale and non-marketable securities