Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 234,907	$ 216,574	$ 212,503	$ 218,535	$ 226,814	$ 228,973	$ 227,162	$ 237,685	$ 882,519	$ 920,634	$ 938,639
Provision for credit losses	29	(338)	87,085	118,085					204,861	72,515	55,905
Provision for loan and lease losses					16,252	23,227	19,352	13,684		72,515	55,905
Noninterest Income	123,960	131,924	115,480	40,645	83,749	88,512	121,823	45,740	412,009	339,824	279,417
Goodwill impairment									1,784,936	0	0
Non-interest expense (excluding goodwill impairment)									761,151
Non-interest expense	211,312	190,207	181,910	1,962,658	183,443	183,590	180,415	171,592	2,546,087	719,040	739,465
(Loss) income before income taxes	147,526	158,629	58,988	(1,821,563)	110,868	110,668	149,218	98,149	(1,456,420)	468,903	422,686
(Benefit) provision for income taxes	(3,204)	33,758	6,062	30,384	27,118	26,166	37,408	24,116	67,000	114,808	106,423
Net Income (Loss) Attributable to Parent	150,730	$ 124,871	$ 52,926	$ (1,851,947)	83,750	$ 84,502	$ 111,810	$ 74,033	(1,523,420)	354,095	316,263
Total assets	29,235,175				28,846,809				29,235,175	28,846,809	26,939,781
Loans and leases	21,779,367				21,195,684				21,779,367	21,195,684	20,422,666
Total deposits	24,622,201				22,481,504				24,622,201	22,481,504	21,137,486
Interest rate swaps
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									(9,409)	(6,038)	(1,362)
Residential Mortgage Servicing Rights [Member]
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									(73,103)	(44,783)	(13,195)
Wholesale Bank
Segment Reporting Information [Line Items]
Net interest income (expense)									539,454	447,449	453,291
Provision for credit losses									196,363	65,550
Provision for loan and lease losses											50,110
Noninterest Income									49,018	65,975	59,129
Goodwill impairment									1,033,744
Non-interest expense (excluding goodwill impairment)									249,546
Non-interest expense										233,516	226,758
(Loss) income before income taxes									(891,181)	214,358	235,552
(Benefit) provision for income taxes									40,997	53,589	59,308
Net Income (Loss) Attributable to Parent									(932,178)	160,769	176,244
Total assets	16,652,657				15,404,164				16,652,657	15,404,164	14,973,789
Loans and leases	16,340,002				15,119,857				16,340,002	15,119,857	14,770,562
Total deposits	5,375,568				4,462,630				5,375,568	4,462,630	3,776,049
Wholesale Bank | Interest rate swaps
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									(9,409)	(6,038)	(1,362)
Wholesale Bank | Residential Mortgage Servicing Rights [Member]
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									0	0	0
Wealth Management
Segment Reporting Information [Line Items]
Net interest income (expense)									23,514	23,240	24,346
Provision for credit losses									2,144	804
Provision for loan and lease losses											1,025
Noninterest Income									17,305	18,658	19,434
Goodwill impairment									0
Non-interest expense (excluding goodwill impairment)									33,748
Non-interest expense										36,976	36,162
(Loss) income before income taxes									4,927	4,118	6,593
(Benefit) provision for income taxes									1,232	1,030	1,648
Net Income (Loss) Attributable to Parent									3,695	3,088	4,945
Total assets	833,203				710,873				833,203	710,873	536,024
Loans and leases	813,463				693,569				813,463	693,569	521,988
Total deposits	1,296,075				1,221,869				1,296,075	1,221,869	1,068,025
Wealth Management | Interest rate swaps
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									0	0	0
Wealth Management | Residential Mortgage Servicing Rights [Member]
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									0	0	0
Retail Bank
Segment Reporting Information [Line Items]
Net interest income (expense)									265,703	332,725	337,402
Provision for credit losses									6,667	3,719
Provision for loan and lease losses											3,343
Noninterest Income									59,488	62,856	63,429
Goodwill impairment									751,192
Non-interest expense (excluding goodwill impairment)									238,169
Non-interest expense										255,632	272,454
(Loss) income before income taxes									(670,837)	136,230	125,034
(Benefit) provision for income taxes									30,861	34,058	31,482
Net Income (Loss) Attributable to Parent									(701,698)	102,172	93,552
Total assets	1,546,243				1,753,682				1,546,243	1,753,682	1,962,005
Loans and leases	1,388,752				1,671,472				1,388,752	1,671,472	1,881,568
Total deposits	15,644,208				13,548,089				15,644,208	13,548,089	13,016,974
Retail Bank | Interest rate swaps
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									0	0	0
Retail Bank | Residential Mortgage Servicing Rights [Member]
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									0	0	0
Home Lending
Segment Reporting Information [Line Items]
Net interest income (expense)									68,994	46,603	39,897
Provision for credit losses									(428)	2,033
Provision for loan and lease losses											1,628
Noninterest Income									271,580	102,239	119,538
Goodwill impairment									0
Non-interest expense (excluding goodwill impairment)									180,857
Non-interest expense										135,168	130,384
(Loss) income before income taxes									160,145	11,641	27,423
(Benefit) provision for income taxes									40,036	2,910	6,856
Net Income (Loss) Attributable to Parent									120,109	8,731	20,567
Total assets	4,119,896				4,423,869				4,119,896	4,423,869	3,680,005
Loans and leases	3,286,092				3,768,584				3,286,092	3,768,584	3,320,634
Total deposits	431,568				279,226				431,568	279,226	219,584
Home Lending | Interest rate swaps
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									0	0	0
Home Lending | Residential Mortgage Servicing Rights [Member]
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									(73,103)	(44,783)	(13,195)
Corporate & Other (2)
Segment Reporting Information [Line Items]
Net interest income (expense)									(15,146)	70,617	83,703
Provision for credit losses									115	409
Provision for loan and lease losses											(201)
Noninterest Income									14,618	90,096	17,887
Goodwill impairment									0
Non-interest expense (excluding goodwill impairment)									58,831
Non-interest expense										57,748	73,707
(Loss) income before income taxes									(59,474)	102,556	28,084
(Benefit) provision for income taxes									(46,126)	23,221	7,129
Net Income (Loss) Attributable to Parent									(13,348)	79,335	20,955
Total assets	6,083,176				6,554,221				6,083,176	6,554,221	5,787,958
Loans and leases	(48,942)				(57,798)				(48,942)	(57,798)	(72,086)
Total deposits	$ 1,874,782				$ 2,969,690				1,874,782	2,969,690	3,056,854
Corporate & Other (2) | Interest rate swaps
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									0	0	0
Corporate & Other (2) | Residential Mortgage Servicing Rights [Member]
Segment Reporting Information [Line Items]
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions									$ 0	$ 0	$ 0