Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net interest income		$ 998,129	$ 942,185	$ 835,424
Provision for loan losses		(35,451)	(28,071)	66,326
Non-interest income		573,045	546,535	560,393
Investment securities gains (losses), net	[1]	14,985	20,506	30,059
Non-interest expense		(930,982)	(848,777)	(805,901)
Income before income taxes		619,726	632,378	686,301
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Net interest income		28,633	48,334	(38,355)
Provision for loan losses		(4,451)	(9,035)	84,757
Non-interest income		8,711	1,719	9,510
Investment securities gains (losses), net		14,985	20,506	30,059
Non-interest expense		(54,485)	(29,688)	(40,234)
Income before income taxes		(6,607)	31,836	45,737
Consumer Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net interest income		413,856	366,749	348,565
Provision for loan losses		(27,459)	(17,832)	(23,224)
Non-interest income		99,910	106,538	126,218
Investment securities gains (losses), net		0	0	0
Non-interest expense		(326,838)	(308,899)	(299,998)
Income before income taxes		159,469	146,556	151,561
Commercial Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net interest income		482,389	452,686	453,692
Provision for loan losses		(3,513)	(1,196)	4,845
Non-interest income		246,183	224,890	211,048
Investment securities gains (losses), net		0	0	0
Non-interest expense		(391,980)	(365,276)	(329,313)
Income before income taxes		333,079	311,104	340,272
Wealth Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net interest income		73,251	74,416	71,522
Provision for loan losses		(28)	(8)	(52)
Non-interest income		218,241	213,388	213,617
Investment securities gains (losses), net		0	0	0
Non-interest expense		(157,679)	(144,914)	(136,356)
Income before income taxes		133,785	142,882	148,731
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income		969,496	893,851	873,779
Provision for loan losses		(31,000)	(19,036)	(18,431)
Non-interest income		564,334	544,816	550,883
Investment securities gains (losses), net		0	0	0
Non-interest expense		(876,497)	(819,089)	(765,667)
Income before income taxes		$ 626,333	$ 600,542	$ 640,564

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