Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 182,807	$ 171,829	$ 361,080		$ 335,604
Provision for loan losses	(10,758)	(9,216)	(21,886)		(18,655)
Non-interest income	123,084	116,570	240,150		235,594
Investment securities gains (losses), net	1,651	(744)	879	[1]	(1,739)	[1]
Non-interest expense	(184,594)	(177,089)	(371,424)		(354,562)
Income before income taxes	112,190	101,350	208,799		196,242
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	69,274	67,227	136,628		133,791
Provision for loan losses	(10,802)	(8,775)	(20,464)		(17,500)
Non-interest income	34,459	33,038	66,017		62,935
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(73,603)	(70,522)	(145,126)		(139,526)
Income before income taxes	19,328	20,968	37,055		39,700
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	81,718	77,249	161,505		153,266
Provision for loan losses	111	1,468	624		1,487
Non-interest income	49,746	48,289	96,879		99,408
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(74,054)	(70,637)	(147,839)		(140,250)
Income before income taxes	57,521	56,369	111,169		113,911
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	11,933	10,947	23,771		21,822
Provision for loan losses	24	(9)	1		(115)
Non-interest income	38,851	36,618	76,557		71,020
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(29,446)	(28,356)	(59,795)		(56,944)
Income before income taxes	21,362	19,200	40,534		35,783
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	162,925	155,423	321,904		308,879
Provision for loan losses	(10,667)	(7,316)	(19,839)		(16,128)
Non-interest income	123,056	117,945	239,453		233,363
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(177,103)	(169,515)	(352,760)		(336,720)
Income before income taxes	98,211	96,537	188,758		189,394
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	19,882	16,406	39,176		26,725
Provision for loan losses	(91)	(1,900)	(2,047)		(2,527)
Non-interest income	28	(1,375)	697		2,231
Investment securities gains (losses), net	1,651	(744)	879		(1,739)
Non-interest expense	(7,491)	(7,574)	(18,664)		(17,842)
Income before income taxes	$ 13,979	$ 4,813	$ 20,041		$ 6,848

[1] Available for sale and non-marketable securities