| **Loans and Allowance for Credit Losses (Tables)**                                            | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
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| **Loans and Leases Receivable Disclosure [Abstract]**                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Outstanding Balances of Loan                                                                  | The following table provides outstanding balances related to each of our loan types:  June 30, 2014 December 31, 2013 (dollars in thousands)Commercial, financial, agricultural and other$1,062,001 $1,021,056Real estate construction100,709 93,289Residential real estate1,238,791 1,262,718Commercial real estate1,306,752 1,296,472Loans to individuals625,961 610,298Total loans and leases net of unearned income$4,334,214 $4,283,833                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Credit Risk Profile by Creditworthiness                                                       | The following tables represent our credit risk profile by creditworthiness: June 30, 2014 Commercial, financial, agricultural and other Real estate construction Residential real estate Commercial real estate Loans to individuals Total (dollars in thousands)Pass$976,591 $91,732 $1,225,291 $1,257,512 $625,718 $4,176,844Non-Pass           OAEM46,934 8,310 3,160 28,800 — 87,204Substandard34,198 667 10,340 20,440 243 65,888Doubtful4,278 — — — — 4,278Total Non-Pass85,410 8,977 13,500 49,240 243 157,370Total$1,062,001 $100,709 $1,238,791 $1,306,752 $625,961 $4,334,214  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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| 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 June 30, 2014 and December 31, 2013. 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.  June 30, 2014 30 - 59dayspast due 60 - 89dayspastdue 90 daysandgreaterand stillaccruing Nonaccrual Total pastdue andnonaccrual Current Total (dollars in thousands)Commercial, financial, agricultural and other$687 $173 $230 $19,678 $20,768 $1,041,233 $1,062,001Real estate construction— — — 303 303 100,406 100,709Residential real estate4,649 1,222 891 8,734 15,496 1,223,295 1,238,791Commercial real estate956 4,163 — 6,764 11,883 1,294,869 1,306,752Loans to individuals2,553 1,096 1,289 242 5,180 620,781 625,961Total$8,845 $6,654 $2,410 $35,721 $53,630 $4,280,584 $4,334,214  December 31, 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 June 30, 2014 and December 31, 2013. Also presented are the average recorded investment in impaired loans and the related amount of interest recognized while the loan was considered impaired. Average balances are calculated using month-end balances of the loans for the period reported and are included in the table below based on its period-end allowance position.  June 30, 2014 December 31, 2013 Recordedinvestment Unpaidprincipalbalance Relatedallowance Recordedinvestment Unpaidprincipalbalance Relatedallowance (dollars in thousands)With no related allowance recorded:           Commercial, financial, agricultural and other$7,422 $8,585  $6,752 $7,649 Real estate construction586 1,154  3,486 6,664 Residential real estate9,102 10,183  9,333 9,952 Commercial real estate7,366 8,379  13,606 14,719 Loans to individuals341 373  289 307 Subtotal24,817 28,674  33,466 39,291 With an allowance recorded:           Commercial, financial, agricultural and other17,994 18,422 4,995 21,482 22,082 7,364Real estate construction— — — 414 737 94Residential real estate1,940 2,085 546 3,533 3,585 1,282Commercial real estate1,536 1,673 531 488 612 84Loans to individuals— — — — — —Subtotal21,470 22,180 6,072 25,917 27,016 8,824Total$46,287 $50,854 $6,072 $59,383 $66,307 $8,824  For the Six Months Ended June 30, 2014 2013 Averagerecordedinvestment InterestIncomeRecognized Averagerecordedinvestment InterestIncomeRecognized (dollars in thousands)With no related allowance recorded:       Commercial, financial, agricultural and other$13,841 $32 $12,333 $106Real estate construction2,112 18 6,900 —Residential real estate10,602 124 8,732 78Commercial real estate8,494 55 27,867 25Loans to individuals290 2 246 2Subtotal35,339 231 56,078 211With an allowance recorded:       Commercial, financial, agricultural and other14,333 76 20,534 31Real estate construction— — 2,017 26Residential real estate1,738 15 3,117 12Commercial real estate670 2 5,760 52Loans to individuals— — — —Subtotal16,741 93 31,428 121Total$52,080 $324 $87,506 $332 For the Three Months Ended June 30, 2014 2013 Averagerecordedinvestment InterestIncomeRecognized Averagerecordedinvestment InterestIncomeRecognized (dollars in thousands)With no related allowance recorded:       Commercial, financial, agricultural and other$12,658 $14 $12,853 $55Real estate construction1,148 6 5,538 —Residential real estate9,858 75 9,003 41Commercial real estate7,388 22 20,865 13Loans to individuals310 1 246 1Subtotal31,362 118 48,505 110With an allowance recorded:       Commercial, financial, agricultural and other15,086 32 18,486 12Real estate construction— — 1,733 14Residential real estate1,836 7 3,680 8Commercial real estate1,136 1 5,708 28Loans to individuals— — — —Subtotal18,058 40 29,607 62Total$49,420 $158 $78,112 $172                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 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: June 30, 2014 December 31, 2013 (dollars in thousands)Troubled debt restructured loans   Accrual status$10,566 $13,495Nonaccrual status6,793 16,980Total$17,359 $30,475Commitments   Letters of credit$— $—Unused lines of credit2,482 452Total$2,482 $452                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Troubled Debt Restructurings is 90 days or more past due                                      |  For the Three Months Ended June 30, 2014   Type of Modification       NumberofContracts ExtendMaturity ModifyRate ModifyPayments TotalPre-ModificationOutstandingRecordedInvestment Post-ModificationOutstandingRecordedInvestment SpecificReserve (dollars in thousands)Commercial, financial, agricultural and other1 $1,420 $— $— $1,420 $1,433 $—Residential real estate8 — 120 126 246 243 2Loans to individuals4 — 42 7 49 42 —Total13 $1,420 $162 $133 $1,715 $1,718 $2 For the Three Months Ended, June 30, 2013   Type of Modification       NumberofContracts ExtendMaturity ModifyRate ModifyPayments TotalPre-ModificationOutstandingRecordedInvestment Post-ModificationOutstandingRecordedInvestment SpecificReserve (dollars in thousands)Commercial, financial, agricultural and other1 $100 $— $— $100 $100 $100Residential real estate13 273 113 769 1,155 1,132 562Loans to individuals2 — 10 3 13 9 —Total16 $373 $123 $772 $1,268 $1,241 $662The following tables provide detail, including specific reserves and reasons for modification, related to loans identified as troubled debt restructurings: For the Six Months Ended June 30, 2014   Type of Modification       NumberofContracts ExtendMaturity ModifyRate ModifyPayments TotalPre-ModificationOutstandingRecordedInvestment Post-ModificationOutstandingRecordedInvestment SpecificReserve (dollars in thousands)Commercial, financial, agricultural and other2 $1,480 $— $— $1,480 $1,463 $20Residential real estate21 — 291 644 935 895 48Commercial real estate1 — — 12 12 7 —Loans to individuals10 — 73 27 100 85 —Total34 $1,480 $364 $683 $2,527 $2,450 $68 For the Six Months Ended June 30, 2013   Type of Modification       NumberofContracts ExtendMaturity ModifyRate ModifyPayments TotalPre-ModificationOutstandingRecordedInvestment Post-ModificationOutstandingRecordedInvestment SpecificReserve (dollars in thousands)Commercial, financial, agricultural and other3 $526 $— $12 $538 $472 $100Residential real estate22 280 326 1,284 1,890 1,801 562Commercial real estate1 — 244 — 244 237 —Loans to individuals6 — 34 6 40 29 —Total32 $806 $604 $1,302 $2,712 $2,539 $662                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Troubled Debt Restructuring Identified During Period                                          | The following table provides information related to restructured loans that were considered to default during the six months endedJune 30:  2014 2013 Number ofContracts RecordedInvestment Number ofContracts RecordedInvestment (dollars in thousands)Residential real estate2 $51 1 $9Loans to individuals— — 3 9Total2 $51 4 $18 A troubled debt restructuring is considered to be in default when a restructured loan is 90 days or more past due.  The following table provides information related to restructured loans that were considered to default during the three months endedJune 30:  2014 2013 Number ofContracts RecordedInvestment Number ofContracts RecordedInvestment (dollars in thousands)Residential real estate1 $6 — $—Loans to individuals— — 2 5Total1 $6 2 $5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Allowance for Credit Losses                                                                   | The following tables provide detail related to the allowance for credit losses: For the Six Months Ended June 30, 2014 Commercial,financial,agriculturaland other Real estateconstruction Residentialreal estate Commercialreal estate Loans toindividuals Unallocated Total (dollars in thousands)Allowance for credit losses:             Beginning Balance$22,663 $6,600 $7,727 $11,778 $5,457 $— $54,225Charge-offs(7,859) (296) (1,735) (297) (1,562) — (11,749)Recoveries421 337 323 255 365 — 1,701Provision (credit)6,731 (742) (190) (75) 824 — 6,548Ending Balance$21,956 $5,899 $6,125 $11,661 $5,084 $— $50,725Ending balance: individually evaluated for impairment$4,995 $— $546 $531 $— $— $6,072Ending balance: collectively evaluated for impairment16,961 5,899 5,579 11,130 5,084 — 44,653Loans:             Ending balance1,062,001 100,709 1,238,791 1,306,752 625,961   4,334,214Ending balance: individually evaluated for impairment24,573 486 7,624 6,965 —   39,648Ending balance: collectively evaluated for impairment1,037,428 100,223 1,231,167 1,299,787 625,961   4,294,566  For the Six Months Ended June 30, 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(14,221) (755) (643) (9,238) (1,755) — (26,612)Recoveries264 59 812 108 337 — 1,580Provision (credit)10,680 14 362 2,817 1,428 (4) 15,297Ending Balance$16,575 $8,246 $6,439 $16,128 $4,142 $5,922 $57,452Ending balance: individually evaluated for impairment$6,627 $267 $1,943 $818 $— $— $9,655Ending balance: collectively evaluated for impairment9,948 7,979 4,496 15,310 4,142 5,922 47,797Loans:             Ending balance1,012,315 66,243 1,269,830 1,280,784 600,580   4,229,752Ending balance: individually evaluated for impairment24,592 3,904 10,468 27,862 —   66,826Ending balance: collectively evaluated for impairment987,723 62,339 1,259,362 1,252,922 600,580   4,162,926 For the Three Months Ended June 30, 2014 Commercial,financial,agriculturaland other Real estateconstruction Residentialreal estate Commercialreal estate Loans toindividuals Unallocated Total (dollars in thousands)Allowance for credit losses:             Beginning Balance$26,125 $6,214 $6,026 $11,119 $5,022 $— $54,506Charge-offs(6,258) (296) (640) (157) (752) — (8,103)Recoveries336 168 79 235 187 — 1,005Provision (credit)1,753 (187) 660 464 627 — 3,317Ending Balance$21,956 $5,899 $6,125 $11,661 $5,084 $— $50,725 For the Three Months Ended, June 30, 2013 Commercial,financial,agriculturaland other Real estateconstruction Residentialreal estate Commercialreal estate Loans toindividuals Unallocated Total (dollars in thousands)Allowance for credit losses:             Beginning Balance$20,275 $7,733 $5,749 $18,470 $4,139 $5,896 $62,262Charge-offs(13,683) (671) (321) (694) (767) — (16,136)Recoveries136 47 89 11 243 — 526Provision (credit)9,847 1,137 922 (1,659) 527 26 10,800Ending Balance$16,575 $8,246 $6,439 $16,128 $4,142 $5,922 $57,452 |

| X                                                                                                                                                                                                                                                                                                                           |
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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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Troubled debt restructurings identified during the period.
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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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