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Business Combination & Asset Purchase - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jul. 09, 2010
Business Acquisition [Line Items]        
Deposits at close included in purchase $ 29,500   $ 29,500  
Loans included in purchase     11,400  
Aggregate acquisition cost     (15,215)  
Recognition of core deposit intangible asset with acquired purchase $ 2,260      
Number of years amortized over an estimated remaining economic useful life of deposits 7 years      
Amortization expense $ 323 $ 480 319  
Custar [Member]        
Business Acquisition [Line Items]        
Aggregate acquisition cost     1,200  
Recognition of core deposit intangible asset with acquired purchase     $ 1,170  
Hicksville [Member]        
Business Acquisition [Line Items]        
Recognition of core deposit intangible asset with acquired purchase       $ 1,090
Knisely [Member]        
Business Acquisition [Line Items]        
Recognition of core deposit intangible asset with acquired purchase   $ 1,100