Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 228,973				$ 241,368			$ 693,820	$ 691,249
Provision for loan and lease losses	23,227				11,711			56,263	38,686
Noninterest Income	88,512				72,388			256,075	222,606
Noninterest Expense	183,590				179,292			535,597	560,977
Income before provision for income taxes	110,668				122,753			358,035	314,192
Provision for income taxes	26,166				31,772			87,690	78,240
Net income	84,502	$ 111,810	$ 74,033	$ 80,311	90,981	$ 65,999	$ 78,972	270,345	235,952
Total assets	28,930,855			26,939,781				28,930,855
Total loans and leases	21,520,794			20,422,666	19,854,033			21,520,794	19,854,033
Total deposits	22,434,734			21,137,486				22,434,734
Wholesale Bank
Segment Reporting Information [Line Items]
Net interest income	111,047				113,103			330,208	337,087
Provision for loan and lease losses	20,693				10,786			49,173	35,430
Noninterest Income	16,053				15,282			38,945	46,639
Noninterest Expense	58,425				57,359			169,178	167,539
Income before provision for income taxes	47,982				60,240			150,802	180,757
Provision for income taxes	11,995				15,060			37,700	45,189
Net income	35,987				45,180			113,102	135,568
Total assets	15,509,793			14,920,507				15,509,793
Total loans and leases	15,170,243			14,717,512				15,170,243
Total deposits	4,015,123			3,776,047				4,015,123
Wealth Management
Segment Reporting Information [Line Items]
Net interest income	5,491				6,368			17,964	17,907
Provision for loan and lease losses	5				107			826	456
Noninterest Income	4,713				4,691			13,953	14,437
Noninterest Expense	10,315				8,403			29,100	26,742
Income before provision for income taxes	(116)				2,549			1,991	5,146
Provision for income taxes	(29)				638			498	1,287
Net income	(87)				1,911			1,493	3,859
Total assets	684,382			536,024				684,382
Total loans and leases	668,636			521,988				668,636
Total deposits	1,156,352			1,068,025				1,156,352
Retail Bank
Segment Reporting Information [Line Items]
Net interest income	84,235				87,885			258,730	248,735
Provision for loan and lease losses	1,356				830			3,601	1,785
Noninterest Income	16,196				16,105			47,377	47,291
Noninterest Expense	66,461				64,878			196,345	206,881
Income before provision for income taxes	32,614				38,282			106,161	87,360
Provision for income taxes	8,153				9,570			26,540	21,840
Net income	24,461				28,712			79,621	65,520
Total assets	1,989,096			2,015,263				1,989,096
Total loans and leases	1,915,330			1,934,602				1,915,330
Total deposits	13,711,620			13,016,976				13,711,620
Home Lending
Segment Reporting Information [Line Items]
Net interest income	13,039				10,495			33,793	29,468
Provision for loan and lease losses	904				202			1,953	902
Noninterest Income	47,161				32,712			68,067	104,398
Noninterest Expense	36,438				32,808			97,892	100,137
Income before provision for income taxes	22,858				10,197			2,015	32,827
Provision for income taxes	5,715				2,550			504	8,207
Net income	17,143				7,647			1,511	24,620
Total assets	4,366,847			3,680,004				4,366,847
Total loans and leases	3,831,214			3,320,634				3,831,214
Total deposits	453,833			219,584				453,833
Corporate & Other
Segment Reporting Information [Line Items]
Net interest income	15,161				23,517			53,125	58,052
Provision for loan and lease losses	269				(214)			710	113
Noninterest Income	4,389				3,598			87,733	9,841
Noninterest Expense	11,951				15,844			43,082	59,678
Income before provision for income taxes	7,330				11,485			97,066	8,102
Provision for income taxes	332				3,954			22,448	1,717
Net income	6,998				$ 7,531			74,618	$ 6,385
Total assets	6,380,737			5,787,983				6,380,737
Total loans and leases	(64,629)			(72,070)				(64,629)
Total deposits	$ 3,097,806			$ 3,056,854				$ 3,097,806