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Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment $ 547,403 $ 518,882
Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 263,749 257,091
Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 283,654 261,791
Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 474,761 460,129
Pass [Member] | Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 239,105 234,835
Pass [Member] | Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 235,746 225,294
Special Mention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 24,488 18,935
Special Mention [Member] | Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 9,052 6,641
Special Mention [Member] | Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 15,436 12,294
Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 47,195 38,960
Substandard [Member] | Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 15,419 15,459
Substandard [Member] | Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 31,776 23,501
Doubtful [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 959 858
Doubtful [Member] | Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 263 156
Doubtful [Member] | Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment $ 696 $ 702