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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 105,873 |  | $ 130,303 | $ 112,315 |
Loan balance | 4,623,926 |  |  | 4,620,505 |
Accrued interest receivable | 13,135 |  |  | 13,494 |
Recorded Investment | 4,637,061 |  |  | 4,633,999 |
Impaired Financing Receivable, Average Recorded Investment | 107,878 |  | 133,727 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 680 |  | 734 |  |
Commercial Financial And Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 19,835 |  | 21,742 |  |
Impaired Financing Receivable, Average Recorded Investment | 20,140 |  | 21,479 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 61 |  | 128 |  |
Construction Real Estate - SEPH Commercial Land And Development [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 4,102 |  | 10,482 |  |
Loan balance | 4,955 | [1] |  | 5,846 | [1]
Accrued interest receivable | 2 | [1] |  | 2 | [1]
Recorded Investment | 4,957 | [1] |  | 5,848 | [1]
Impaired Financing Receivable, Average Recorded Investment | 4,464 |  | 12,082 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 56 |  | 0 |  |
Construction Real Estate - Remaining Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 10,530 |  | 20,483 |  |
Loan balance | 113,575 |  |  | 110,842 |
Accrued interest receivable | 263 |  |  | 263 |
Recorded Investment | 113,838 |  |  | 111,105 |
Impaired Financing Receivable, Average Recorded Investment | 10,379 |  | 20,912 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 47 |  | 220 |  |
Construction Real Estate - Mortgage [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loan balance | 29,291 |  |  | 31,882 |
Accrued interest receivable | 84 |  |  | 96 |
Recorded Investment | 29,375 |  |  | 31,978 |
Construction Real Estate - Installment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loan balance | 7,593 |  |  | 7,546 |
Accrued interest receivable | 26 |  |  | 26 |
Recorded Investment | 7,619 |  |  | 7,572 |
Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 31,213 |  | 36,722 |  |
Loan balance | 405,138 |  |  | 407,387 |
Accrued interest receivable | 1,016 |  |  | 904 |
Recorded Investment | 406,154 |  |  | 408,291 |
Impaired Financing Receivable, Average Recorded Investment | 31,101 |  | 35,859 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 263 |  | 130 |  |
Residential Real Estate - Mortgage [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loan balance | 1,152,163 |  |  | 1,144,754 |
Accrued interest receivable | 1,604 |  |  | 1,559 |
Recorded Investment | 1,153,767 |  |  | 1,146,313 |
Residential Real Estate - HELOC [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loan balance | 211,005 |  |  | 213,565 |
Accrued interest receivable | 825 |  |  | 870 |
Recorded Investment | 211,830 |  |  | 214,435 |
Residential Real Estate - Installment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loan balance | 31,804 |  |  | 33,841 |
Accrued interest receivable | 123 |  |  | 132 |
Recorded Investment | 31,927 |  |  | 33,973 |
Commercial Financial And Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loan balance | 806,732 | [1] |  | 825,432 | [1]
Accrued interest receivable | 3,237 | [1] |  | 3,079 | [1]
Recorded Investment | 809,969 | [1] |  | 828,511 | [1]
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 39,395 |  | 40,075 |  |
Loan balance | 1,099,997 | [1] |  | 1,112,273 | [1]
Accrued interest receivable | 3,330 | [1] |  | 3,765 | [1]
Recorded Investment | 1,103,327 | [1] |  | 1,116,038 | [1]
Impaired Financing Receivable, Average Recorded Investment | 40,995 |  | 43,191 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 253 |  | 256 |  |
Consumer [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 798 |  | 799 |  |
Loan balance | 758,347 |  |  | 723,733 |
Accrued interest receivable | 2,578 |  |  | 2,775 |
Recorded Investment | 760,925 |  |  | 726,508 |
Impaired Financing Receivable, Average Recorded Investment | 799 |  | 204 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 0 |  | 0 |  |
Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loan balance | 3,326 |  |  | 3,404 |
Accrued interest receivable | 47 |  |  | 23 |
Recorded Investment | $ 3,373 |  |  | $ 3,427 |
[1] | Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH commercial land and development loans is an immaterial amount of consumer loans that are not broken out by class.

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524 + Details
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