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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 46,760 | $ 73,609 | $ 46,760 | $ 73,609 | $ 56,564
Loan balance |  | 5,625,323 |  | 5,625,323 |  | 5,372,483
Accrued interest receivable |  | 23,907 |  | 23,907 |  | 22,164
Recorded Investment |  | 5,644,433 |  | 5,644,433 |  | 5,389,142
Impaired Financing Receivable, Average Recorded Investment |  | 54,679 | 72,580 | 52,015 | 68,953 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 485 | 654 | 1,292 | 1,902 |
Construction Real Estate Commercial [Domain] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 2,016 | 1,460 | 2,016 | 1,460 |
Loan balance |  | 151,757 |  | 151,757 |  | 125,389
Accrued interest receivable |  | 474 |  | 474 |  | 401
Recorded Investment |  | 152,231 |  | 152,231 |  | 125,790
Impaired Financing Receivable, Average Recorded Investment |  | 2,246 | 1,554 | 1,661 | 1,830 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 4 | 18 | 31 | 49 |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 16,026 | 29,848 | 16,026 | 29,848 |
Impaired Financing Receivable, Average Recorded Investment |  | 23,247 | 28,412 | 22,686 | 23,770 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 187 | 398 | 506 | 738 |
Construction Real Estate - Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 65,842 |  | 65,842 |  | 52,203
Accrued interest receivable |  | 158 |  | 158 |  | 133
Recorded Investment |  | 66,000 |  | 66,000 |  | 52,336
Construction Real Estate - Installment [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 2,597 |  | 2,597 |  | 3,878
Accrued interest receivable |  | 8 |  | 8 |  | 13
Recorded Investment |  | 2,605 |  | 2,605 |  | 3,891
Residential Real Estate Commercial [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 2,913 | 19,298 | 2,913 | 19,298 |
Loan balance |  | 403,147 |  | 403,147 |  | 393,094
Accrued interest receivable |  | 1,156 |  | 1,156 |  | 1,029
Recorded Investment |  | 404,303 |  | 404,303 |  | 394,123
Impaired Financing Receivable, Average Recorded Investment |  | 2,758 | 20,365 | 6,086 | 20,876 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 26 | 46 | 84 | 452 |
Residential Real Estate - Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 1,140,648 |  | 1,140,648 |  | 1,110,426
Accrued interest receivable |  | 1,719 |  | 1,719 |  | 1,516
Recorded Investment |  | 1,142,367 |  | 1,142,367 |  | 1,111,942
Residential Real Estate - HELOC [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 221,632 |  | 221,632 |  | 203,178
Accrued interest receivable |  | 964 |  | 964 |  | 974
Recorded Investment |  | 222,596 |  | 222,596 |  | 204,152
Residential Real Estate - Installment [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 15,556 |  | 15,556 |  | 18,526
Accrued interest receivable |  | 43 |  | 43 |  | 53
Recorded Investment |  | 15,599 |  | 15,599 |  | 18,579
Loans Receivable [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Accrued interest receivable |  | 19,110 |  | 19,110 |  | 16,659
Commercial Financial And Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance | [1] | 1,031,500 |  | 1,031,500 |  | 1,053,453
Accrued interest receivable | [1] | 5,606 |  | 5,606 |  | 4,413
Recorded Investment | [1] | 1,037,106 |  | 1,037,106 |  | 1,057,866
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 25,805 | 22,995 | 25,805 | 22,995 |
Loan balance | [1] | 1,302,630 |  | 1,302,630 |  | 1,167,607
Accrued interest receivable | [1] | 5,169 |  | 5,169 |  | 4,283
Recorded Investment | [1] | 1,307,799 |  | 1,307,799 |  | 1,171,890
Impaired Financing Receivable, Average Recorded Investment |  | 26,428 | 22,241 | 21,582 | 22,470 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 268 | 192 | 671 | 663 |
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 8 |  | 8 |
Loan balance |  | 1,287,382 |  | 1,287,382 |  | 1,241,736
Accrued interest receivable |  | 3,773 |  | 3,773 |  | 3,808
Recorded Investment |  | 1,291,155 |  | 1,291,155 |  | 1,245,544
Impaired Financing Receivable, Average Recorded Investment |  |  | $ 8 |  | $ 7 |
Leases [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loan balance |  | 2,632 |  | 2,632 |  | 2,993
Accrued interest receivable |  | 40 |  | 40 |  | 36
Recorded Investment |  | $ 2,672 |  | $ 2,672 |  | $ 3,029
[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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