Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net interest income		$ 201,065	$ 203,488
Provision for loan losses		(57,953)	(12,463)
Non-interest income		123,663	121,240
Investment securities gains (losses), net	[1]	(13,301)	(925)
Non-interest expense		(193,698)	(191,425)
Income before income taxes		59,776	119,915
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		78,981	76,692
Provision for loan losses		(11,206)	(11,049)
Non-interest income		34,085	29,171
Investment securities gains (losses), net		0	0
Non-interest expense		(77,219)	(73,429)
Income before income taxes		24,641	21,385
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		85,707	86,081
Provision for loan losses		356	(618)
Non-interest income		49,888	47,915
Investment securities gains (losses), net		0	0
Non-interest expense		(80,936)	(76,918)
Income before income taxes		55,015	56,460
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		12,959	11,726
Provision for loan losses		(3)	33
Non-interest income		47,410	43,534
Investment securities gains (losses), net		0	0
Non-interest expense		(31,861)	(30,555)
Income before income taxes		28,505	24,738
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income		177,647	174,499
Provision for loan losses		(10,853)	(11,634)
Non-interest income		131,383	120,620
Investment securities gains (losses), net		0	0
Non-interest expense		(190,016)	(180,902)
Income before income taxes		108,161	102,583
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income		23,418	28,989
Provision for loan losses		(47,100)	(829)
Non-interest income		(7,720)	620
Investment securities gains (losses), net		(13,301)	(925)
Non-interest expense		(3,682)	(10,523)
Income before income taxes		$ (48,385)	$ 17,332

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