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Loans (Schedule Of Loans By Portfolio Segment) (Details) - USD ($) | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income |  | $ 16,725,492,000 | [1] |  | $ 16,230,166,000 | $ 15,812,017,000 |  |
Allowance for loan losses |  | 210,814,000 |  | $ 221,351,000 | 232,448,000 | 238,641,000 | $ 243,628,000 | $ 253,809,000
Total net loans |  | 16,514,678,000 |  |  | 15,997,718,000 | 15,573,376,000 |  |
Commercial Financial And Industrial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income |  | 9,610,295,000 |  |  | 9,007,286,000 | 8,477,329,000 |  |
Allowance for loan losses |  | 71,463,000 |  | 78,750,000 | 67,011,000 | 69,870,000 | 68,591,000 | 86,446,000
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income |  | 1,488,044,000 |  |  | 1,277,717,000 | 1,278,394,000 |  |
Allowance for loan losses |  | 25,348,000 |  | 21,492,000 | 18,574,000 | 15,450,000 | 15,821,000 | 10,603,000
Consumer Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | [2] | 4,813,936,000 |  |  | 5,048,071,000 | 5,130,988,000 |  |
Allowance for loan losses |  | 82,472,000 |  | 85,457,000 | 113,011,000 | 118,395,000 | 118,037,000 | 126,785,000
Permanent Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income |  | 463,893,000 |  |  | 538,961,000 | 572,789,000 |  |
Allowance for loan losses |  | 20,076,000 |  | 22,377,000 | 19,122,000 | 20,221,000 | 23,727,000 | 22,491,000
Credit Card And Other Portfolio Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income |  | 349,324,000 |  |  | 358,131,000 | 352,517,000 |  |
Allowance for loan losses |  | 11,455,000 |  | $ 13,275,000 | 14,730,000 | 14,705,000 | $ 17,452,000 | $ 7,484,000
Restricted And Secured Consumer Real Estate Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income |  | $ 59,300,000 |  |  | $ 76,800,000 | $ 81,100,000 |  |
[1] | September 30, 2015 includes $30.7 million of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.
[2] | (a) Balances as of September 30, 2015 and 2014, and December 31, 2014 include $ 59. 3 million, $ 81 . 1 million, and $ 76.8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.

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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=49124121&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=49124121&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 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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