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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (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