Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Loans [Line Items]
Loans, gross of unearned income	$ 11,940,005	$ 11,975,964
Unearned income	(7,004)	(6,994)
Loans, net of unearned income	11,933,001	11,968,970	11,895,655
Real-estate commercial mortage [Member]
Loans [Line Items]
Loans, gross of unearned income	4,632,509	4,602,596
Loans, net of unearned income	4,632,509		4,491,155
Commercial - industrial, financial, and agricultural
Loans [Line Items]
Loans, gross of unearned income	3,507,846	3,639,368
Loans, net of unearned income	3,507,846		3,690,164
Real-estate - home equity [Member]
Loans [Line Items]
Loans, gross of unearned income	1,603,456	1,624,562
Loans, net of unearned income	1,603,456		1,630,880
Real-estate - residential mortgage [Member]
Loans [Line Items]
Loans, gross of unearned income	1,213,831	1,097,192
Loans, net of unearned income	1,213,831		1,041,463
Real-estate - construction
Loans [Line Items]
Loans, gross of unearned income	597,358	615,445
Loans, net of unearned income	597,358		648,398
Consumer
Loans [Line Items]
Loans, gross of unearned income	301,182	318,101
Loans, net of unearned income	301,182		327,054
Leasing and other [Member]
Loans [Line Items]
Loans, gross of unearned income	71,343	63,254
Overdrafts [Member]
Loans [Line Items]
Loans, gross of unearned income	$ 12,480	$ 15,446

Reflects the cumulative amount of interest and fees paid by borrowers which have not yet been taken into income in conformity with GAAP. Also reflects the amount of 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 that are being amortized into income as an adjustment to yield.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

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-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

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-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph e

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-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524

+ Details

- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.

+ References+ Details