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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 73,609 | $ 77,998 | $ 73,609 | $ 77,998 | $ 70,426
Loan balance |  | 5,365,877 |  | 5,365,877 |  | 5,271,857
Accrued interest receivable |  | 21,246 |  | 21,246 |  | 18,822
Recorded Investment |  | 5,382,343 |  | 5,382,343 |  | 5,286,830
Impaired Financing Receivable, Average Recorded Investment |  | 72,580 | 84,736 | 68,953 | 81,191 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 654 | 767 | 1,902 | 4,011 |
Construction Real Estate Commercial [Domain] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 1,460 | 4,377 | 1,460 | 4,377 |
Loan balance |  | 139,210 |  | 139,210 |  | 135,343
Accrued interest receivable |  | 462 |  | 462 |  | 398
Recorded Investment |  | 139,672 |  | 139,672 |  | 135,741
Impaired Financing Receivable, Average Recorded Investment |  | 1,554 | 5,643 | 1,830 | 6,244 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 18 | 16 | 49 | 44 |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 29,848 | 23,856 | 29,848 | 23,856 |
Impaired Financing Receivable, Average Recorded Investment |  | 28,412 | 26,679 | 23,770 | 28,217 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 398 | 194 | 738 | 740 |
Construction Real Estate - Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 47,629 |  | 47,629 |  | 48,699
Accrued interest receivable |  | 109 |  | 109 |  | 106
Recorded Investment |  | 47,738 |  | 47,738 |  | 48,805
Construction Real Estate - Installment [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 4,209 |  | 4,209 |  | 4,903
Accrued interest receivable |  | 11 |  | 11 |  | 17
Recorded Investment |  | 4,220 |  | 4,220 |  | 4,920
Residential Real Estate - Commercial [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 19,298 | 23,700 | 19,298 | 23,700 |
Loan balance |  | 391,502 |  | 391,502 |  | 406,687
Accrued interest receivable |  | 959 |  | 959 |  | 940
Recorded Investment |  | 392,461 |  | 392,461 |  | 407,627
Impaired Financing Receivable, Average Recorded Investment |  | 20,365 | 24,422 | 20,876 | 24,618 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 46 | 314 | 452 | 2,619 |
Residential Real Estate - Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 1,135,289 |  | 1,135,289 |  | 1,169,495
Accrued interest receivable |  | 1,469 |  | 1,469 |  | 1,459
Recorded Investment |  | 1,136,758 |  | 1,136,758 |  | 1,170,954
Residential Real Estate - HELOC [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 206,665 |  | 206,665 |  | 212,441
Accrued interest receivable |  | 896 |  | 896 |  | 853
Recorded Investment |  | 207,561 |  | 207,561 |  | 213,294
Residential Real Estate - Installment [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 19,131 |  | 19,131 |  | 19,874
Accrued interest receivable |  | 54 |  | 54 |  | 67
Recorded Investment |  | 19,185 |  | 19,185 |  | 19,941
Loans Receivable [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Accrued interest receivable |  | 16,466 |  | 16,466 |  | 14,973
Commercial Financial And Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance | [1] | 1,025,057 |  | 1,025,057 |  | 994,619
Accrued interest receivable | [1] | 4,581 |  | 4,581 |  | 3,558
Recorded Investment | [1] | 1,029,638 |  | 1,029,638 |  | 998,177
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 22,995 | 26,065 | 22,995 | 26,065 |
Loan balance | [1] | 1,155,662 |  | 1,155,662 |  | 1,155,703
Accrued interest receivable | [1] | 4,464 |  | 4,464 |  | 4,161
Recorded Investment | [1] | 1,160,126 |  | 1,160,126 |  | 1,159,864
Impaired Financing Receivable, Average Recorded Investment |  | 22,241 | 27,982 | 22,470 | 22,108 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 192 | 243 | 663 | 608 |
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 8 |  | 8 |  |
Loan balance |  | 1,238,191 |  | 1,238,191 |  | 1,120,850
Accrued interest receivable |  | 3,409 |  | 3,409 |  | 3,385
Recorded Investment |  | 1,241,600 |  | 1,241,600 |  | 1,124,235
Impaired Financing Receivable, Average Recorded Investment |  | 8 | $ 10 | 7 | $ 4 |
Leases [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 3,332 |  | 3,332 |  | 3,243
Accrued interest receivable |  | 52 |  | 52 |  | 29
Recorded Investment |  | $ 3,384 |  | $ 3,384 |  | $ 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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