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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | $ 4,324,383 |  | $ 4,317,099 |
Accrued interest receivable | 14,200 |  | 14,684 |
Total recorded investment | 4,338,583 |  | 4,331,783 |
Commercial, Financial And Agricultural [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 752,392 | [1] | 743,797 | [1]
Accrued interest receivable | 3,439 | [1] | 3,121 | [1]
Total recorded investment | 755,831 | [1] | 746,918 | [1]
Construction Real Estate - Vision/SE LLC Commercial Land And Development [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 26,081 | [1] | 31,603 | [1]
Accrued interest receivable | 39 | [1] | 31 | [1]
Total recorded investment | 26,120 | [1] | 31,634 | [1]
Construction Real Estate - Remaining Commercial [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 148,922 |  | 156,053 |
Accrued interest receivable | 425 |  | 394 |
Total recorded investment | 149,347 |  | 156,447 |
Construction Real Estate - Mortgage [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 19,628 |  | 20,039 |
Accrued interest receivable | 65 |  | 64 |
Total recorded investment | 19,693 |  | 20,103 |
Construction Real Estate - Installment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 9,184 |  | 9,851 |
Accrued interest receivable | 44 |  | 61 |
Total recorded investment | 9,228 |  | 9,912 |
Residential Real Estate - Commercial [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 392,552 |  | 395,824 |
Accrued interest receivable | 1,120 |  | 1,105 |
Total recorded investment | 393,672 |  | 396,929 |
Residential Real Estate - Mortgage [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 1,004,957 |  | 953,758 |
Accrued interest receivable | 1,540 |  | 1,522 |
Total recorded investment | 1,006,497 |  | 955,280 |
Residential Real Estate - HELOC [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 221,780 |  | 227,682 |
Accrued interest receivable | 884 |  | 942 |
Total recorded investment | 222,664 |  | 228,624 |
Residential Real Estate - Installment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 48,410 |  | 51,354 |
Accrued interest receivable | 217 |  | 236 |
Total recorded investment | 48,627 |  | 51,590 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 1,088,348 | [1] | 1,108,574 | [1]
Accrued interest receivable | 3,795 | [1] | 4,235 | [1]
Total recorded investment | 1,092,143 | [1] | 1,112,809 | [1]
Consumer [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 610,180 |  | 616,505 |
Accrued interest receivable | 2,580 |  | 2,930 |
Total recorded investment | 612,760 |  | 619,435 |
Leases [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | 1,949 |  | 2,059 |
Accrued interest receivable | 52 |  | 43 |
Total recorded investment | $ 2,001 |  | $ 2,102 |
[1] | Included within commercial, financial and agricultural loans, commercial real estate loans, and Vision/SE LLC commercial land and development loans is an immaterial amount of consumer loans that are not broken out by class.

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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -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. + Details
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