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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 Contract | Sep. 30, 2012 Contract | Sep. 30, 2013 Contract | Sep. 30, 2012 Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 25 | 7 | 57 | 15
Extend Maturity | $ 3,277 | $ 1,153 | $ 4,083 | $ 2,422
Modify Rate | 60 | 685 | 664 | 800
Modify Payments | 1,934 | 1,509 | 3,236 | 7,621
Total Pre-Modification Outstanding Recorded Investment | 5,271 | 3,347 | 7,983 | 10,843
Post- Modification Outstanding Recorded Investment | 3,272 | 3,533 | 5,532 | 10,336
Financing Receivable Specific Reserve |  |  |  | 3,238
Specific Reserve | 1260000 | 844000 | 1534000 |
Recorded Investment | 14 | 0 | 18 | 0
Number of Contracts | 2 | 0 | 3 | 0
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 4 | 6 | 7 | 10
Extend Maturity | 2,442 | 1,153 | 2,969 | 1,599
Modify Rate | 0 | 169 | 0 | 187
Modify Payments | 93 | 1,509 | 105 | 7,538
Total Pre-Modification Outstanding Recorded Investment | 2,535 | 2,831 | 3,074 | 9,324
Post- Modification Outstanding Recorded Investment | 601 | 3,004 | 1,041 | 8,885
Financing Receivable Specific Reserve |  |  |  | 3,140
Specific Reserve | 198 | 746 | 198 |
Real estate construction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts |  |  |  | 1
Extend Maturity |  |  |  | 823
Modify Rate |  |  |  | 0
Modify Payments |  |  |  | 0
Total Pre-Modification Outstanding Recorded Investment |  |  |  | 823
Post- Modification Outstanding Recorded Investment |  |  |  | 791
Financing Receivable Specific Reserve |  |  |  | 0
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 10 |  | 32 | 3
Extend Maturity | 67 |  | 347 | 0
Modify Rate | 24 |  | 350 | 97
Modify Payments | 269 |  | 1,552 | 83
Total Pre-Modification Outstanding Recorded Investment | 360 |  | 2,249 | 180
Post- Modification Outstanding Recorded Investment | 361 |  | 1,924 | 131
Financing Receivable Specific Reserve |  |  |  | 0
Specific Reserve | 0 |  | 274 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 5 | 1 | 6 | 1
Extend Maturity | 758 | 0 | 758 | 0
Modify Rate | 0 | 516 | 244 | 516
Modify Payments | 1,551 | 0 | 1,551 | 0
Total Pre-Modification Outstanding Recorded Investment | 2,309 | 516 | 2,553 | 516
Post- Modification Outstanding Recorded Investment | 2,252 | 529 | 2,484 | 529
Specific Reserve | 1062 | 98 | 1062 | 98
Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 6 |  | 12 |
Extend Maturity | 10 |  | 9 |
Modify Rate | 36 |  | 70 |
Modify Payments | 21 |  | 28 |
Total Pre-Modification Outstanding Recorded Investment | 67 |  | 107 |
Post- Modification Outstanding Recorded Investment | 58 |  | 83 |
Specific Reserve | 0 |  | 0 |
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modification, Subsequent Default, Number of Contracts | 1 |  | 1 |
Recorded Investment | 9 | 0 | 9 | 0
Number of Contracts |  | 0 |  | 0
Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modification, Subsequent Default, Number of Contracts | 1 |  | 2 |
Recorded Investment | $ 5 | $ 0 | $ 9 | $ 0
Number of Contracts |  | 0 |  | 0

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