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Deposits - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Minimum [Member]
Dec. 31, 2013
Minimum [Member]
Deposits [Line Items]      
Time deposits   $ 100,000 $ 100,000
Brokered deposits $ 5,000,000    
Time deposits year of maturity 2017    
Maturity description of time deposits At September 30, 2014, time deposits of $100,000 or more include brokered deposits of $5,000,000, which mature in 2017.