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Deposits (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Disclosure Text Block [Abstract]    
Time Deposit Maturities, Next Twelve Months $ 92.9  
Time Deposit Maturities, Year Two 30.2  
Time Deposit Maturities, Year Three 11.0  
Time Deposit Maturities, Year Four 9.0  
Time Deposit Maturities, Year Five 48.2  
Time Deposits $250,000 or More $ 29.0 $ 54.6