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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net $ 1,179,942 $ 1,176,617
Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 323,312 350,680
Real Estate Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 456,153 413,058
Real Estate Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 315,082 322,062
Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net $ 85,395 $ 90,817