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Goodwill and Intangibles - Additional Information (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 856,000 $ 856,000    
Carrying amount of mortgage servicing asset 516,000 611,000 545,000 145,000
Core Deposits [Member]
       
Finite-Lived Intangible Assets [Line Items]        
Amortization on core deposit intangible $ 332,000 $ 377,000 $ 318,000