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Deposits - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Deposits [Abstract]    
Cash, FDIC Insured Amount $ 0.1  
Aggregate amount of time deposits in denominations of $100,000 72,200.0 $ 46,500.0
Time deposits mature in 2016 73,100.0  
Time deposits mature in 2017 2.0  
Time deposits mature in 2018 2.0  
Time deposits mature in 2019 0.0  
Time deposits mature in 2020 0.0  
Time deposits mature in 2021 and thereafter $ 1.0