Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net interest income		$ 178,273	$ 163,775
Provision for loan losses		(11,128)	(9,439)
Non-interest income		117,066	119,024
Investment securities gains (losses), net	[1]	(772)	(995)
Non-interest expense		(186,830)	(177,473)
Income before income taxes		96,609	94,892
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		67,354	66,564
Provision for loan losses		(9,662)	(8,725)
Non-interest income		31,558	29,897
Investment securities gains (losses), net		0	0
Non-interest expense		(71,523)	(69,004)
Income before income taxes		17,727	18,732
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		79,787	76,017
Provision for loan losses		513	19
Non-interest income		47,133	51,119
Investment securities gains (losses), net		0	0
Non-interest expense		(73,785)	(69,613)
Income before income taxes		53,648	57,542
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		11,838	10,875
Provision for loan losses		(23)	(106)
Non-interest income		37,706	34,402
Investment securities gains (losses), net		0	0
Non-interest expense		(30,349)	(28,588)
Income before income taxes		19,172	16,583
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income		158,979	153,456
Provision for loan losses		(9,172)	(8,812)
Non-interest income		116,397	115,418
Investment securities gains (losses), net		0	0
Non-interest expense		(175,657)	(167,205)
Income before income taxes		90,547	92,857
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income		19,294	10,319
Provision for loan losses		(1,956)	(627)
Non-interest income		669	3,606
Investment securities gains (losses), net		(772)	(995)
Non-interest expense		(11,173)	(10,268)
Income before income taxes		$ 6,062	$ 2,035

[1] Available for sale and non-marketable securities