Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 237,685				$ 224,981
Provision for loan and lease losses	13,684				13,656
Non-interest income	45,740				78,567
Non-interest expense	171,592				186,113
Income before provision for income taxes	98,149				103,779
Provision for income taxes	24,116				24,807
Net income	74,033	$ 80,311	$ 90,981	$ 65,999	78,972
Total assets	27,355,625	26,939,781
Loans and leases	20,405,997	20,422,666			19,255,347
Total deposits	21,243,894	21,137,486
Wholesale Bank
Segment Reporting Information [Line Items]
Net interest income	108,278				111,735
Provision for loan and lease losses	11,990				13,368
Non-interest income	8,841				15,729
Non-interest expense	54,785				54,574
Income before provision for income taxes	50,344				59,522
Provision for income taxes	12,586				14,880
Net income	37,758				44,642
Total assets	14,805,830	14,920,507
Loans and leases	14,577,704	14,717,512
Total deposits	3,632,822	3,776,047
Wealth Management
Segment Reporting Information [Line Items]
Net interest income	6,389				6,003
Provision for loan and lease losses	245				167
Non-interest income	4,538				4,896
Non-interest expense	8,814				8,768
Income before provision for income taxes	1,868				1,964
Provision for income taxes	467				491
Net income	1,401				1,473
Total assets	563,847	536,024
Loans and leases	549,614	521,988
Total deposits	1,099,198	1,068,025
Retail Bank
Segment Reporting Information [Line Items]
Net interest income	88,448				79,852
Provision for loan and lease losses	1,129				361
Non-interest income	15,318				15,193
Non-interest expense	63,491				71,143
Income before provision for income taxes	39,146				23,541
Provision for income taxes	9,786				5,885
Net income	29,360				17,656
Total assets	1,995,984	2,015,263
Loans and leases	1,924,224	1,934,602
Total deposits	13,184,058	13,016,976
Home Lending
Segment Reporting Information [Line Items]
Net interest income	9,945				8,845
Provision for loan and lease losses	127				492
Non-interest income	11,392				38,408
Non-interest expense	28,500				32,297
Income before provision for income taxes	(7,290)				14,464
Provision for income taxes	(1,823)				3,616
Net income	(5,467)				10,848
Total assets	3,850,087	3,680,004
Loans and leases	3,422,239	3,320,634
Total deposits	279,587	219,584
Corporate & Other
Segment Reporting Information [Line Items]
Net interest income	24,625				18,546
Provision for loan and lease losses	193				(732)
Non-interest income	5,651				4,341
Non-interest expense	16,002				19,331
Income before provision for income taxes	14,081				4,288
Provision for income taxes	3,100				(65)
Net income	10,981				$ 4,353
Total assets	6,139,877	5,787,983
Loans and leases	(67,784)	(72,070)
Total deposits	$ 3,048,229	$ 3,056,854