Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 203,057	$ 211,634	$ 404,122		$ 415,122
Provision for loan losses	(80,539)	(11,806)	(138,492)		(24,269)
Non-interest income	117,515	127,259	241,178		248,499
Investment securities gains (losses), net	(4,129)	(110)	(17,430)	[1]	(1,035)	[1]
Non-interest expense	(187,512)	(189,779)	(381,210)		(381,204)
Income before income taxes	48,392	137,198	108,168		257,113
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	81,270	79,412	160,251		156,104
Provision for loan losses	(5,025)	(11,255)	(16,231)		(22,304)
Non-interest income	36,291	33,620	70,376		62,791
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(75,498)	(76,054)	(152,717)		(149,483)
Income before income taxes	37,038	25,723	61,679		47,108
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	102,793	85,166	188,500		171,247
Provision for loan losses	(3,278)	(90)	(2,922)		(708)
Non-interest income	45,939	50,278	95,827		98,193
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(78,131)	(78,767)	(159,067)		(155,685)
Income before income taxes	67,323	56,587	122,338		113,047
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	13,417	12,411	26,376		24,137
Provision for loan losses	0	(1)	(3)		32
Non-interest income	44,589	44,301	91,999		87,835
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(30,282)	(30,905)	(62,143)		(61,460)
Income before income taxes	27,724	25,806	56,229		50,544
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	197,480	176,989	375,127		351,488
Provision for loan losses	(8,303)	(11,346)	(19,156)		(22,980)
Non-interest income	126,819	128,199	258,202		248,819
Investment securities gains (losses), net	0	0	0		0
Non-interest expense	(183,911)	(185,726)	(373,927)		(366,628)
Income before income taxes	132,085	108,116	240,246		210,699
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	5,577	34,645	28,995		63,634
Provision for loan losses	(72,236)	(460)	(119,336)		(1,289)
Non-interest income	(9,304)	(940)	(17,024)		(320)
Investment securities gains (losses), net	(4,129)	(110)	(17,430)		(1,035)
Non-interest expense	(3,601)	(4,053)	(7,283)		(14,576)
Income before income taxes	$ (83,693)	$ 29,082	$ (132,078)		$ 46,414

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