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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, 2012 Contract | Sep. 30, 2011 Contract | Sep. 30, 2012 Contract | Sep. 30, 2011 Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 7 | 6 | 15 | 37
Extend Maturity | $ 1,153 | $ 39 | $ 2,422 | $ 17,656
Modify Rate | 685 | 73 | 800 | 404
Modify Payments | 1,509 | 635 | 7,621 | 4,375
Total Pre-Modification Outstanding Recorded Investment | 3,347 | 747 | 10,843 | 22,435
Post-Modification Outstanding Recorded Investment | 3,533 | 738 | 10,336 | 22,419
Specific Reserve | 844 | 7 | 3,238 | 2,164
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 6 | 1 | 10 | 10
Extend Maturity | 1,153 | 0 | 1,599 | 100
Modify Rate | 169 | 0 | 187 | 105
Modify Payments | 1,509 | 50 | 7,538 | 2,218
Total Pre-Modification Outstanding Recorded Investment | 2,831 | 50 | 9,324 | 2,423
Post-Modification Outstanding Recorded Investment | 3,004 | 46 | 8,885 | 2,402
Specific Reserve | 746 | 0 | 3,140 | 606
Real estate construction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 0 | 0 | 1 | 4
Extend Maturity | 0 | 0 | 823 | 354
Modify Rate | 0 | 0 | 0 | 0
Modify Payments | 0 | 0 | 0 | 0
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 823 | 354
Post-Modification Outstanding Recorded Investment | 0 | 0 | 791 | 506
Specific Reserve | 0 | 0 | 0 | 0
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 0 | 2 | 3 | 5
Extend Maturity | 0 | 0 | 0 | 0
Modify Rate | 0 | 73 | 97 | 100
Modify Payments | 0 | 104 | 83 | 179
Total Pre-Modification Outstanding Recorded Investment | 0 | 177 | 180 | 279
Post-Modification Outstanding Recorded Investment | 0 | 175 | 131 | 274
Specific Reserve | 0 | 7 | 0 | 7
Commercial real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 1 | 3 | 1 | 18
Extend Maturity | 0 | 39 | 0 | 17,202
Modify Rate | 516 | 0 | 516 | 199
Modify Payments | 0 | 481 | 0 | 1,978
Total Pre-Modification Outstanding Recorded Investment | 516 | 520 | 516 | 19,379
Post-Modification Outstanding Recorded Investment | 529 | 517 | 529 | 19,237
Specific Reserve | $ 98 | $ 0 | $ 98 | $ 1,551

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