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Loans - Additional Information (Detail) (USD $) | 6 Months Ended |  |  | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 Item | Jun. 30, 2013 | May 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Commercial Real Estate Loans [Member] | Jun. 30, 2014 Commercial and industrial, Energy [Member] | Jun. 30, 2014 Non-Accrual Loans [Member] | Jun. 30, 2013 Non-Accrual Loans [Member] | Jun. 30, 2014 Non-Accrual Loans [Member] | Jun. 30, 2013 Non-Accrual Loans [Member] | Jun. 30, 2014 Grade 12 [Member] | Jun. 30, 2014 Grade 13 [Member] | Jun. 30, 2014 Commercial and industrial, Other commercial [Member] | Jun. 30, 2013 Commercial and industrial, Other commercial [Member] | Jun. 30, 2014 Commercial and industrial, Other commercial [Member] Commercial Portfolio Segment [Member] | Jun. 30, 2014 Commercial real estate, Buildings, land and other [Member] | Jun. 30, 2013 Commercial real estate, Buildings, land and other [Member] | Jun. 30, 2014 Commercial real estate, Buildings, land and other [Member] Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 6,874,000 | $ 6,303,000 |  |  |  |  |  |  |  |  |  |  | $ 3,752,000 | $ 2,138,000 | $ 2,900,000 | $ 3,122,000 | $ 4,165,000 | $ 3,100,000
Percentage of owner-occupied commercial real estate loans |  |  |  |  | 57.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan-to-value percentage on home equity loans | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage loan related to single industry | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loans related to a single industry |  |  |  |  |  | 14.30% |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of days to be considered past due | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Troubled Debt Restructurings | 6,741,000 | 5,069,000 |  |  |  |  |  |  | 6,700,000 |  |  |  | 3,672,000 | 1,343,000 |  | 3,069,000 | 3,726,000 |
Additional interest that would have been recognized on non-accrual loans, net of tax |  |  |  |  |  |  | 355,000 | 591,000 | 713,000 | 1,200,000 |  |  |  |  |  |  |  |
Previously restructured loans past due | 725,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge-off of previously restructures loans |  |  |  |  |  |  |  |  |  |  |  |  | 427,000 |  |  | 0 |  |
Previously Restructured Loans Moved to OREO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |
Number of days past due for payment of interest on loans, minimum | 120 days |  |  |  |  |  |  |  |  |  | 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 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan amount threshold | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan value with weighted-average loan-to-value | 14,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average loan-to-value ratio | 73.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Texas Leading Index economic condition indicator |  |  | 131.4 | 129.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum origination value of loans which were subject to further refinement of valuation methodology | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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