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Short-Term Borrowings - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Short-term Debt [Line Items]        
Maturity period of federal funds     1 day 4 days
Federal funds purchased   $ 0    
Securities sold under repurchase agreements 755,000 1,231,000    
Available fund lines from correspondent banks $ 18,800,000 $ 18,800,000