| **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: 2013 2012 (dollars in thousands)Commercial, financial, agricultural and other$1,021,056 $1,019,822Real estate construction93,289 87,438Residential real estate1,262,718 1,241,565Commercial real estate1,296,472 1,273,661Loans to individuals610,298 582,218Total loans and leases net of unearned income$4,283,833 $4,204,704                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| Credit Risk Profile by Creditworthiness                                                       | The following tables represent our credit risk profile by creditworthiness category for the years ended December 31: 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 2012 Commercial, financial, agricultural and other Real estate construction Residential real estate Commercial real estate Loans to individuals Total (dollars in thousands)Pass$925,868 $64,353 $1,224,849 $1,119,093 $582,039 $3,916,202Non-Pass           OAEM31,049 925 5,647 82,581 3 120,205Substandard62,905 18,638 11,069 71,987 176 164,775Doubtful— 3,522 — — — 3,522Total Non-Pass93,954 23,085 16,716 154,568 179 288,502Total$1,019,822 $87,438 $1,241,565 $1,273,661 $582,218 $4,204,704                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 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. 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 2012 30 - 59dayspast due 60 - 89dayspastdue 90 daysandgreaterand stillaccruing Nonaccrual Total pastdue andnonaccrual Current Total (dollars in thousands)Commercial, financial, agricultural and other$991 $620 $288 $29,258 $31,157 $988,665 $1,019,822Real estate construction2 19 15 9,778 9,814 77,624 87,438Residential real estate6,597 2,357 730 9,283 18,967 1,222,598 1,241,565Commercial real estate3,339 1,389 195 46,023 50,946 1,222,715 1,273,661Loans to individuals3,140 934 1,219 176 5,469 576,749 582,218Total$14,069 $5,319 $2,447 $94,518 $116,353 $4,088,351 $4,204,704                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| 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, 2013 and 2012. 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, 2013, 2012 and 2011. 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. 2013 Recordedinvestment Unpaidprincipalbalance Relatedallowance Averagerecordedinvestment InterestIncomeRecognized (dollars in thousands)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 Recordedinvestment Unpaidprincipalbalance Relatedallowance Averagerecordedinvestment InterestIncomeRecognized          With no related allowance recorded:         Commercial, financial, agricultural and other$8,080 $8,983   $9,217 $173Real estate construction8,491 35,555   11,912 —Residential real estate7,928 8,401   8,114 72Commercial real estate33,259 35,401   28,574 66Loans to individuals256 256   103 2Subtotal58,014 88,596   57,920 313With an allowance recorded:         Commercial, financial, agricultural and other26,532 27,412 $10,331 21,979 9Real estate construction2,756 3,087 300 1,457 —Residential real estate2,695 2,696 780 1,599 15Commercial real estate17,558 17,896 6,367 5,024 32Loans to individuals— — — — —Subtotal49,541 51,091 17,778 30,059 56Total$107,555 $139,687 $17,778 $87,979 $369 2011 Averagerecordedinvestment InterestIncomeRecognized (dollars in thousands)With no related allowance recorded:   Commercial, financial, agricultural and other$3,887 $20Real estate construction23,254 10Residential real estate2,702 9Commercial real estate35,817 799Loans to individuals10 —Subtotal65,670 838With an allowance recorded:   Commercial, financial, agricultural and other30,456 152Real estate construction14,465 —Residential real estate615 7Commercial real estate28,716 396Loans to individuals— —Subtotal74,252 555Total$139,922 $1,393                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 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: 2013 2012 2011 (dollars in thousands)Troubled debt restructured loans     Accrual status$13,495 $13,037 $20,276Nonaccrual status16,980 50,979 44,841Total$30,475 $64,016 $65,117Commitments     Letters of credit$— $1,574 $12,580Unused lines of credit452 — 42Total$452 $1,574 $12,622                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| 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: 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 2011   Type of Modification         NumberofContracts ExtendMaturity ModifyRate ModifyPayments Other TotalPre-ModificationOutstandingRecordedInvestment Post-ModificationOutstandingRecordedInvestment SpecificReserve (dollars in thousands)Commercial, financial, agricultural and other13 $100 $475 $2,218 $— $2,793 $2,749 $743Real estate construction6 2,554 86 — — 2,640 2,852 —Residential real estate10 — 515 601 — 1,116 1,100 65Commercial real estate22 17,202 24,226 2,311 — 43,739 25,292 507Total51 $19,856 $25,302 $5,130 $— $50,288 $31,993 $1,315                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 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. 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 — 2,989Provision (credit)20,755 (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 — 2,378Provision6,416 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 2011 Commercial,financial,agriculturaland other Real estateconstruction Residentialreal estate Commercialreal estate Loans toindividuals Unallocated Total (dollars in thousands)Allowance for credit losses:             Beginning Balance$21,700 $18,002 $5,454 $16,913 $4,215 $4,945 $71,229Charge-offs(7,114) (28,886) (4,107) (24,861) (3,325) — (68,293)Recoveries473 955 132 349 573 — 2,482Provision (credit)3,141 16,685 6,758 26,560 2,781 (109) 55,816Ending Balance$18,200 $6,756 $8,237 $18,961 $4,244 $4,836 $61,234Ending balance: individually evaluated for impairment$9,069 $2,960 $93 $1,114 $— $— $13,236Ending balance: collectively evaluated for impairment9,131 3,796 8,144 17,847 4,244 4,836 47,998Loans:             Ending balance996,739 76,564 1,137,059 1,267,432 565,849   4,043,643Ending balance: individually evaluated for impairment37,639 14,667 2,606 39,832 —   94,744Ending balance: collectively evaluated for impairment959,100 61,897 1,134,453 1,227,600 565,849   3,948,899 |

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| - Definition
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Schedule of recorded investment and unpaid principal balance for impaired loans with the associated allowance.
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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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