Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 215,962	$ 203,512	$ 620,084		$ 618,634
Provision for loan losses	(3,101)	(10,963)	(141,593)		(35,232)
Non-interest income	129,572	132,743	370,750		381,242
Investment securities gains (losses), net	16,155	4,909	(1,275)	[1]	3,874	[1]
Non-interest expense	(190,858)	(191,020)	(572,068)		(572,224)
Income before income taxes	167,730	139,181	275,898		396,294
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	80,944	80,111	241,195		236,215
Provision for loan losses	(7,654)	(10,757)	(23,885)		(33,061)
Non-interest income	37,116	36,049	107,492		98,840
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(73,074)	(73,872)	(225,791)		(223,355)
Income before income taxes	37,332	31,531	99,011		78,639
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	111,807	85,402	300,307		256,649
Provision for loan losses	(200)	(345)	(3,122)		(1,053)
Non-interest income	47,920	53,462	143,747		151,655
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(78,283)	(76,105)	(237,350)		(231,790)
Income before income taxes	81,244	62,414	203,582		175,461
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	15,310	11,525	41,686		35,662
Provision for loan losses	13	(197)	10		(165)
Non-interest income	47,701	45,721	139,700		133,556
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(31,013)	(30,248)	(93,156)		(91,708)
Income before income taxes	32,011	26,801	88,240		77,345
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	208,061	177,038	583,188		528,526
Provision for loan losses	(7,841)	(11,299)	(26,997)		(34,279)
Non-interest income	132,737	135,232	390,939		384,051
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(182,370)	(180,225)	(556,297)		(546,853)
Income before income taxes	150,587	120,746	390,833		331,445
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	7,901	26,474	36,896		90,108
Provision for loan losses	4,740	336	(114,596)		(953)
Non-interest income	(3,165)	(2,489)	(20,189)		(2,809)
Investment securities gains (losses), net	16,155	4,909	(1,275)		3,874
Non-interest expense	(8,488)	(10,795)	(15,771)		(25,371)
Income before income taxes	$ 17,143	$ 18,435	$ (114,935)		$ 64,849

[1] Available for sale debt securities, equity securities, and other securities.