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Related Party Transactions - Additional Information (Detail) (Directors and Executive Officers [Member], USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Directors and Executive Officers [Member]
    
Related Party Transaction [Line Items]    
Granted loans to affiliate companies $ 5,900,000 $ 6,500,000
New loans approved 582,000  
Subsequent advances 11,300,000  
Payment received 11,800,000  
Difference in related borrowings amounts 506,000  
Ownership interest amount $ 22,300,000 $ 4,200,000