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Allowance for Loan Losses and Credit Quality Indicators - Additional information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]          
Impaired loans, recorded investment $ 27,144,000   $ 27,144,000   $ 23,202,000
Impaired loans, unpaid principal balance 35,991,000   35,991,000   29,356,000
Impaired loans, related allowance 5,256,000   5,256,000   5,593,000
Impaired loans, average recorded investment 31,283,000 25,731,000 30,905,000 29,980,000  
Minimum commercial loan relationships to be reviewed by loan review function 3,000,000   3,000,000    
Total loan restructurings 11,920,000   11,920,000   12,050,000
Net nonaccrual status 2,660,000   2,660,000   3,830,000
Nonperforming TDRs 2,230,000   2,230,000   6,010,000
Percentage of Total TDR 18.69%   18.69%   49.88%
Allowance for loan losses 1,690,000   1,690,000   1,870,000
Interest income recognized on loan restructurings 183,000 62,000 422,000 237,000  
Restructured loans to borrowers experiencing financial difficulty in excess of 250,000   250,000    
Performing status returned period     6 months    
Four of the seven purchased credit impaired loan pools
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Impaired loans, recorded investment 23,450,000   23,450,000    
Impaired loans, unpaid principal balance 36,300,000   36,300,000    
Impaired loans, related allowance 1,040,000   1,040,000    
Impaired loans, average recorded investment 23,540,000   15,800,000    
Impaired loans, interest income recognized 721,000   839,000    
Covered Loans
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Accruing loans contractually past due 90 days or more $ 82,000   $ 82,000