Segments (Schedule Of Financial Information By Segment) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2022 USD ($) Operating_Segments	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Operating_Segments		3
Net interest income		$ 942,185	$ 835,424	$ 829,847
Provision for loan losses		(28,071)	66,326	(137,190)
Non-interest income		546,535	560,393	505,867
Investment securities gains (losses), net	[1]	20,506	30,059	11,032
Non-interest expense		(848,777)	(805,901)	(768,378)
Income before income taxes		632,378	686,301	441,178
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		339,080	319,439	321,031
Provision for loan losses		(17,872)	(23,249)	(31,220)
Non-interest income		116,030	147,273	148,586
Investment securities gains (losses), net		0	0	0
Non-interest expense		(300,566)	(293,504)	(297,790)
Income before income taxes		136,672	149,959	140,607
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		452,686	453,692	414,724
Provision for loan losses		(1,196)	4,845	(3,724)
Non-interest income		224,890	211,048	194,505
Investment securities gains (losses), net		0	0	0
Non-interest expense		(365,276)	(329,313)	(316,004)
Income before income taxes		311,104	340,272	289,501
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		74,416	71,522	57,925
Provision for loan losses		(8)	(52)	12
Non-interest income		213,388	213,617	188,942
Investment securities gains (losses), net		0	0	0
Non-interest expense		(144,914)	(136,356)	(124,964)
Income before income taxes		142,882	148,731	121,915
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income		866,182	844,653	793,680
Provision for loan losses		(19,076)	(18,456)	(34,932)
Non-interest income		554,308	571,938	532,033
Investment securities gains (losses), net		0	0	0
Non-interest expense		(810,756)	(759,173)	(738,758)
Income before income taxes		590,658	638,962	552,023
Other/Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income		76,003	(9,229)	36,167
Provision for loan losses		(8,995)	84,782	(102,258)
Non-interest income		(7,773)	(11,545)	(26,166)
Investment securities gains (losses), net		20,506	30,059	11,032
Non-interest expense		(38,021)	(46,728)	(29,620)
Income before income taxes		$ 41,720	$ 47,339	$ (110,845)

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