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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 Contract | Dec. 31, 2011 Contract | Dec. 31, 2010 Contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 60 | 51 | 15
Extend Maturity | $ 6,776 | $ 19,856 | $ 359
Modify Rate | 4,724 | 25,302 | 12,873
Modify Payments | 10,332 | 5,130 | 36,889
Others | 54 |  |
Total Pre-Modification Outstanding Recorded Investment | 21,886 | 50,288 | 50,121
Post-Modification Outstanding Recorded Investment | 22,221 | 31,993 | 32,168
Specific Reserve | 4,915 | 1,315 | 4,975
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 12 | 13 | 7
Extend Maturity | 1,599 | 100 | 250
Modify Rate | 187 | 475 | 105
Modify Payments | 9,476 | 2,218 | 36,591
Others | 0 |  |
Total Pre-Modification Outstanding Recorded Investment | 11,262 | 2,793 | 36,946
Post-Modification Outstanding Recorded Investment | 11,335 | 2,749 | 21,180
Specific Reserve | 4,237 | 743 | 4,972
Real estate construction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 2 | 6 | 2
Extend Maturity | 1,697 | 2,554 | 109
Modify Rate | 0 | 86 | 2,070
Modify Payments | 0 | 0 | 0
Others | 0 |  |
Total Pre-Modification Outstanding Recorded Investment | 1,697 | 2,640 | 2,179
Post-Modification Outstanding Recorded Investment | 2,133 | 2,852 | 1,051
Specific Reserve | 200 | 0 | 0
Residential real estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 25 | 10 | 2
Extend Maturity | 200 | 0 | 0
Modify Rate | 132 | 515 | 13
Modify Payments | 697 | 601 | 57
Others | 48 |  |
Total Pre-Modification Outstanding Recorded Investment | 1,077 | 1,116 | 70
Post-Modification Outstanding Recorded Investment | 973 | 1,100 | 67
Specific Reserve | 69 | 65 | 0
Commercial real estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 4 | 22 | 4
Extend Maturity | 3,280 | 17,202 | 0
Modify Rate | 4,308 | 24,226 | 10,685
Modify Payments | 71 | 2,311 | 241
Others | 0 |  |
Total Pre-Modification Outstanding Recorded Investment | 7,659 | 43,739 | 10,926
Post-Modification Outstanding Recorded Investment | 7,607 | 25,292 | 9,870
Specific Reserve | 409 | 507 | 3
Loans to individuals [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 17 |  |
Extend Maturity | 0 |  |
Modify Rate | 97 |  |
Modify Payments | 88 |  |
Others | 6 |  |
Total Pre-Modification Outstanding Recorded Investment | 191 |  |
Post-Modification Outstanding Recorded Investment | 173 |  |
Specific Reserve | $ 0 |  |

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