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Loans, net and allowance for loan losses - Information Concerning Nonaccrual Loans by Major Loan Classification (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total $ 12,166 $ 2,280
Commercial [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 4,038 304
Real Estate Commercial [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 4,503 145
Real Estate Residential [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total 3,535 1,800
Consumer [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans, Total $ 90 $ 31