Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 227,162				$ 224,900		$ 464,847	$ 449,881
Provision for loan and lease losses	19,352				13,319		33,036	26,975
Non-interest income	121,823				71,651		167,563	150,218
Non-interest expense	180,415				195,572		352,007	381,685
Income before provision for income taxes	149,218				87,660		247,367	191,439
Provision for income taxes	37,408				21,661		61,524	46,468
Net income	111,810	$ 74,033	$ 80,311	$ 90,981	65,999	$ 78,972	185,843	144,971
Total assets	27,986,075		26,939,781				27,986,075
Loans and leases	20,953,371		20,422,666		19,639,494		20,953,371	19,639,494
Total deposits	21,819,013		21,137,486				21,819,013
Wholesale Bank
Segment Reporting Information [Line Items]
Net interest income	110,883				112,249		219,161	223,984
Provision for loan and lease losses	16,490				11,276		28,480	24,644
Non-interest income	14,051				15,628		22,892	31,357
Non-interest expense	55,968				55,606		110,753	110,180
Income before provision for income taxes	52,476				60,995		102,820	120,517
Provision for income taxes	13,119				15,249		25,705	30,129
Net income	39,357				45,746		77,115	90,388
Total assets	15,122,715		14,920,507				15,122,715
Loans and leases	14,826,414		14,717,512				14,826,414
Total deposits	3,861,993		3,776,047				3,861,993
Wealth Management
Segment Reporting Information [Line Items]
Net interest income	6,084				5,536		12,473	11,539
Provision for loan and lease losses	576				182		821	349
Non-interest income	4,702				4,850		9,240	9,746
Non-interest expense	9,971				9,571		18,785	18,339
Income before provision for income taxes	239				633		2,107	2,597
Provision for income taxes	60				158		527	649
Net income	179				475		1,580	1,948
Total assets	635,001		536,024				635,001
Loans and leases	618,160		521,988				618,160
Total deposits	1,150,198		1,068,025				1,150,198
Retail Bank
Segment Reporting Information [Line Items]
Net interest income	86,047				80,998		174,495	160,850
Provision for loan and lease losses	1,116				594		2,245	955
Non-interest income	15,863				15,993		31,181	31,186
Non-interest expense	66,393				70,860		129,884	142,003
Income before provision for income taxes	34,401				25,537		73,547	49,078
Provision for income taxes	8,601				6,385		18,387	12,270
Net income	25,800				19,152		55,160	36,808
Total assets	2,007,335		2,015,263				2,007,335
Loans and leases	1,936,144		1,934,602				1,936,144
Total deposits	13,318,602		13,016,976				13,318,602
Home Lending
Segment Reporting Information [Line Items]
Net interest income	10,809				10,128		20,754	18,973
Provision for loan and lease losses	922				208		1,049	700
Non-interest income	9,514				33,278		20,906	71,686
Non-interest expense	32,954				35,032		61,454	67,329
Income before provision for income taxes	(13,553)				8,166		(20,843)	22,630
Provision for income taxes	(3,388)				2,041		(5,211)	5,657
Net income	(10,165)				6,125		(15,632)	16,973
Total assets	4,161,236		3,680,004				4,161,236
Loans and leases	3,634,935		3,320,634				3,634,935
Total deposits	310,329		219,584				310,329
Corporate & Other
Segment Reporting Information [Line Items]
Net interest income	13,339				15,989		37,964	34,535
Provision for loan and lease losses	248				1,059		441	327
Non-interest income	77,693				1,902		83,344	6,243
Non-interest expense	15,129				24,503		31,131	43,834
Income before provision for income taxes	75,655				(7,671)		89,736	(3,383)
Provision for income taxes	19,016				(2,172)		22,116	(2,237)
Net income	56,639				$ (5,499)		67,620	$ (1,146)
Total assets	6,059,788		5,787,983				6,059,788
Loans and leases	(62,282)		(72,070)				(62,282)
Total deposits	$ 3,177,891		$ 3,056,854				$ 3,177,891