Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 203,512	$ 207,754	$ 618,634	$ 611,605
Provision for loan losses	(10,963)	(9,999)	(35,232)	(30,438)
Non-interest income	132,743	123,714	381,242	368,254
Investment securities gains (losses), net	4,909	4,306	3,874	6,641
Non-interest expense	(191,020)	(185,059)	(572,224)	(549,196)
Income before income taxes	139,181	140,716	396,294	406,866
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	80,111	74,594	236,215	218,719
Provision for loan losses	(10,757)	(9,592)	(33,061)	(30,252)
Non-interest income	36,049	31,397	98,840	93,729
Investment securities gains (losses), net	0	0	0	0
Non-interest expense	(73,948)	(70,861)	(223,580)	(212,442)
Income before income taxes	31,455	25,538	78,414	69,754
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	84,857	87,979	255,781	255,790
Provision for loan losses	(345)	(166)	(1,053)	322
Non-interest income	53,462	49,679	151,655	150,535
Investment securities gains (losses), net	0	0	0	0
Non-interest expense	(76,058)	(73,696)	(231,586)	(221,854)
Income before income taxes	61,916	63,796	174,797	184,793
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	11,548	11,704	35,800	35,006
Provision for loan losses	(197)	80	(165)	32
Non-interest income	46,410	43,790	135,774	128,794
Investment securities gains (losses), net	0	0	0	0
Non-interest expense	(30,538)	(30,436)	(92,647)	(92,546)
Income before income taxes	27,223	25,138	78,762	71,286
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	176,516	174,277	527,796	509,515
Provision for loan losses	(11,299)	(9,678)	(34,279)	(29,898)
Non-interest income	135,921	124,866	386,269	373,058
Investment securities gains (losses), net	0	0	0	0
Non-interest expense	(180,544)	(174,993)	(547,813)	(526,842)
Income before income taxes	120,594	114,472	331,973	325,833
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	26,996	33,477	90,838	102,090
Provision for loan losses	336	(321)	(953)	(540)
Non-interest income	(3,178)	(1,152)	(5,027)	(4,804)
Investment securities gains (losses), net	4,909	4,306	3,874	6,641
Non-interest expense	(10,476)	(10,066)	(24,411)	(22,354)
Income before income taxes	$ 18,587	$ 26,244	$ 64,321	$ 81,033