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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | $ 28,803 | $ 42,667 |
Total past due and nonaccrual | 43,339 | 61,449 |
Current | 4,532,396 | 4,395,859 |
Total | 4,575,735 | 4,457,308 | $ 4,411,481
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 17,334 | 27,007 |
Total past due and nonaccrual | 21,359 | 30,300 |
Current | 1,105,522 | 1,021,809 |
Total | 1,126,881 | 1,052,109 |
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 31 | 236 |
Total past due and nonaccrual | 31 | 237 |
Current | 179,679 | 120,548 |
Total | 179,710 | 120,785 |
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 6,563 | 7,900 |
Total past due and nonaccrual | 11,930 | 15,434 |
Current | 1,192,290 | 1,210,910 |
Total | 1,204,220 | 1,226,344 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 4,640 | 7,306 |
Total past due and nonaccrual | 5,448 | 9,225 |
Current | 1,430,506 | 1,396,031 |
Total | 1,435,954 | 1,405,256 |
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 235 | 218 |
Total past due and nonaccrual | 4,571 | 6,253 |
Current | 624,399 | 646,561 |
Total | 628,970 | 652,814 |
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 10,038 | 13,473 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 3,817 | 2,816 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 3,562 | 5,162 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 35 | 1,797 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,624 | 3,698 |
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,444 | 2,690 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 59 | 213 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 1 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,187 | 1,295 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 442 | 122 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 756 | 1,059 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,054 | 2,619 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 149 | 264 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 618 | 1,077 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 331 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | $ 956 | $ 1,278 |

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