Loans (Accruing And Non-Accruing Loans By Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2018		Dec. 31, 2017		Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	$ 27,701,740	[1]	$ 27,658,929	[1]	$ 19,989,319
General C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	13,720,744		13,550,990
Loans to Mortgage Companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	2,354,836		2,099,961
TRUPS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	306,830		306,915
Valuation allowance	25,500		25,500
Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	56,335		99,407
C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	16,438,745		16,057,273		12,598,219
Income CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	4,012,946		4,078,948
Residential CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	96,280		99,635
Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	27,130		36,112
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	4,136,356		4,214,695		2,211,996
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	1,638,171		1,823,710
R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	4,548,125		4,505,515
Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	36,315		38,530
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	6,222,611		6,367,755		4,417,459
Permanent mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	354,916		399,307		408,095
Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	192,001		196,364
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	354,056		418,035
Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	3,055		5,500
Credit card & other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, net of unearned income	549,112		619,899		$ 353,550
Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	27,491,809		27,435,858
Total Accruing	27,576,948		27,528,310
Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	49,219		50,884
Accruing | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	35,920		41,568
Accruing | General C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	13,696,352		13,514,752
Total Accruing	13,704,509		13,522,904
Accruing | General C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	7,518		8,057
Accruing | General C&I | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	639		95
Accruing | Loans to Mortgage Companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	2,354,836		2,099,961
Total Accruing	2,354,836		2,099,961
Accruing | Loans to Mortgage Companies | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Accruing | Loans to Mortgage Companies | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Accruing | TRUPS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	303,848		303,848
Total Accruing	303,848		303,848
Accruing | TRUPS | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Accruing | TRUPS | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Accruing | Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	41,046		77,843
Total Accruing	56,335		99,407
Accruing | Purchased credit-impaired loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	850		2,207
Accruing | Purchased credit-impaired loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	14,439		19,357
Accruing | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	16,396,082		15,996,404
Total Accruing	16,419,528		16,026,120
Accruing | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	8,368		10,264
Accruing | C&I | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	15,078		19,452
Accruing | Income CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	4,010,460		4,077,106
Total Accruing	4,011,896		4,078,346
Accruing | Income CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,436		1,240
Accruing | Income CRE | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Accruing | Residential CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	95,887		98,844
Total Accruing	95,887		98,844
Accruing | Residential CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Accruing | Residential CRE | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Accruing | Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	25,926		31,173
Total Accruing	27,130		36,112
Accruing | Purchased credit-impaired loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	968		2,686
Accruing | Purchased credit-impaired loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	236		2,253
Accruing | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	4,132,273		4,207,123
Total Accruing	4,134,913		4,213,302
Accruing | Commercial real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,404		3,926
Accruing | Commercial real estate | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	236		2,253
Accruing | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,557,368		1,743,776
Total Accruing	1,578,339		1,771,222
Accruing | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	13,302		17,744
Accruing | HELOC | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	7,669		9,702
Accruing | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	4,511,603		4,475,669
Total Accruing	4,528,555		4,486,516
Accruing | R/E Installment Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	10,938		7,274
Accruing | R/E Installment Loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,014		3,573
Accruing | Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	31,886		35,356
Total Accruing	36,315		38,530
Accruing | Purchased credit-impaired loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,819		2,016
Accruing | Purchased credit-impaired loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	610		1,158
Accruing | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	6,100,857		6,254,801
Total Accruing	6,143,209		6,296,268
Accruing | Consumer real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	28,059		27,034
Accruing | Consumer real estate | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	14,293		14,433
Accruing | Permanent mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	323,736		365,527
Total Accruing	330,546		372,917
Accruing | Permanent mortgage | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,391		3,930
Accruing | Permanent mortgage | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,419		3,460
Accruing | Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	189,849		193,940
Total Accruing	192,001		196,364
Accruing | Credit card | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,097		1,371
Accruing | Credit card | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,055		1,053
Accruing | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	347,702		415,070
Total Accruing	353,696		417,839
Accruing | Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,534		2,666
Accruing | Other | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	460		103
Accruing | Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,310		2,993
Total Accruing	3,055		5,500
Accruing | Purchased credit-impaired loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,366		1,693
Accruing | Purchased credit-impaired loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	379		814
Accruing | Credit card & other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	538,861		612,003
Total Accruing	548,752		619,703
Accruing | Credit card & other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	7,997		5,730
Accruing | Credit card & other | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,894		1,970
Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	84,233		70,040
Total Non- Accruing	124,792		130,619
Non-Accruing | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,794		13,654
Non-Accruing | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	33,765		46,925
Non-Accruing | General C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	9,358		1,761
Total Non- Accruing	16,235		28,086
Non-Accruing | General C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	510		7,019
Non-Accruing | General C&I | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	6,367		19,306
Non-Accruing | Loans to Mortgage Companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0		0
Total Non- Accruing	0		0
Non-Accruing | Loans to Mortgage Companies | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Loans to Mortgage Companies | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | TRUPS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0		0
Total Non- Accruing	2,982		3,067
Non-Accruing | TRUPS | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | TRUPS | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,982		3,067
Non-Accruing | Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0		0
Total Non- Accruing	0		0
Non-Accruing | Purchased credit-impaired loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Purchased credit-impaired loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	9,358		1,761
Total Non- Accruing	19,217		31,153
Non-Accruing | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	510		7,019
Non-Accruing | C&I | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	9,349		22,373
Non-Accruing | Income CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	43		56
Total Non- Accruing	1,050		602
Non-Accruing | Income CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	96		0
Non-Accruing | Income CRE | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	911		546
Non-Accruing | Residential CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0		0
Total Non- Accruing	393		791
Non-Accruing | Residential CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Residential CRE | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	393		791
Non-Accruing | Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0		0
Total Non- Accruing	0		0
Non-Accruing | Purchased credit-impaired loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Purchased credit-impaired loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	43		56
Total Non- Accruing	1,443		1,393
Non-Accruing | Commercial real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	96		0
Non-Accruing | Commercial real estate | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,304		1,337
Non-Accruing | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	46,823		40,508
Total Non- Accruing	59,832		52,488
Non-Accruing | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,157		3,626
Non-Accruing | HELOC | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	8,852		8,354
Non-Accruing | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	14,766		14,439
Total Non- Accruing	19,570		18,999
Non-Accruing | R/E Installment Loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,721		1,957
Non-Accruing | R/E Installment Loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,083		2,603
Non-Accruing | Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0		0
Total Non- Accruing	0		0
Non-Accruing | Purchased credit-impaired loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Purchased credit-impaired loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	61,589		54,947
Total Non- Accruing	79,402		71,487
Non-Accruing | Consumer real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,878		5,583
Non-Accruing | Consumer real estate | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	11,935		10,957
Non-Accruing | Permanent mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	13,143		13,245
Total Non- Accruing	24,370		26,390
Non-Accruing | Permanent mortgage | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	259		1,052
Non-Accruing | Permanent mortgage | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	10,968		12,093
Non-Accruing | Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0		0
Total Non- Accruing	0		0
Non-Accruing | Credit card | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Credit card | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	100		31
Total Non- Accruing	360		196
Non-Accruing | Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	51		0
Non-Accruing | Other | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	209		165
Non-Accruing | Purchased credit-impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0		0
Total Non- Accruing	0		0
Non-Accruing | Purchased credit-impaired loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Purchased credit-impaired loans | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0		0
Non-Accruing | Credit card & other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	100		31
Total Non- Accruing	360		196
Non-Accruing | Credit card & other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	51		0
Non-Accruing | Credit card & other | 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 209		$ 165

[1] June 30, 2018 and December 31, 2017 include $21.4 million and $22.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.