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Loans - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2014 Item | Mar. 31, 2013 | Feb. 28, 2014 | Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
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 | $ 793,000 | $ 1,888,000 |  |
Previously restructured loans past due | 5,200,000 |  |  |
Number of days past due for payment of interest on loans, minimum | 120 days |  |  |
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 | 24,900,000 |  |  |
Weighted-average loan-to-value ratio | 75.50% |  |  |
Texas Leading Index economic condition indicator |  |  | 130.3 | 129.2
Maximum origination value of loans which were subject to further refinement of valuation methodology | 1,000,000 |  |  |
Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of owner-occupied commercial real estate loans | 58.00% |  |  |
Non-Accrual Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled Debt Restructurings | 793,000 |  |  |
Additional interest that would have been recognized on non-accrual loans, net of tax | 358,000 | 608,000 |  |
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% |  |  |
Commercial and industrial, Other commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled Debt Restructurings | 793,000 | 275,000 |  |
Charge-off of previously restructures loans | 427,000 |  |  |
Number of days past due for payment of interest on loans, minimum | 180 days |  |  |
Commercial real estate, Buildings, land and other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled Debt Restructurings | 0 | 1,613,000 |  |
Charge-off of previously restructures loans | 0 |  |  |
Previously Restructured Loans Moved to OREO | $ 500,000 |  |  |

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- Definition Loan Amount Threshold + References No definition available. + Details
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- Definition Loan Value With Weighted-Average Loan-To-Value + References No definition available. + Details
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- Definition Maximum Loan To Value Percentage On Home Equity Loans + References No definition available. + Details
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- Definition Maximum origination value of loans which were subject to further refinement of valuation methodology. + References No definition available. + Details
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- Definition Minimum Number Of Days To Be Considered Past Due + References No definition available. + Details
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- Definition Number Of Loans With Calculated Risk Of Ten Or Higher + References No definition available. + Details
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- Definition Percentage Of Owner Occupied Commercial Real Estate Loans + References No definition available. + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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