Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Segment Reporting Information [Line Items]
Net interest income	$ 214,037	$ 215,962	$ 627,767		$ 620,084
Provision for credit losses	7,385	(3,101)	59,272		(141,593)
Non-interest income	137,506	129,572	412,694		370,750
INVESTMENT SECURITIES GAINS (LOSSES), NET	13,108	16,155	39,765	[1]	(1,275)	[1]
Non-interest expense	(211,620)	(190,858)	(602,319)		(572,068)
Income before income taxes	160,416	167,730	537,179		275,898
Consumer segment
Segment Reporting Information [Line Items]
Net interest income	80,411	80,944	239,159		241,195
Provision for credit losses	(3,557)	(7,654)	(19,122)		(23,885)
Non-interest income	35,758	37,115	110,911		107,489
INVESTMENT SECURITIES GAINS (LOSSES), NET	0	0	0		0
Non-interest expense	(75,823)	(73,075)	(220,276)		(225,791)
Income before income taxes	36,789	37,330	110,672		99,008
Commercial segment
Segment Reporting Information [Line Items]
Net interest income	115,536	111,527	340,345		300,301
Provision for credit losses	(69)	(200)	4,856		(3,122)
Non-interest income	52,092	47,920	155,079		143,746
INVESTMENT SECURITIES GAINS (LOSSES), NET	0	0	0		0
Non-interest expense	(84,604)	(78,277)	(246,502)		(237,327)
Income before income taxes	82,955	80,970	253,778		203,598
Wealth segment
Segment Reporting Information [Line Items]
Net interest income	18,075	15,303	53,186		41,686
Provision for credit losses	9	13	10		10
Non-interest income	55,241	47,701	158,731		139,700
INVESTMENT SECURITIES GAINS (LOSSES), NET	0	0	0		0
Non-interest expense	(34,286)	(30,933)	(101,377)		(92,915)
Income before income taxes	39,039	32,084	110,550		88,481
Segment Totals
Segment Reporting Information [Line Items]
Net interest income	214,022	207,774	632,690		583,182
Provision for credit losses	(3,617)	(7,841)	(14,256)		(26,997)
Non-interest income	143,091	132,736	424,721		390,935
INVESTMENT SECURITIES GAINS (LOSSES), NET	0	0	0		0
Non-interest expense	(194,713)	(182,285)	(568,155)		(556,033)
Income before income taxes	158,783	150,384	475,000		391,087
Other/Elimination
Segment Reporting Information [Line Items]
Net interest income	15	8,188	(4,923)		36,902
Provision for credit losses	11,002	4,740	73,528		(114,596)
Non-interest income	(5,585)	(3,164)	(12,027)		(20,185)
INVESTMENT SECURITIES GAINS (LOSSES), NET	13,108	16,155	39,765		(1,275)
Non-interest expense	(16,907)	(8,573)	(34,164)		(16,035)
Income before income taxes	$ 1,633	$ 17,346	$ 62,179		$ (115,189)

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