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Securities Sold Under Agreement to Repurchase - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fees And Commissions Income [Abstract]    
Securities to be used as collateral for the underlying repurchase agreements $ 65.8 $ 65.3
Federal funds purchased 22.0  
Securities sold under agreements to repurchase $ 56.8