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Loans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) Item | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Item | Sep. 30, 2014 USD ($) | Aug. 31, 2015 | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Number Of Loans Restructured During The Last Year In Excess of 90 Days Past Due | Item | 1 |  | 1 |  |  |  |  |  |
Maximum loan-to-value percentage on home equity loans |  |  | 80.00% |  |  |  |  |  |
Concentration of loans in a single industry in excess of ten percent | 0.00% |  | 0.00% |  |  |  |  |  |
Maximum percentage loan related to single industry |  |  | 10.00% |  |  |  |  |  |
Minimum number of days to be considered past due |  |  | 90 days |  |  |  |  |  |
Troubled debt restructurings |  |  | $ 554 | $ 6,524 |  |  |  |  |
Previously restructured loans past due |  |  | 268 |  |  |  |  |  |
Financing receivable, modifications, pre-modification recorded investment |  |  | $ 709 | 6,874 |  |  |  |  |
Number of days past due for payment of interest on loans, minimum |  |  | 120 days |  |  |  |  |  |
Texas Leading Index economic condition indicator |  |  |  |  | 123.7 |  | 129.3 |  |
Maximum origination value of loans which were subject to further refinement of valuation methodology |  |  | $ 1,000 |  |  |  |  |  |
Loans and Leases Receivable, Allowance | $ 110,373 | $ 98,312 | $ 110,373 | 98,312 |  | $ 106,607 | $ 99,542 | $ 98,286 | $ 92,438
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of owner-occupied commercial real estate loans | 52.00% |  | 52.00% |  |  |  |  |  |
Previously Restructured Loans Moved to OREO |  |  |  | 500 |  |  |  |  |
Charge-off of previously restructures loans |  |  |  | 0 |  |  |  |  |
Loans and Leases Receivable, Allowance | $ 25,883 | 26,780 | $ 25,883 | 26,780 |  | 24,935 | 27,163 | 22,046 | 22,590
Commercial and industrial, Energy [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of loans related to a single industry |  |  | 15.70% |  |  |  |  |  |
Troubled debt restructurings |  |  | $ 0 | 0 |  |  |  |  |
Financing receivable, modifications, pre-modification recorded investment |  |  | 0 | 0 |  |  |  |  |
Non-Accrual Loans [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Additional interest that would have been recognized on non-accrual loans, net of tax | 352 | 414 | 1,112 | 1,127 |  |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Financing receivables, impaired, troubled debt restructuring, write-down |  |  | 88 |  |  |  |  |  |
Financing receivable, modifications, pre-modification recorded investment |  |  | $ 286 |  |  |  |  |  |
Charge-off of previously restructures loans |  |  |  | 627 |  |  |  |  |
Number of days past due for payment of interest on loans, minimum |  |  | 180 days |  |  |  |  |  |
Loans and Leases Receivable, Allowance | 70,803 | $ 58,636 | $ 70,803 | $ 58,636 |  | $ 68,725 | 59,192 | $ 55,672 | $ 52,790
Grade 12 [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Number of days past due for payment of interest on loans, minimum |  |  | 120 days |  |  |  |  |  |
General percentage of valuation allowance in excess of principal balance, maximum |  |  | 30.00% |  |  |  |  |  |
Grade 13 [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
General percentage of valuation allowance in excess of principal balance, minimum |  |  | 30.00% |  |  |  |  |  |
Credit and Collateral Exceptions [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | $ 0 |  | $ 0 |  |  |  | 2,164 |  |
Credit and Collateral Exceptions [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  |  |  |  |  |  | 681 |  |
Credit and Collateral Exceptions [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  |  |  |  |  |  | $ 1,483 |  |

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