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Loans - Additional Information (Detail) (USD $) | 9 Months Ended |  |  | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 Loan | Aug. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Commercial Real Estate Loans [Member] | Sep. 30, 2013 Non-Accrual Loans [Member] | Sep. 30, 2012 Non-Accrual Loans [Member] | Sep. 30, 2013 Non-Accrual Loans [Member] | Sep. 30, 2012 Non-Accrual Loans [Member] | Sep. 30, 2013 Grade 12 [Member] | Sep. 30, 2013 Grade 13 [Member] | Sep. 30, 2013 Commercial and industrial, Other commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of owner-occupied commercial real estate loans |  |  |  | 58.00% |  |  |  |  |  |  |
Maximum loan-to-value percentage on home equity loans | 80.00% |  |  |  |  |  |  |  |  |  |
Maximum percentage loan related to single industry | 10.00% |  |  |  |  |  |  |  |  |  |
Minimum number of days to be considered past due | 90 days |  |  |  |  |  |  |  |  |  |
Troubled Debt Restructurings |  |  |  |  |  |  | $ 4,400,000 |  |  |  |
Additional interest that would have been recognized on non-accrual loans, net of tax |  |  |  |  | 568,000 | 646,000 | 1,800,000 | 1,900,000 |  |  |
Previously restructured loans past due | 2,100,000 |  |  |  |  |  |  |  |  |  |
Charge-off of previously restructures loans | 1,100,000 |  |  |  |  |  |  |  |  |  |
Number of days past due for payment of interest on loans, minimum | 120 days |  |  |  |  |  |  |  |  |  | 180 days
General percentage of valuation allowance in excess of principal balance, maximum |  |  |  |  |  |  |  |  | 30.00% |  |
General percentage of valuation allowance in excess of principal balance, minimum |  |  |  |  |  |  |  |  |  | 30.00% |
Number of loans with calculated risk of 10 or higher greater than $5 million | 3 |  |  |  |  |  |  |  |  |  |
Loan amount threshold | 5,000,000 |  |  |  |  |  |  |  |  |  |
Loan value with weighted-average loan-to-value | 30,800,000 |  |  |  |  |  |  |  |  |  |
Weighted-average loan-to-value ratio | 75.40% |  |  |  |  |  |  |  |  |  |
Texas Leading Index economic condition indicator |  | 126.3 | 123.5 |  |  |  |  |  |  |  |
Maximum origination value of loans which were subject to further refinement of valuation methodology | $ 1,000,000 |  |  |  |  |  |  |  |  |  |

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