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Acquisition Activity - Summary of the Accretable Yield on the Loans Acquired from GSFC with Deteriorated Credit Quality (Detail) (GS Financial Corp [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
GS Financial Corp [Member]
      
Business Acquisition [Line Items]      
Balance, beginning of period $ (839) $ (644)   
Acquisition accretable yield       (1,169)
Accretion 133 966 525
Net transfers from nonaccretable difference to accretable yield (575) (1,161)   
Balance, end of period $ (1,281) $ (839) $ (644)