Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 218,535				$ 237,685
Provision for credit losses	118,085				13,684
Noninterest Income	40,645				45,740
Goodwill impairment	1,784,936				0
Non-Interest Expense before goodwill impairment	177,722
Noninterest Expense	1,962,658				171,592
(Loss) income before provision for income taxes	(1,821,563)				98,149
Provision for income taxes	30,384				24,116
Net (loss) income	(1,851,947)	$ 83,750	$ 84,502	$ 111,810	74,033
Total assets	27,540,382	28,846,809
Total loans and leases	21,251,478	21,195,684
Total deposits	22,699,375	22,481,504
Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	(14,306)				(2,480)
Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	(30,687)				(13,966)
Wholesale Bank
Segment Reporting Information [Line Items]
Net interest income	110,680				108,278
Provision for credit losses	102,379				11,990
Noninterest Income	1,610				8,841
Goodwill impairment	1,033,744
Non-Interest Expense before goodwill impairment	56,356
Noninterest Expense					54,785
(Loss) income before provision for income taxes	(1,080,189)				50,344
Provision for income taxes	18,017				12,586
Net (loss) income	(1,098,206)				37,758
Total assets	15,018,366	14,864,484
Total loans and leases	14,675,878	14,581,339
Total deposits	4,396,075	4,293,384
Wholesale Bank | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	(14,306)				(2,480)
Wholesale Bank | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0
Wealth Management
Segment Reporting Information [Line Items]
Net interest income	5,416				6,389
Provision for credit losses	1,940				245
Noninterest Income	4,620				4,538
Goodwill impairment	0
Non-Interest Expense before goodwill impairment	8,064
Noninterest Expense					8,814
(Loss) income before provision for income taxes	32				1,868
Provision for income taxes	8				467
Net (loss) income	24				1,401
Total assets	709,672	710,873
Total loans and leases	692,580	693,569
Total deposits	1,215,952	1,221,869
Wealth Management | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0
Wealth Management | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0
Retail Bank
Segment Reporting Information [Line Items]
Net interest income	81,048				88,448
Provision for credit losses	7,760				1,129
Noninterest Income	14,785				15,318
Goodwill impairment	751,192
Non-Interest Expense before goodwill impairment	64,446
Noninterest Expense					63,491
(Loss) income before provision for income taxes	(727,565)				39,146
Provision for income taxes	12,136				9,786
Net (loss) income	(739,701)				29,360
Total assets	2,307,676	2,293,362
Total loans and leases	2,205,684	2,209,990
Total deposits	14,010,375	13,717,335
Retail Bank | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0
Retail Bank | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0
Home Lending
Segment Reporting Information [Line Items]
Net interest income	14,822				9,945
Provision for credit losses	6,022				127
Noninterest Income	17,685				11,392
Goodwill impairment	0
Non-Interest Expense before goodwill impairment	37,284
Noninterest Expense					28,500
(Loss) income before provision for income taxes	(10,799)				(7,290)
Provision for income taxes	(2,700)				(1,823)
Net (loss) income	(8,099)				(5,467)
Total assets	4,368,330	4,423,869
Total loans and leases	3,734,858	3,768,584
Total deposits	372,308	279,226
Home Lending | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0
Home Lending | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	(30,687)				(13,966)
Corporate & Other
Segment Reporting Information [Line Items]
Net interest income	6,569				24,625
Provision for credit losses	(16)				193
Noninterest Income	1,945				5,651
Goodwill impairment	0
Non-Interest Expense before goodwill impairment	11,572
Noninterest Expense					16,002
(Loss) income before provision for income taxes	(3,042)				14,081
Provision for income taxes	2,923				3,100
Net (loss) income	(5,965)				10,981
Total assets	5,136,338	6,554,221
Total loans and leases	(57,522)	(57,798)
Total deposits	2,704,665	$ 2,969,690
Corporate & Other | Interest rate swaps
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	0				0
Corporate & Other | Residential mortgage servicing rights
Segment Reporting Information [Line Items]
Notable fair value adjustments included in non-interest income	$ 0				$ 0