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Allowance for Loan Losses and Credit Quality Indicators - Additional information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total impaired loans, Recorded Investment $ 28,813,000   $ 23,202,000
Total impaired loans, Unpaid Principal Balance 37,093,000   29,356,000
Total impaired loans, Related Allowance 6,401,000   5,593,000
Total impaired loans, Average Recorded Investment 26,012,000 28,540,000  
Total impaired loans, Interest Income Recognized 644,000 194,000  
Minimum commercial loan relationships to be reviewed by loan review function 3,000,000    
Total loan restructurings 11,870,000   12,050,000
Net nonaccrual status 2,340,000   3,830,000
Nonperforming TDRs 1,600,000   6,010,000
Percentage of Total TDR 13.45%   49.88%
Allowance for loan losses 1,650,000   1,870,000
Interest income recognized on loan restructurings 246,000 94,000  
Restructured loans to borrowers experiencing financial difficulty in excess of 250,000    
Performing status returned period 6 months    
Payment defaults on loans modified as TDRs 0 0  
Time period for restructuring 12 months 12 months  
Three of the seven purchased credit impaired loan pools
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total impaired loans, Recorded Investment 20,080,000    
Total impaired loans, Unpaid Principal Balance 26,610,000    
Total impaired loans, Related Allowance 276,000    
Total impaired loans, Average Recorded Investment 20,230,000    
Total impaired loans, Interest Income Recognized $ 84,000