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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 126,102 |  | $ 169,690 | $ 126,102 |  | $ 169,690 | $ 137,339 |
Loan balance | 4,510,716 |  |  | 4,510,716 |  |  | 4,450,322 |
Accrued interest receivable | 14,121 |  |  | 14,121 |  |  | 13,587 |
Recorded Investment | 4,524,837 |  |  | 4,524,837 |  |  | 4,463,909 |
Impaired Financing Receivable, Average Recorded Investment | 127,057 |  | 174,963 | 130,405 |  | 177,738 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 645 |  | 817 | 1,379 |  | 1,420 |  |
Commercial, Financial And Agricultural [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 20,154 |  | 41,591 | 20,154 |  | 41,591 |  |
Recorded Investment | 809,893 |  |  | 809,893 |  |  | 826,903 |
Impaired Financing Receivable, Average Recorded Investment | 21,148 |  | 42,056 | 21,252 |  | 41,218 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 82 |  | 205 | 210 |  | 310 |  |
Construction Real Estate - Vision/SEPH Commercial Land And Development [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 9,074 |  | 17,272 | 9,074 |  | 17,272 |  |
Loan balance | 10,217 | [1] |  | 10,217 | [1] |  | 15,105 | [1]
Accrued interest receivable | 21 | [1] |  | 21 | [1] |  | 37 | [1]
Recorded Investment | 10,238 | [1] |  | 10,238 | [1] |  | 15,142 | [1]
Impaired Financing Receivable, Average Recorded Investment | 9,532 |  | 18,412 | 10,854 |  | 20,302 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  |  |  |  |  |  |  |
Construction Real Estate - Remaining Commercial [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 18,535 |  | 29,562 | 18,535 |  | 29,562 |  |
Loan balance | 113,443 |  |  | 113,443 |  |  | 115,473 |
Accrued interest receivable | 281 |  |  | 281 |  |  | 331 |
Recorded Investment | 113,724 |  |  | 113,724 |  |  | 115,804 |
Impaired Financing Receivable, Average Recorded Investment | 19,390 |  | 31,428 | 20,103 |  | 28,899 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 192 |  | 199 | 412 |  | 450 |  |
Construction Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Loan balance | 24,570 |  |  | 24,570 |  |  | 26,373 |
Accrued interest receivable | 75 |  |  | 75 |  |  | 81 |
Recorded Investment | 24,645 |  |  | 24,645 |  |  | 26,454 |
Construction Real Estate - Installment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Loan balance | 7,638 |  |  | 7,638 |  |  | 8,577 |
Accrued interest receivable | 28 |  |  | 28 |  |  | 33 |
Recorded Investment | 7,666 |  |  | 7,666 |  |  | 8,610 |
Residential Real Estate - Commercial [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 35,412 |  | 37,277 | 35,412 |  | 37,277 |  |
Loan balance | 400,540 |  |  | 400,540 |  |  | 392,203 |
Accrued interest receivable | 1,008 |  |  | 1,008 |  |  | 959 |
Recorded Investment | 401,548 |  |  | 401,548 |  |  | 393,162 |
Impaired Financing Receivable, Average Recorded Investment | 36,141 |  | 40,359 | 35,897 |  | 41,541 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 112 |  | 125 | 242 |  | 165 |  |
Residential Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Loan balance | 1,091,874 |  |  | 1,091,874 |  |  | 1,064,787 |
Accrued interest receivable | 2,028 |  |  | 2,028 |  |  | 1,399 |
Recorded Investment | 1,093,902 |  |  | 1,093,902 |  |  | 1,066,186 |
Residential Real Estate - HELOC [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Loan balance | 209,902 |  |  | 209,902 |  |  | 212,905 |
Accrued interest receivable | 841 |  |  | 841 |  |  | 892 |
Recorded Investment | 210,743 |  |  | 210,743 |  |  | 213,797 |
Residential Real Estate - Installment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Loan balance | 38,446 |  |  | 38,446 |  |  | 43,750 |
Accrued interest receivable | 144 |  |  | 144 |  |  | 176 |
Recorded Investment | 38,590 |  |  | 38,590 |  |  | 43,926 |
Commercial, Financial And Agricultural [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Loan balance | 806,709 | [1] |  | 806,709 | [1] |  | 823,927 | [1]
Accrued interest receivable | 3,184 | [1] |  | 3,184 | [1] |  | 2,976 | [1]
Recorded Investment | 809,893 | [1] |  | 809,893 | [1] |  | 826,903 | [1]
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 42,128 |  | 43,969 | 42,128 |  | 43,969 |  |
Loan balance | 1,113,251 | [1] |  | 1,113,251 | [1] |  | 1,092,164 | [1]
Accrued interest receivable | 3,689 | [1] |  | 3,689 | [1] |  | 3,839 | [1]
Recorded Investment | 1,116,940 | [1] |  | 1,116,940 | [1] |  | 1,096,003 | [1]
Impaired Financing Receivable, Average Recorded Investment | 40,047 |  | 42,689 | 41,840 |  | 45,758 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 259 |  | 287 | 515 |  | 494 |  |
Consumer [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 799 |  | 19 | 799 |  | 19 |  |
Loan balance | 690,892 |  |  | 690,892 |  |  | 651,930 |
Accrued interest receivable | 2,794 |  |  | 2,794 |  |  | 2,835 |
Recorded Investment | 693,686 |  |  | 693,686 |  |  | 654,765 |
Impaired Financing Receivable, Average Recorded Investment | 799 |  | 19 | 459 |  | 20 |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  |  | 1 |  |  | 1 |  |
Leases [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |
Loan balance | 3,234 |  |  | 3,234 |  |  | 3,128 |
Accrued interest receivable | 28 |  |  | 28 |  |  | 29 |
Recorded Investment | $ 3,262 |  |  | $ 3,262 |  |  | $ 3,157 |
[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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