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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
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net $ 1,179,847 $ 1,176,617
Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 337,033 350,680
Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 439,942 413,058
Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 317,929 322,062
Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 84,943 90,817
Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 1,133,267 1,124,344
Pass [Member] | Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 322,316 332,257
Pass [Member] | Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 414,853 386,825
Pass [Member] | Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 311,248 314,544
Pass [Member] | Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 84,850 90,718
Special Mention [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 16,296 18,596
Special Mention [Member] | Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 4,469 7,025
Special Mention [Member] | Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 10,389 10,701
Special Mention [Member] | Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 1,423 861
Special Mention [Member] | Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 15 9
Substandard [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 30,284 33,677
Substandard [Member] | Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 10,248 11,398
Substandard [Member] | Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 14,700 15,532
Substandard [Member] | Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 5,258 6,657
Substandard [Member] | Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 78 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