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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 70,127 | $ 78,171 | $ 70,426
Loan balance |  | 5,313,641 |  | 5,271,857
Accrued interest receivable |  | 18,628 |  | 18,822
Recorded Investment |  | 5,328,090 |  | 5,286,830
Impaired Financing Receivable, Average Recorded Investment |  | 67,950 | 78,669 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 811 | 2,396 |
Construction Real Estate Commercial [Domain] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 2,041 | 6,888 |
Loan balance |  | 112,015 |  | 135,343
Accrued interest receivable |  | 338 |  | 398
Recorded Investment |  | 112,353 |  | 135,741
Impaired Financing Receivable, Average Recorded Investment |  | 2,096 | 6,814 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 15 | 13 |
Commercial Financial And Agricultural [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 22,542 | 28,596 |
Impaired Financing Receivable, Average Recorded Investment |  | 19,471 | 29,858 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 220 | 238 |
Construction Real Estate - Mortgage [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 48,193 |  | 48,699
Accrued interest receivable |  | 110 |  | 106
Recorded Investment |  | 48,303 |  | 48,805
Construction Real Estate - Installment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 5,026 |  | 4,903
Accrued interest receivable |  | 14 |  | 17
Recorded Investment |  | 5,040 |  | 4,920
Residential Real Estate - Commercial [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 22,803 | 24,619 |
Loan balance |  | 396,663 |  | 406,687
Accrued interest receivable |  | 924 |  | 940
Recorded Investment |  | 397,587 |  | 407,627
Impaired Financing Receivable, Average Recorded Investment |  | 23,081 | 24,897 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 345 | 1,965 |
Residential Real Estate - Mortgage [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 1,156,543 |  | 1,169,495
Accrued interest receivable |  | 1,246 |  | 1,459
Recorded Investment |  | 1,157,789 |  | 1,170,954
Residential Real Estate - HELOC [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 211,311 |  | 212,441
Accrued interest receivable |  | 820 |  | 853
Recorded Investment |  | 212,131 |  | 213,294
Residential Real Estate - Installment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 18,734 |  | 19,874
Accrued interest receivable |  | 53 |  | 67
Recorded Investment |  | 18,787 |  | 19,941
Loans Receivable [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Accrued interest receivable |  | 14,449 |  | 14,973
Commercial Financial And Agricultural [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | [1] | 995,377 |  | 994,619
Accrued interest receivable | [1] | 3,898 |  | 3,558
Recorded Investment | [1] | 999,275 |  | 998,177
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 22,732 | 18,068 |
Loan balance | [1] | 1,187,395 |  | 1,155,703
Accrued interest receivable | [1] | 3,870 |  | 4,161
Recorded Investment | [1] | 1,191,265 |  | 1,159,864
Impaired Financing Receivable, Average Recorded Investment |  | 23,297 | 17,100 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 231 | $ 180 |
Consumer [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 9 |  |
Loan balance |  | 1,178,736 |  | 1,120,850
Accrued interest receivable |  | 3,118 |  | 3,385
Recorded Investment |  | 1,181,854 |  | 1,124,235
Impaired Financing Receivable, Average Recorded Investment |  | 5 |  |
Leases [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 3,648 |  | 3,243
Accrued interest receivable |  | 58 |  | 29
Recorded Investment |  | $ 3,706 |  | $ 3,272
[1] | Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

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