Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net interest income (loss)	$ 212,503				$ 227,162		$ 431,038	$ 464,847
Provision for credit losses	87,085				19,352		205,170	33,036
Noninterest Income	115,480				121,823		156,125	167,563
Goodwill impairment	0				0		1,784,936	0
Non-Interest Expense before goodwill impairment							359,632
Noninterest Expense	181,910				180,415		2,144,568	352,007
Income (loss) before provision for income taxes	58,988				149,218		(1,762,575)	247,367
Provision for income taxes	6,062				37,408		36,446	61,524
Net income (loss)	52,926	$ (1,851,947)	$ 83,750	$ 84,502	111,810	$ 74,033	(1,799,021)	185,843
Total assets	29,645,248		28,846,809				29,645,248
Total loans and leases	22,671,455		21,195,684				22,671,455
Total deposits	24,844,378		22,481,504				24,844,378
Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	(823)				(3,951)		(15,129)	(6,431)
Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	(11,437)				(24,658)		(42,124)	(38,624)
Wholesale Bank
Segment Reporting Information [Line Items]
Net interest income (loss)	182,856				110,883		293,536	219,161
Provision for credit losses	75,463				16,490		177,842	28,480
Noninterest Income	12,133				14,051		13,743	22,892
Goodwill impairment							1,033,744
Non-Interest Expense before goodwill impairment							112,873
Noninterest Expense	56,517				55,968			110,753
Income (loss) before provision for income taxes	63,009				52,476		(1,017,180)	102,820
Provision for income taxes	3,016				13,119		21,033	25,705
Net income (loss)	59,993				39,357		(1,038,213)	77,115
Total assets	16,700,083		14,864,484				16,700,083
Total loans and leases	16,345,565		14,581,339				16,345,565
Total deposits	5,166,647		4,293,384				5,166,647
Wholesale Bank | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	(823)				(3,951)		(15,129)	(6,431)
Wholesale Bank | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0		0	0
Wealth Management
Segment Reporting Information [Line Items]
Net interest income (loss)	5,644				6,084		11,060	12,473
Provision for credit losses	2,548				576		4,488	821
Noninterest Income	4,238				4,702		8,858	9,240
Goodwill impairment							0
Non-Interest Expense before goodwill impairment							16,325
Noninterest Expense	8,261				9,971			18,785
Income (loss) before provision for income taxes	(927)				239		(895)	2,107
Provision for income taxes	(232)				60		(224)	527
Net income (loss)	(695)				179		(671)	1,580
Total assets	763,220		710,873				763,220
Total loans and leases	745,098		693,569				745,098
Total deposits	1,261,453		1,221,869				1,261,453
Wealth Management | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0		0	0
Wealth Management | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0		0	0
Retail Bank
Segment Reporting Information [Line Items]
Net interest income (loss)	79,641				86,047		160,689	174,495
Provision for credit losses	3,958				1,116		11,718	2,245
Noninterest Income	10,894				15,863		25,679	31,181
Goodwill impairment							751,192
Non-Interest Expense before goodwill impairment							125,621
Noninterest Expense	61,175				66,393			129,884
Income (loss) before provision for income taxes	25,402				34,401		(702,163)	73,547
Provision for income taxes	2,383				8,601		14,519	18,387
Net income (loss)	23,019				25,800		(716,682)	55,160
Total assets	2,178,338		2,293,362				2,178,338
Total loans and leases	2,076,794		2,209,990				2,076,794
Total deposits	15,570,862		13,717,335				15,570,862
Retail Bank | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0		0	0
Retail Bank | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0		0	0
Home Lending
Segment Reporting Information [Line Items]
Net interest income (loss)	16,706				10,809		31,528	20,754
Provision for credit losses	5,025				922		11,047	1,049
Noninterest Income	84,045				9,514		101,730	20,906
Goodwill impairment							0
Non-Interest Expense before goodwill impairment							84,359
Noninterest Expense	47,075				32,954			61,454
Income (loss) before provision for income taxes	48,651				(13,553)		37,852	(20,843)
Provision for income taxes	12,163				(3,388)		9,463	(5,211)
Net income (loss)	36,488				(10,165)		28,389	(15,632)
Total assets	4,299,298		4,423,869				4,299,298
Total loans and leases	3,558,812		3,768,584				3,558,812
Total deposits	431,135		279,226				431,135
Home Lending | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0		0	0
Home Lending | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	(11,437)				(24,658)		(42,124)	(38,624)
Corporate & Other (2)
Segment Reporting Information [Line Items]
Net interest income (loss)	(72,344)				13,339		(65,775)	37,964
Provision for credit losses	91				248		75	441
Noninterest Income	4,170				77,693		6,115	83,344
Goodwill impairment							0
Non-Interest Expense before goodwill impairment							20,454
Noninterest Expense	8,882				15,129			31,131
Income (loss) before provision for income taxes	(77,147)				75,655		(80,189)	89,736
Provision for income taxes	(11,268)				19,016		(8,345)	22,116
Net income (loss)	(65,879)				56,639		(71,844)	67,620
Total assets	5,704,309		6,554,221				5,704,309
Total loans and leases	(54,814)		(57,798)				(54,814)
Total deposits	2,414,281		$ 2,969,690				2,414,281
Corporate & Other (2) | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0		0	0
Corporate & Other (2) | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	$ 0				$ 0		$ 0	$ 0