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Loans - Additional Information (Detail) (USD $) | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 Item D | May 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Non-Accrual Loans [Member] | Jun. 30, 2012 Non-Accrual Loans [Member] | Jun. 30, 2013 Non-Accrual Loans [Member] | Jun. 30, 2012 Non-Accrual Loans [Member] | Jun. 30, 2013 Commercial and industrial, Other commercial [Member] D | Jun. 30, 2013 Grade 12 [Member] | Jun. 30, 2013 Grade 13 [Member] | Jun. 30, 2013 Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of owner-occupied commercial real estate loans |  |  |  |  |  |  |  |  |  |  | 56.00%
Maximum loan-to-value percentage on home equity loans | 80.00% |  |  |  |  |  |  |  |  |  |
Maximum percentage loan related to single industry | 10.00% |  |  |  |  |  |  |  |  |  |
Troubled Debt Restructurings |  |  |  |  |  | $ 3,200,000 |  |  |  |  |
Additional interest that would have been recognized on non-accrual loans, net of tax |  |  |  | 591,000 | 639,000 | 1,200,000 | 1,300,000 |  |  |  |
Charge-off of previously restructures loans | 1,100,000 |  |  |  |  |  |  |  |  |  |
Minimum number of days to be considered past due | 90 days |  |  |  |  |  |  |  |  |  |
Previously restructured loans past due | 169,000 |  |  |  |  |  |  |  |  |  |
Number of days past due for payment of interest on loans, minimum | 120 |  |  |  |  |  |  | 180 |  |  |
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 | 31,000,000 |  |  |  |  |  |  |  |  |  |
Weighted-average loan-to-value ratio | 75.60% |  |  |  |  |  |  |  |  |  |
Texas Leading Index economic condition indicator |  | 124.5 | 123.8 |  |  |  |  |  |  |  |
Maximum origination value of loans which were subject to further refinement of valuation methodology | $ 1,000,000 |  |  |  |  |  |  |  |  |  |

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