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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net $ 1,177,122 $ 1,176,617
Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 358,729 350,680
Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 409,723 413,058
Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 320,803 322,062
Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 87,867 90,817
Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 1,134,186 1,124,344
Pass [Member] | Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 347,336 332,257
Pass [Member] | Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 384,591 386,825
Pass [Member] | Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 314,567 314,544
Pass [Member] | Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 87,692 90,718
Special Mention [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 16,443 18,596
Special Mention [Member] | Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 5,241 7,025
Special Mention [Member] | Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 10,163 10,701
Special Mention [Member] | Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 1,023 861
Special Mention [Member] | Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 16 9
Substandard [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 26,493 33,677
Substandard [Member] | Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 6,152 11,398
Substandard [Member] | Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 14,969 15,532
Substandard [Member] | Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 5,213 6,657
Substandard [Member] | Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 159 90
Doubtful [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net      
Doubtful [Member] | Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net      
Doubtful [Member] | Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net      
Doubtful [Member] | Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net      
Doubtful [Member] | Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net