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Loans (Schedule Of Loans By Portfolio Segment) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 27,701,740 | [1] |  | $ 27,658,929 | [1] | $ 19,989,319 |  |
Allowance for loan losses | 185,462 |  | $ 187,194 | 189,555 |  | 197,257 | $ 201,968 | $ 202,068
Total net loans | 27,516,278 |  |  | 27,469,374 |  |  |  |
Commercial, financial and industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 16,438,745 |  |  | 16,057,273 |  | 12,598,219 |  |
Allowance for loan losses | 96,834 |  | 100,238 | 98,211 |  | 92,379 | 93,107 | 89,398
Commercial real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 4,136,356 |  |  | 4,214,695 |  | 2,211,996 |  |
Allowance for loan losses | 33,832 |  | 29,057 | 28,427 |  | 30,470 | 30,888 | 33,852
Consumer real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 6,222,611 |  |  | 6,367,755 |  | 4,417,459 |  |
Allowance for loan losses | 31,769 |  | 32,750 | 37,371 |  | 46,069 | 49,680 | 50,357
Permanent mortgage |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 354,916 |  |  | 399,307 |  | 408,095 |  |
Allowance for loan losses | 14,078 |  | 15,435 | 15,565 |  | 16,398 | 15,893 | 16,289
Credit card & other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 549,112 |  |  | 619,899 |  | 353,550 |  |
Allowance for loan losses | 8,949 |  | $ 9,714 | 9,981 |  | $ 11,941 | $ 12,400 | $ 12,172
Restricted real estate loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 18,900 |  |  | $ 24,200 |  |  |  |
[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.

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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