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Loans (Aging Of Recorded Investment In Past Due Loans) (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, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | $ 28,276 |  |  | $ 28,276 |  |  | $ 25,241 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 18,161 | [1] |  | 18,161 | [1] |  | 17,776 | [2]
Total loans past due |  | 46,437 |  |  | 46,437 |  |  | 43,017 |
Total current |  | 5,597,996 |  |  | 5,597,996 |  |  | 5,346,125 |
Recorded Investment |  | 5,644,433 |  |  | 5,644,433 |  |  | 5,389,142 |
Loans past due 90 days or more and accruing |  | 2,083 |  |  | 2,083 |  |  | 1,845 |
Impaired Financing Receivable, Recorded Investment, Nonaccrual loans which are current in regards to contractual P&I payments |  | 50,100 |  |  | 50,100 |  |  | 56,100 |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 3,704 |  | $ 4,938 | 6,566 |  | $ 10,765 |  |
Construction Real Estate Commercial [Domain] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  |  |  |  |  |  |  | 29 |
Past due nonaccrual loans and loans past due 90 days or more and accruing | [1] | 1,837 |  |  | 1,837 |  |  |  |
Total loans past due |  | 1,837 |  |  | 1,837 |  |  | 29 |
Total current |  | 150,394 |  |  | 150,394 |  |  | 125,761 |
Recorded Investment |  | 152,231 |  |  | 152,231 |  |  | 125,790 |
Loans past due 90 days or more and accruing |  | 0 |  |  | 0 |  |  | 0 |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 2,769 |  |  | 2,769 |  |  | 145 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 1,817 | [1] |  | 1,817 | [1] |  | 1,043 | [2]
Total loans past due |  | 4,586 |  |  | 4,586 |  |  | 1,188 |
Total current |  | 1,032,520 |  |  | 1,032,520 |  |  | 1,056,678 |
Loans past due 90 days or more and accruing |  | 16 |  |  | 16 |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 574 |  | 1,415 | 800 |  | 4,169 |  |
Construction Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 241 |  |  | 241 |  |  | 256 |
Total loans past due |  | 241 |  |  | 241 |  |  | 256 |
Total current |  | 65,759 |  |  | 65,759 |  |  | 52,080 |
Recorded Investment |  | 66,000 |  |  | 66,000 |  |  | 52,336 |
Loans past due 90 days or more and accruing |  | 0 |  |  | 0 |  |  | 0 |
Financing Receivable, Modifications, Recorded Investment, During Period |  |  |  |  |  |  | 8 |  |
Construction Real Estate - Installment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 179 |  |  | 179 |  |  | 54 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 21 | [1] |  | 21 | [1] |  | 19 | [2]
Total loans past due |  | 200 |  |  | 200 |  |  | 73 |
Total current |  | 2,405 |  |  | 2,405 |  |  | 3,818 |
Recorded Investment |  | 2,605 |  |  | 2,605 |  |  | 3,891 |
Loans past due 90 days or more and accruing |  | 0 |  |  | 0 |  |  | 0 |
Financing Receivable, Modifications, Recorded Investment, During Period |  |  |  |  | 12 |  |  |  |
Residential Real Estate Commercial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 79 |  |  | 79 |  |  | 16 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 1,268 | [1] |  | 1,268 | [1] |  | 1,586 | [2]
Total loans past due |  | 1,347 |  |  | 1,347 |  |  | 1,602 |
Total current |  | 402,956 |  |  | 402,956 |  |  | 392,521 |
Recorded Investment |  | 404,303 |  |  | 404,303 |  |  | 394,123 |
Loans past due 90 days or more and accruing |  | 0 |  |  | 0 |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 304 |  | 498 | 304 |  | 702 |  |
Residential Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 13,669 |  |  | 13,669 |  |  | 11,515 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 8,241 | [1] |  | 8,241 | [1] |  | 9,232 | [2]
Total loans past due |  | 21,910 |  |  | 21,910 |  |  | 20,747 |
Total current |  | 1,120,457 |  |  | 1,120,457 |  |  | 1,091,195 |
Recorded Investment |  | 1,142,367 |  |  | 1,142,367 |  |  | 1,111,942 |
Loans past due 90 days or more and accruing |  | 720 |  |  | 720 |  |  | 568 |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 246 |  | 417 | 1,062 |  | 1,669 |  |
Residential Real Estate - HELOC [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 749 |  |  | 749 |  |  | 616 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 1,089 | [1] |  | 1,089 | [1] |  | 876 | [2]
Total loans past due |  | 1,838 |  |  | 1,838 |  |  | 1,492 |
Total current |  | 220,758 |  |  | 220,758 |  |  | 202,660 |
Recorded Investment |  | 222,596 |  |  | 222,596 |  |  | 204,152 |
Loans past due 90 days or more and accruing |  | 144 |  |  | 144 |  |  | 14 |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 469 |  | 168 | 860 |  | 529 |  |
Residential Real Estate - Installment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 273 |  |  | 273 |  |  | 239 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 212 | [1] |  | 212 | [1] |  | 253 | [2]
Total loans past due |  | 485 |  |  | 485 |  |  | 492 |
Total current |  | 15,114 |  |  | 15,114 |  |  | 18,087 |
Recorded Investment |  | 15,599 |  |  | 15,599 |  |  | 18,579 |
Loans past due 90 days or more and accruing |  | 0 |  |  | 0 |  |  | 7 |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 336 |  | 151 | 453 |  | 216 |  |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Recorded Investment | [3] | 1,037,106 |  |  | 1,037,106 |  |  | 1,057,866 |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 96 |  |  | 96 |  |  | 856 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 1,425 | [1] |  | 1,425 | [1] |  | 2,360 | [2]
Total loans past due |  | 1,521 |  |  | 1,521 |  |  | 3,216 |
Total current |  | 1,306,278 |  |  | 1,306,278 |  |  | 1,168,674 |
Recorded Investment | [3] | 1,307,799 |  |  | 1,307,799 |  |  | 1,171,890 |
Loans past due 90 days or more and accruing |  | 0 |  |  | 0 |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 1,154 |  | 1,455 | 1,859 |  | 2,320 |  |
Consumer [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 10,221 |  |  | 10,221 |  |  | 11,515 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 2,251 | [1] |  | 2,251 | [1] |  | 2,407 | [2]
Total loans past due |  | 12,472 |  |  | 12,472 |  |  | 13,922 |
Total current |  | 1,278,683 |  |  | 1,278,683 |  |  | 1,231,622 |
Recorded Investment |  | 1,291,155 |  |  | 1,291,155 |  |  | 1,245,544 |
Loans past due 90 days or more and accruing |  | 1,203 |  |  | 1,203 |  |  | 1,256 |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 621 |  | 834 | 1,216 |  | 1,152 |  |
Leases [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Accruing loans past due 30-89 days |  | 0 |  |  | 0 |  |  | 0 |
Past due nonaccrual loans and loans past due 90 days or more and accruing |  | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Total loans past due |  | 0 |  |  | 0 |  |  | 0 |
Total current |  | 2,672 |  |  | 2,672 |  |  | 3,029 |
Recorded Investment |  | 2,672 |  |  | 2,672 |  |  | $ 3,029 |
Accruing Financing Receivable Modifications [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 897 |  | 2,061 | 2,043 |  | 3,608 |  |
Accruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 22 |  | 400 | 208 |  | 400 |  |
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 0 |  | 0 | 0 |  | 0 |  |
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Installment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 0 |  | 0 | 12 |  | 0 |  |
Accruing Financing Receivable Modifications [Member] | Residential Real Estate Commercial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 55 |  | 144 | 55 |  | 144 |  |
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 0 |  | 211 | 90 |  | 746 |  |
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 453 |  | 123 | 735 |  | 478 |  |
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 336 |  | 110 | 437 |  | 175 |  |
Accruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  |  |  | 974 | 447 |  | 1,525 |  |
Accruing Financing Receivable Modifications [Member] | Consumer [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 31 |  | 99 | 59 |  | 140 |  |
Nonaccruing Financing Receivable Modifications [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 2,807 |  | 2,877 | 4,523 |  | 7,157 |  |
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 552 |  | 1,015 | 592 |  | 3,769 |  |
Nonaccruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  |  |  |  |  |  | 8 |  |
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate Commercial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 249 |  | 354 | 249 |  | 558 |  |
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 246 |  | 206 | 972 |  | 923 |  |
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 16 |  | 45 | 125 |  | 51 |  |
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  |  |  | 41 | 16 |  | 41 |  |
Nonaccruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | 1,154 |  | 481 | 1,412 |  | 795 |  |
Nonaccruing Financing Receivable Modifications [Member] | Consumer [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment, During Period |  | $ 590 |  | $ 735 | $ 1,157 |  | $ 1,012 |  |
[1] | 1) Includes $2.1 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans.(2) Includes $50.1 million of nonaccrual loans which were current in regards to contractual principal and interest payments
[2] | 1) Includes $1.8 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans.(2) Includes $56.1 million of nonaccrual loans which were current in regards to contractual principal and interest payments.
[3] | 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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