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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
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net $ 1,176,617 $ 623,530 $ 631,522
Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 350,680 91,724 88,188
Real Estate Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 413,058 217,496 208,875
Real Estate Residential [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 322,062 261,912 281,643
Consumer [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 90,817 52,398 52,816
Pass [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 1,124,344 606,663  
Pass [Member] | Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 332,257 90,128  
Pass [Member] | Real Estate Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 386,825 204,513  
Pass [Member] | Real Estate Residential [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 314,544 259,869  
Pass [Member] | Consumer [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 90,718 52,153  
Special Mention [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 18,596 7,316  
Special Mention [Member] | Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 7,025 876  
Special Mention [Member] | Real Estate Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 10,701 6,440  
Special Mention [Member] | Real Estate Residential [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 861    
Special Mention [Member] | Consumer [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 9    
Substandard [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 33,677 9,551  
Substandard [Member] | Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 11,398 720  
Substandard [Member] | Real Estate Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 15,532 6,543  
Substandard [Member] | Real Estate Residential [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 6,657 2,043  
Substandard [Member] | Consumer [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 90 245  
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