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Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | $ 13,551,356 | $ 13,124,093 |
Unearned income | (14,995) | (12,377) |
Loans, net of unearned income | 13,536,361 | 13,111,716 | $ 13,030,405
Real-estate commercial mortage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | 5,339,928 | 5,197,155 |
Loans, net of unearned income | 5,339,928 | 5,197,155 | 5,156,979
Commercial - industrial, financial, and agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | 3,929,908 | 3,725,567 |
Loans, net of unearned income | 3,929,908 | 3,725,567 | 3,691,262
Real-estate - home equity [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | 1,693,649 | 1,736,688 |
Loans, net of unearned income | 1,693,649 | 1,736,688 | 1,733,036
Real-estate - residential mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | 1,382,085 | 1,377,068 |
Loans, net of unearned income | 1,382,085 | 1,377,068 | 1,372,033
Real-estate - construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | 769,565 | 690,601 |
Loans, net of unearned income | 769,565 | 690,601 | 687,728
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | 271,696 | 265,431 |
Loans, net of unearned income | 271,696 | 265,431 | $ 278,219
Leasing and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | 161,911 | 127,562 |
Overdrafts [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, gross of unearned income | $ 2,614 | $ 4,021 |

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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts 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 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 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) -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 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 + Details
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