Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 207,754	$ 182,591	$ 611,605		$ 543,671
Provision for loan losses	(9,999)	(10,704)	(30,438)		(32,590)
Non-interest income	123,714	116,887	368,254		341,880
Investment securities gains (losses), net	4,306	(3,037)	6,641	[1]	(2,158)	[1]
Non-interest expense	(185,059)	(179,217)	(549,196)		(535,484)
Income before income taxes	140,716	106,520	406,866		315,319
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	74,933	70,793	219,841		207,421
Provision for loan losses	(9,734)	(11,067)	(30,658)		(31,531)
Non-interest income	31,397	31,633	93,729		88,413
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(71,171)	(69,149)	(213,437)		(204,940)
Income before income taxes	25,425	22,210	69,475		59,363
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	87,947	82,081	255,763		244,088
Provision for loan losses	(166)	335	322		959
Non-interest income	49,673	46,141	150,535		137,139
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(73,696)	(69,828)	(221,854)		(212,327)
Income before income taxes	63,758	58,729	184,766		169,859
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	11,704	11,737	35,006		35,515
Provision for loan losses	80	(10)	32		(9)
Non-interest income	43,797	40,403	128,794		116,961
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(30,439)	(30,565)	(92,552)		(90,378)
Income before income taxes	25,142	21,565	71,280		62,089
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	174,584	164,611	510,610		487,024
Provision for loan losses	(9,820)	(10,742)	(30,304)		(30,581)
Non-interest income	124,867	118,177	373,058		342,513
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(175,306)	(169,542)	(527,843)		(507,645)
Income before income taxes	114,325	102,504	325,521		291,311
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	33,170	17,980	100,995		56,647
Provision for loan losses	(179)	38	(134)		(2,009)
Non-interest income	(1,153)	(1,290)	(4,804)		(633)
Investment securities gains (losses), net	4,306	(3,037)	6,641		(2,158)
Non-interest expense	(9,753)	(9,675)	(21,353)		(27,839)
Income before income taxes	$ 26,391	$ 4,016	$ 81,345		$ 24,008

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