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Loans (Accruing And Non-Accruing Loans By Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 20,166,091 [1] $ 19,589,520 [1] $ 19,555,787
Commercial Financial And Industrial Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 12,791,844 12,148,087 12,118,298
Consumer Real Estate Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 4,369,717 4,523,752 4,578,371
Commercial Real Estate Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 2,251,015 2,135,523 2,065,595
Permanent Mortgage Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 403,082 423,125 436,100
Credit Card And Other Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 350,433 359,033 $ 357,423
General C I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 10,497,631 9,754,921  
Loans To Mortgage Companies [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,966,155 2,045,189  
TRUPs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 307,333 307,445 [2]  
Valuation allowance 25,500 25,500  
Income C R E      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 2,205,377 2,087,450  
Residential C R E      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 41,838 43,155  
Home Equity Line of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,453,945 1,691,583  
R E Installment Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 2,914,477 2,830,593  
Credit Card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 194,049 191,651  
Other Consumer Loans Class      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 156,384 167,330  
C&I Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 20,725 40,532  
CRE Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,800 4,918  
RE Installment Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,295 1,576  
Other Purchased Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 0 52  
Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 19,964,907 19,377,918  
Total Accruing 20,041,105 19,443,873  
Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 45,248 42,570  
Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 30,950 23,385  
Accruing | Commercial Financial And Industrial Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 12,738,821 12,105,988  
Total Accruing 12,772,919 12,115,351  
Accruing | Commercial Financial And Industrial Portfolio Segment | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 19,394 9,106  
Accruing | Commercial Financial And Industrial Portfolio Segment | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 14,704 257  
Accruing | Consumer Real Estate Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 4,260,481 4,398,825  
Total Accruing 4,292,872 4,440,940  
Accruing | Consumer Real Estate Portfolio Segment [Member] | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 20,167 26,005  
Accruing | Consumer Real Estate Portfolio Segment [Member] | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 12,224 16,110  
Accruing | Commercial Real Estate Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 2,248,885 2,132,446  
Total Accruing 2,249,375 2,132,747  
Accruing | Commercial Real Estate Portfolio Segment | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 490 301  
Accruing | Commercial Real Estate Portfolio Segment | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Accruing | Permanent Mortgage Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 369,546 385,972  
Total Accruing 375,632 395,944  
Accruing | Permanent Mortgage Portfolio Segment | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,333 4,544  
Accruing | Permanent Mortgage Portfolio Segment | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,753 5,428  
Accruing | Credit Card And Other Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 347,174 354,687  
Total Accruing 350,307 358,891  
Accruing | Credit Card And Other Portfolio Segment | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,864 2,614  
Accruing | Credit Card And Other Portfolio Segment | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,269 1,590  
Accruing | General C I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 10,462,376 9,720,231  
Total Accruing 10,481,829 9,725,453  
Accruing | General C I | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 19,324 5,199  
Accruing | General C I | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 129 23  
Accruing | Loans To Mortgage Companies [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 1,966,129 2,041,408  
Total Accruing 1,966,129 2,045,130  
Accruing | Loans To Mortgage Companies [Member] | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 3,722  
Accruing | Loans To Mortgage Companies [Member] | 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 304,236 304,236 [2]  
Total Accruing 304,236 304,236 [2]  
Accruing | TRUPs | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0 [2]  
Accruing | TRUPs | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0 [2]  
Accruing | Income C R E      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 2,204,042 2,085,455  
Total Accruing 2,204,532 2,085,469  
Accruing | Income C R E | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 490 14  
Accruing | Income C R E | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Accruing | Residential C R E      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 41,043 42,182  
Total Accruing 41,043 42,360  
Accruing | Residential C R E | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 178  
Accruing | Residential C R E | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Accruing | Home Equity Line of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 1,375,690 1,602,640  
Total Accruing 1,398,520 1,631,496  
Accruing | Home Equity Line of Credit | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 14,312 17,997  
Accruing | Home Equity Line of Credit | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 8,518 10,859  
Accruing | R E Installment Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 2,883,593 2,794,866  
Total Accruing 2,893,057 2,807,868  
Accruing | R E Installment Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 5,855 7,844  
Accruing | R E Installment Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,609 5,158  
Accruing | Credit Card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 191,714 188,573  
Total Accruing 194,049 191,651  
Accruing | Credit Card | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,254 1,622  
Accruing | Credit Card | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,081 1,456  
Accruing | Other Consumer Loans Class      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 155,460 166,062  
Total Accruing 156,258 167,188  
Accruing | Other Consumer Loans Class | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 610 992  
Accruing | Other Consumer Loans Class | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 188 134  
Accruing | C&I Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 6,080 40,113  
Total Accruing 20,725 40,532  
Accruing | C&I Purchase Credit Impaired Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 70 185  
Accruing | C&I Purchase Credit Impaired Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 14,575 234  
Accruing | CRE Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 3,800 4,809  
Total Accruing 3,800 4,918  
Accruing | CRE Purchase Credit Impaired Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 109  
Accruing | CRE Purchase Credit Impaired Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Accruing | RE Installment Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 1,198 1,319  
Total Accruing 1,295 1,576  
Accruing | RE Installment Purchase Credit Impaired Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 164  
Accruing | RE Installment Purchase Credit Impaired Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 97 93  
Accruing | Other Purchased Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 52  
Total Accruing 0 52  
Accruing | Other Purchased Credit Impaired Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Accruing | Other Purchased Credit Impaired Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 76,620 93,158  
Total Non-Accruing 124,986 145,647  
Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7,921 9,612  
Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 40,445 42,877  
Non-Accruing | Commercial Financial And Industrial Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 5,260 16,106  
Total Non-Accruing 18,925 32,736  
Non-Accruing | Commercial Financial And Industrial Portfolio Segment | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,252 374  
Non-Accruing | Commercial Financial And Industrial Portfolio Segment | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 12,413 16,256  
Non-Accruing | Consumer Real Estate Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 58,698 64,953  
Total Non-Accruing 76,845 82,812  
Non-Accruing | Consumer Real Estate Portfolio Segment [Member] | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 6,092 6,584  
Non-Accruing | Consumer Real Estate Portfolio Segment [Member] | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 12,055 11,275  
Non-Accruing | Commercial Real Estate Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 105 232  
Total Non-Accruing 1,640 2,776  
Non-Accruing | Commercial Real Estate Portfolio Segment | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 460  
Non-Accruing | Commercial Real Estate Portfolio Segment | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,535 2,084  
Non-Accruing | Permanent Mortgage Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 12,557 11,867  
Total Non-Accruing 27,450 27,181  
Non-Accruing | Permanent Mortgage Portfolio Segment | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 577 2,194  
Non-Accruing | Permanent Mortgage Portfolio Segment | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 14,316 13,120  
Non-Accruing | Credit Card And Other Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 126 142  
Non-Accruing | Credit Card And Other Portfolio Segment | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | Credit Card And Other Portfolio Segment | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 126 142  
Non-Accruing | General C I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 5,260 16,106  
Total Non-Accruing 15,802 29,468  
Non-Accruing | General C I | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,252 374  
Non-Accruing | General C I | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 9,290 12,988  
Non-Accruing | Loans To Mortgage Companies [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 26 59  
Non-Accruing | Loans To Mortgage Companies [Member] | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | Loans To Mortgage Companies [Member] | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 26 59  
Non-Accruing | TRUPs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0 [2]  
Total Non-Accruing 3,097 3,209 [2]  
Non-Accruing | TRUPs | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0 [2]  
Non-Accruing | TRUPs | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,097 3,209 [2]  
Non-Accruing | Income C R E      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 105 232  
Total Non-Accruing 845 1,981  
Non-Accruing | Income C R E | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 460  
Non-Accruing | Income C R E | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 740 1,289  
Non-Accruing | Residential C R E      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 795 795  
Non-Accruing | Residential C R E | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | Residential C R E | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 795 795  
Non-Accruing | Home Equity Line of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 43,188 46,964  
Total Non-Accruing 55,425 60,087  
Non-Accruing | Home Equity Line of Credit | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,217 4,201  
Non-Accruing | Home Equity Line of Credit | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 9,020 8,922  
Non-Accruing | R E Installment Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 15,510 17,989  
Total Non-Accruing 21,420 22,725  
Non-Accruing | R E Installment Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,875 2,383  
Non-Accruing | R E Installment Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,035 2,353  
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 Consumer Loans Class      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 126 142  
Non-Accruing | Other Consumer Loans Class | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | Other Consumer Loans Class | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 126 142  
Non-Accruing | C&I Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Non-Accruing | C&I Purchase Credit Impaired Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | C&I Purchase Credit Impaired Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | CRE Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Non-Accruing | CRE Purchase Credit Impaired Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | CRE Purchase Credit Impaired Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | RE Installment Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Non-Accruing | RE Installment Purchase Credit Impaired Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | RE Installment Purchase Credit Impaired Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | Other Purchased Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Non-Accruing | Other Purchased Credit Impaired Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Non-Accruing | Other Purchased Credit Impaired Loans | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due $ 0 $ 0  
[1] September 30, 2017 and December 31, 2016 include $24.8 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.
[2] TRUPS is presented net of the valuation allowance of $25.5 million.