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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