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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30 - 59 days past due | $ 12,797 | $ 8,690 |
60 - 89 days past due | 2,981 | 1,856 |
90 days and greater and still accruing | 2,374 | 2,505 |
Nonaccrual | 34,093 | 45,888 |
Total past due and nonaccrual | 52,245 | 58,939 |
Current | 4,359,236 | 4,224,894 |
Total | 4,411,481 | 4,283,833 | 4,240,004
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30 - 59 days past due | 467 | 594 |
60 - 89 days past due | 165 | 319 |
90 days and greater and still accruing | 267 | 185 |
Nonaccrual | 18,847 | 23,631 |
Total past due and nonaccrual | 19,746 | 24,729 |
Current | 1,051,785 | 996,327 |
Total | 1,071,531 | 1,021,056 |
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30 - 59 days past due | 0 | 0 |
60 - 89 days past due | 0 | 0 |
90 days and greater and still accruing | 0 | 0 |
Nonaccrual | 291 | 2,567 |
Total past due and nonaccrual | 291 | 2,567 |
Current | 115,497 | 90,722 |
Total | 115,788 | 93,289 |
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30 - 59 days past due | 6,371 | 4,002 |
60 - 89 days past due | 1,636 | 524 |
90 days and greater and still accruing | 778 | 1,041 |
Nonaccrual | 8,286 | 10,520 |
Total past due and nonaccrual | 17,071 | 16,087 |
Current | 1,217,771 | 1,246,631 |
Total | 1,234,842 | 1,262,718 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30 - 59 days past due | 2,162 | 1,199 |
60 - 89 days past due | 75 | 23 |
90 days and greater and still accruing | 0 | 13 |
Nonaccrual | 6,408 | 8,966 |
Total past due and nonaccrual | 8,645 | 10,201 |
Current | 1,336,657 | 1,286,271 |
Total | 1,345,302 | 1,296,472 |
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30 - 59 days past due | 3,797 | 2,895 |
60 - 89 days past due | 1,105 | 990 |
90 days and greater and still accruing | 1,329 | 1,266 |
Nonaccrual | 261 | 204 |
Total past due and nonaccrual | 6,492 | 5,355 |
Current | 637,526 | 604,943 |
Total | $ 644,018 | $ 610,298 |

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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