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Intangible assets, net - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Amortization expense of intangible assets $ 326 $ 267 $ 304
Core Deposit [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of intangible assets 8,150 2,027  
Accumulated amortization on intangible assets 1,512 1,189  
Trade Name [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of intangible assets 200    
Accumulated amortization on intangible assets $ 3