| **Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) - USD ($) $ in Thousands** | 3 Months Ended | 9 Months Ended |          |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|----------|
||
| **Financing Receivable, Impaired [Line Items]**                                                                                                                             |           |           |     |   |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                               | $ 27,571       |           | $ 27,571 |   | $ 29,504 |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                          | 35,356         |           | 35,356   |   | 34,398 |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                  | 13,256         |           | 13,256   |   | 25,747 |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                             | 13,890         |           | 13,890   |   | 26,517 |
| Related allowance                                                                                                                                                           | 4,255          |           | 4,255    |   | 9,461 |
| Recorded investment                                                                                                                                                         | 40,827         |           | 40,827   |   | 55,251 |
| Unpaid principal balance                                                                                                                                                    | 49,246         |           | 49,246   |   | 60,915 |
| Average recorded investment                                                                                                                                                 | 8,132          | $ 15,634       | 6,483    | $ 13,212 |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                       | 33,203         | 31,077         | 39,145   | 37,078 |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                   | 110            | 103            | 362      | 344 |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                      | 30             | 53             | 104      | 140 |   |
| Impaired Financing Receivable, Average Recorded Investment                                                                                                                  | 41,335         | 46,711         | 45,628   | 50,290 |   |
| Interest Income Recognized                                                                                                                                                  | 140            | 156            | 466      | 484 |   |
| Commercial, financial, agricultural and other [Member]                                                                                                                      |           |           |     |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                             |           |           |     |   |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                               | 10,581         |           | 10,581   |   | 9,439 |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                          | 15,618         |           | 15,618   |   | 10,937 |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                  | 12,812         |           | 12,812   |   | 24,826 |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                             | 13,254         |           | 13,254   |   | 25,583 |
| Related allowance                                                                                                                                                           | 4,202          |           | 4,202    |   | 9,304 |
| Average recorded investment                                                                                                                                                 | 7,700          | 14,140         | 6,125    | 11,944 |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                       | 14,215         | 10,973         | 19,199   | 15,209 |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                   | 40             | 39             | 161      | 77 |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                      | 29             | 48             | 100      | 125 |   |
| Real estate construction [Member]                                                                                                                                           |           |           |     |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                             |           |           |     |   |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                               | 31             |           | 31       |   | 236 |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                          | 119            |           | 119      |   | 476 |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                  | 0              |           | 0        |   | 0 |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                             | 0              |           | 0        |   | 0 |
| Related allowance                                                                                                                                                           | 0              |           | 0        |   | 0 |
| Average recorded investment                                                                                                                                                 | 0              | 0              | 0        | 0 |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                       | 32             | 295            | 102      | 1,506 |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                   | 0              | 1              | 0        | 19 |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                      | 0              | 0              | 0        | 0 |   |
| Residential real estate [Member]                                                                                                                                            |           |           |     |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                             |           |           |     |   |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                               | 9,778          |           | 9,778    |   | 10,773 |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                          | 11,399         |           | 11,399   |   | 12,470 |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                  | 364            |           | 364      |   | 367 |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                             | 556            |           | 556      |   | 380 |
| Related allowance                                                                                                                                                           | 20             |           | 20       |   | 56 |
| Average recorded investment                                                                                                                                                 | 351            | 1,406          | 275      | 1,178 |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                       | 10,748         | 10,590         | 10,987   | 11,047 |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                   | 39             | 38             | 118      | 167 |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                      | 0              | 3              | 0        | 12 |   |
| Commercial Real Estate [Member]                                                                                                                                             |           |           |     |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                             |           |           |     |   |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                               | 6,885          |           | 6,885    |   | 8,768 |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                          | 7,862          |           | 7,862    |   | 10,178 |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                  | 80             |           | 80       |   | 554 |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                             | 80             |           | 80       |   | 554 |
| Related allowance                                                                                                                                                           | 33             |           | 33       |   | 101 |
| Average recorded investment                                                                                                                                                 | 81             | 88             | 83       | 90 |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                       | 7,894          | 8,873          | 8,545    | 9,007 |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                   | 26             | 24             | 69       | 78 |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                      | 1              | 2              | 4        | 3 |   |
| Loans to individuals [Member]                                                                                                                                               |           |           |     |   |   |
| **Financing Receivable, Impaired [Line Items]**                                                                                                                             |           |           |     |   |   |
| Impaired Financing Receivable, with No Related Allowance, Recorded Investment                                                                                               | 296            |           | 296      |   | 288 |
| Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance                                                                                          | 358            |           | 358      |   | 337 |
| Impaired Financing Receivable, with Related Allowance, Recorded Investment                                                                                                  | 0              |           | 0        |   | 0 |
| Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance                                                                                             | 0              |           | 0        |   | 0 |
| Related allowance                                                                                                                                                           | 0              |           | 0        |   | $ 0 |
| Average recorded investment                                                                                                                                                 | 0              | 0              | 0        | 0 |   |
| Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment                                                                                       | 314            | 346            | 312      | 309 |   |
| Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method                                                                                   | 5              | 1              | 14       | 3 |   |
| Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method                                                                                      | $ 0            | $ 0            | $ 0      | $ 0 |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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| - Definition
Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
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| - Definition
Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.
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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
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Amount of allowance for credit losses related to recorded investment.
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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.
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Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.
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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.
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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.
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