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Loans and Leases (Additional Information) (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Loans and Leases [Abstract]    
Unearned income and deferred fees $ 600,000us-gaap_LoansAndLeasesReceivableDeferredIncome $ 500,000us-gaap_LoansAndLeasesReceivableDeferredIncome