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Changes in Allowance for Loan Losses by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance $ 7,764 $ 6,934 $ 7,645
Provision (Credit) 698 1,206 8,923
Charge-offs (768) (640) (9,717)
Recoveries 100 264 83
Ending Balance 7,794 7,764 6,934
Commercial real estate
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 3,504 3,182 2,371
Provision (Credit) 19 357 8,339
Charge-offs (195) (175) (7,536)
Recoveries 78 140 8
Ending Balance 3,406 3,504 3,182
Residential real estate
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 1,531 877 487
Provision (Credit) 365 647 415
Charge-offs (155) (2) (36)
Recoveries 5 9 11
Ending Balance 1,746 1,531 877
Commercial and industrial
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 2,712 2,849 4,748
Provision (Credit) (161) 215 209
Charge-offs (391) (442) (2,129)
Recoveries 7 90 21
Ending Balance 2,167 2,712 2,849
Consumer
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 17 26 39
Provision (Credit) 13 (13) (40)
Charge-offs (27) (21) (16)
Recoveries 10 25 43
Ending Balance 13 17 26
Unallocated
     
Financing Receivable, Allowance for Credit Losses [Line Items]      
Provision (Credit) 462    
Ending Balance $ 462