| **Loans and Allowance for Credit Losses (Tables)**                                            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| **Loans and Leases Receivable Disclosure [Abstract]**                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Outstanding Balances of Loan                                                                  | The following table provides outstanding balances related to each of our loan types as of December 31: 2014 2013 (dollars in thousands)Commercial, financial, agricultural and other$1,052,109 $1,021,056Real estate construction120,785 93,289Residential real estate1,226,344 1,262,718Commercial real estate1,405,256 1,296,472Loans to individuals652,814 610,298Total loans and leases net of unearned income$4,457,308 $4,283,833                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Credit Risk Profile by Creditworthiness                                                       | The following tables represent our credit risk profile by creditworthiness category for the years ended December 31: 2014 Commercial, financial, agricultural and other Real estate construction Residential real estate Commercial real estate Loans to individuals Total (dollars in thousands)Pass$983,357 $112,536 $1,214,920 $1,353,773 $652,596 $4,317,182Non-Pass           OAEM32,563 8,013 2,315 29,479 — 72,370Substandard32,028 236 9,109 22,004 218 63,595Doubtful4,161 — — — — 4,161Total Non-Pass68,752 8,249 11,424 51,483 218 140,126Total$1,052,109 $120,785 $1,226,344 $1,405,256 $652,814 $4,457,308 2013 Commercial, financial, agricultural and other Real estate construction Residential real estate Commercial real estate Loans to individuals Total (dollars in thousands)Pass$943,107 $79,679 $1,245,422 $1,243,170 $610,094 $4,121,472Non-Pass           OAEM35,429 9,710 5,161 28,823 1 79,124Substandard42,520 3,900 12,135 24,479 203 83,237Doubtful— — — — — —Total Non-Pass77,949 13,610 17,296 53,302 204 162,361Total$1,021,056 $93,289 $1,262,718 $1,296,472 $610,298 $4,283,833                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Age Analysis of Past Due Loans by Segment                                                     | The following tables delineate the aging analysis of the recorded investments in past due loans as of December 31. Also included in these tables are loans that are 90 days or more past due and still accruing because they are well-secured and in the process of collection. 2014 30 - 59dayspast due 60 - 89dayspastdue 90 daysandgreaterand stillaccruing Nonaccrual Total pastdue andnonaccrual Current Total (dollars in thousands)Commercial, financial, agricultural and other$2,816 $213 $264 $27,007 $30,300 $1,021,809 $1,052,109Real estate construction— 1 — 236 237 120,548 120,785Residential real estate5,162 1,295 1,077 7,900 15,434 1,210,910 1,226,344Commercial real estate1,797 122 — 7,306 9,225 1,396,031 1,405,256Loans to individuals3,698 1,059 1,278 218 6,253 646,561 652,814Total$13,473 $2,690 $2,619 $42,667 $61,449 $4,395,859 $4,457,308 2013 30 - 59dayspast due 60 - 89dayspastdue 90 daysandgreaterand stillaccruing Nonaccrual Total pastdue andnonaccrual Current Total (dollars in thousands)Commercial, financial, agricultural and other$594 $319 $185 $23,631 $24,729 $996,327 $1,021,056Real estate construction— — — 2,567 2,567 90,722 93,289Residential real estate4,002 524 1,041 10,520 16,087 1,246,631 1,262,718Commercial real estate1,199 23 13 8,966 10,201 1,286,271 1,296,472Loans to individuals2,895 990 1,266 204 5,355 604,943 610,298Total$8,690 $1,856 $2,505 $45,888 $58,939 $4,224,894 $4,283,833                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance | The following tables include the recorded investment and unpaid principal balance for impaired loans with the associated allowance amount, if applicable, as of December 31, 2014 and 2013. Also presented are the average recorded investment in impaired loans and the related amount of interest recognized while the loan was considered impaired for the years ended December 31, 2014, 2013 and 2012. Average balances are calculated based on month-end balances of the loans for the period reported and are included in the table below based on its period end allowance position. 2014 Recordedinvestment Unpaidprincipalbalance Relatedallowance Averagerecordedinvestment InterestIncomeRecognized (dollars in thousands)With no related allowance recorded:         Commercial, financial, agricultural and other$9,439 $10,937   $11,536 $133Real estate construction236 476   1,190 19Residential real estate10,773 12,470   11,592 210Commercial real estate8,768 10,178   8,830 98Loans to individuals288 337   308 4Subtotal29,504 34,398   33,456 464With an allowance recorded:         Commercial, financial, agricultural and other24,826 25,583 $9,304 15,797 143Real estate construction— — — — —Residential real estate367 380 56 357 14Commercial real estate554 554 101 184 4Loans to individuals— — — — —Subtotal25,747 26,517 9,461 16,338 161Total$55,251 $60,915 $9,461 $49,794 $625 2013 Recordedinvestment Unpaidprincipalbalance Relatedallowance Averagerecordedinvestment InterestIncomeRecognized          With no related allowance recorded:         Commercial, financial, agricultural and other$6,752 $7,649   $14,454 $73Real estate construction3,486 6,664   5,923 47Residential real estate9,333 9,952   9,280 211Commercial real estate13,606 14,719   27,881 250Loans to individuals289 307   255 3Subtotal33,466 39,291   57,793 584With an allowance recorded:         Commercial, financial, agricultural and other21,482 22,082 $7,364 16,479 64Real estate construction414 737 94 515 —Residential real estate3,533 3,585 1,282 3,200 31Commercial real estate488 612 84 188 —Loans to individuals— — — — —Subtotal25,917 27,016 8,824 20,382 95Total$59,383 $66,307 $8,824 $78,175 $679 2012 Averagerecordedinvestment InterestIncomeRecognized (dollars in thousands)With no related allowance recorded:   Commercial, financial, agricultural and other$9,217 $173Real estate construction11,912 —Residential real estate8,114 72Commercial real estate28,574 66Loans to individuals103 2Subtotal57,920 313With an allowance recorded:   Commercial, financial, agricultural and other21,979 9Real estate construction1,457 —Residential real estate1,599 15Commercial real estate5,024 32Loans to individuals— —Subtotal30,059 56Total$87,979 $369                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Troubled Debt Restructured Loans and Commitments                                              | The following table provides detail as to the total troubled debt restructured loans and total commitments outstanding on troubled debt restructured loans as of December 31: 2014 2013 2012 (dollars in thousands)Troubled debt restructured loans     Accrual status$12,584 $13,495 $13,037Nonaccrual status16,952 16,980 50,979Total$29,536 $30,475 $64,016Commitments     Letters of credit$— $— $1,574Unused lines of credit4,120 452 —Total$4,120 $452 $1,574                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Troubled Debt Restructurings is 90 Days or More Past Due                                      | he following tables provide detail, including specific reserve and reasons for modification, related to loans identified as troubled debt restructurings during the years ending December 31: 2014   Type of Modification        NumberofContracts ExtendMaturity ModifyRate ModifyPayments  TotalPre-ModificationOutstandingRecordedInvestment Post-ModificationOutstandingRecordedInvestment SpecificReserve (dollars in thousands)Commercial, financial, agricultural and other9 $5,487 $— $14,529  $20,016 $13,785 $4,665Residential real estate52 — 629 1,797  2,426 2,062 —Commercial real estate1 — — 8  8 6 —Loans to individuals15 — 103 47  150 114 —Total77 $5,487 $732 $16,381  $22,600 $15,967 $4,665  2013   Type of Modification         NumberofContracts ExtendMaturity ModifyRate ModifyPayments Other TotalPre-ModificationOutstandingRecordedInvestment Post-ModificationOutstandingRecordedInvestment SpecificReserve (dollars in thousands)Commercial, financial, agricultural and other14 $3,462 $— $1,677 $— $5,139 $3,104 $906Residential real estate46 347 418 2,116 — 2,881 2,316 161Commercial real estate5 571 1,499 145 — 2,215 2,184 34Loans to individuals17 10 101 33 — 144 109 —Total82 $4,390 $2,018 $3,971 $— $10,379 $7,713 $1,101 2012   Type of Modification         NumberofContracts ExtendMaturity ModifyRate ModifyPayments Other TotalPre-ModificationOutstandingRecordedInvestment Post-ModificationOutstandingRecordedInvestment SpecificReserve (dollars in thousands)Commercial, financial, agricultural and other12 $1,599 $187 $9,476 $— $11,262 $11,335 $4,237Real estate construction2 1,697 — — — 1,697 2,133 200Residential real estate25 200 132 697 48 1,077 973 69Commercial real estate4 3,280 4,308 71 — 7,659 7,607 409Loans to individuals17 — 97 88 6 191 173 —Total60 $6,776 $4,724 $10,332 $54 $21,886 $22,221 $4,915                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Allowance for Credit Losses                                                                   | The following tables provide detail related to the allowance for credit losses for the years ended December 31.  During 2013, the negative $5.9 million provision for credit losses related to the unallocated portion of the allowance is a result of it no longer being treated as a separate component of the allowance but instead is now incorporated into the reserve provided for each loan category. This portion of the allowance for credit losses reflects the qualitative or environmental factors that are likely to cause estimated credit losses to differ from historical loss experience. 2014 Commercial,financial,agriculturaland other Real estateconstruction Residentialreal estate Commercialreal estate Loans toindividuals Total (dollars in thousands)Allowance for credit losses:           Beginning Balance$22,663 $6,600 $7,727 $11,778 $5,457 $54,225Charge-offs(8,911) (296) (3,153) (1,148) (3,964) (17,472)Recoveries734 1,340 650 612 766 4,102Provision (credit)15,141 (5,581) (1,560) 639 2,557 11,196Ending Balance$29,627 $2,063 $3,664 $11,881 $4,816 $52,051Ending balance: individually evaluated for impairment$9,304 $— $56 $101 $— $9,461Ending balance: collectively evaluated for impairment20,323 2,063 3,608 11,780 4,816 42,590Loans:           Ending balance1,052,109 120,785 1,226,344 1,405,256 652,814 4,457,308Ending balance: individually evaluated for impairment33,332 193 7,127 7,790 — 48,442Ending balance: collectively evaluated for impairment1,018,777 120,592 1,219,217 1,397,466 652,814 4,408,866 2013 Commercial,financial,agriculturaland other Real estateconstruction Residentialreal estate Commercialreal estate Loans toindividuals Unallocated Total (dollars in thousands)Allowance for credit losses:             Beginning Balance$19,852 $8,928 $5,908 $22,441 $4,132 $5,926 $67,187Charge-offs(18,399) (773) (1,814) (10,513) (3,679) — (35,178)Recoveries455 501 1,264 136 633 — 2,989Provision20,755 (2,056) 2,369 (286) 4,371 (5,926) 19,227Ending Balance$22,663 $6,600 $7,727 $11,778 $5,457 $— $54,225Ending balance: individually evaluated for impairment$7,364 $94 $1,282 $84 $— $— $8,824Ending balance: collectively evaluated for impairment15,299 6,506 6,445 11,694 5,457 — 45,401Loans:             Ending balance1,021,056 93,289 1,262,718 1,296,472 610,298   4,283,833Ending balance: individually evaluated for impairment27,251 3,844 9,349 12,151 —   52,595Ending balance: collectively evaluated for impairment993,805 89,445 1,253,369 1,284,321 610,298   4,231,238 2012 Commercial,financial,agriculturaland other Real estateconstruction Residentialreal estate Commercialreal estate Loans toindividuals Unallocated Total (dollars in thousands)Allowance for credit losses:             Beginning Balance$18,200 $6,756 $8,237 $18,961 $4,244 $4,836 $61,234Charge-offs(5,207) (3,601) (3,828) (851) (3,482) — (16,969)Recoveries443 582 422 410 521 — 2,378Provision (credit)6,416 5,191 1,077 3,921 2,849 1,090 20,544Ending Balance$19,852 $8,928 $5,908 $22,441 $4,132 $5,926 $67,187Ending balance: individually evaluated for impairment$10,331 $300 $780 $6,367 $— $— $17,778Ending balance: collectively evaluated for impairment9,521 8,628 5,128 16,074 4,132 5,926 49,409Loans:             Ending balance1,019,822 87,438 1,241,565 1,273,661 582,218   4,204,704Ending balance: individually evaluated for impairment33,443 11,177 6,444 49,123 —   100,187Ending balance: collectively evaluated for impairment986,379 76,261 1,235,121 1,224,538 582,218   4,104,517 |

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| - Definition
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| - Definition
Schedule of recorded investment and unpaid principal balance for impaired loans with the associated allowance.
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No definition available.
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| - Definition
Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account.
+ References
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| - Definition
Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.
+ References
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| - Definition
Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status.
+ References
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| - Definition
Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.
+ References
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| - Definition
Tabular disclosure of financing receivables and troubled debt restructurings.
+ References
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