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Business Combination & Asset Purchase - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Custar [Member]
Dec. 13, 2013
Custar [Member]
Jul. 09, 2010
Hicksville [Member]
Dec. 31, 2013
Knisely [Member]
Loans At Acquisition Date [Line Items]              
Deposits at close included in purchase $ 29,500,000            
Loans included in purchase 11,400,000            
Aggregate acquisition cost (15,215,000)     1,200,000      
Recognition of core deposit intangible asset with acquired purchase 2,260,000       1,170,000 1,090,000 1,100,000
Number of years amortized over an estimated remaining economic useful life of deposits 7 years            
Number of years amortized on straight line basis 7 years            
Amortization expense $ 319,000 $ 312,000 $ 312,000