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Loans and Leases (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Disclosure Loans and Leases Additional Information [Abstract]    
Unearned income and deferred fees $ 0.5us-gaap_LoansAndLeasesReceivableDeferredIncome $ 0.7us-gaap_LoansAndLeasesReceivableDeferredIncome