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Scheduled Maturities of Long-Term Borrowings (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instruments [Abstract]      
2017 $ 10,000,000    
2018 10,000,000    
Long-term borrowings $ 20,000,000 $ 20,000,000 $ 20,000,000