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Allowance for Loan Losses and Credit Quality Indicators - Additional information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]          
Impaired loans, recorded investment $ 29,663,000   $ 29,663,000   $ 23,202,000
Impaired loans, unpaid principal balance 40,611,000   40,611,000   29,356,000
Impaired loans, related allowance 4,843,000   4,843,000   5,593,000
Impaired loans, average recorded investment 35,529,000 25,903,000 30,716,000 28,786,000  
Minimum commercial loan relationships to be reviewed by loan review function 3,000,000   3,000,000    
Total loan restructurings 11,200,000   11,200,000   12,050,000
Net nonaccrual status 2,770,000   2,770,000   3,830,000
Nonperforming TDRs 276,000   276,000   6,010,000
Percentage of Total TDR 2.46%   2.46%   49.88%
Allowance for loan losses 2,000,000   2,000,000   1,870,000
Interest income recognized on loan restructurings 132,000 81,000 238,000 175,000  
Restructured loans to borrowers experiencing financial difficulty in excess of 250,000   250,000    
Performing status returned period     6 months    
Payment defaults on loans modified as TDRs 0 0 0 0  
Time period for restructuring 12 months 12 months 12 months 12 months  
One of the seven purchased credit impaired loan pools
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Impaired loans, recorded investment 3,570,000   3,570,000    
Impaired loans, unpaid principal balance 4,140,000   4,140,000    
Impaired loans, related allowance 177,000   177,000    
Impaired loans, average recorded investment 3,590,000   11,860,000    
Impaired loans, interest income recognized $ 34,000   $ 117,000