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Loans (Narative) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loans [Abstract]    
Real estate-construction loans, percentage 3.20%asrv_RealEstateConstructionLoansPercentage 3.50%asrv_RealEstateConstructionLoansPercentage
Loan balances net of unearned income $ 582us-gaap_LoansAndLeasesReceivableDeferredIncome $ 554us-gaap_LoansAndLeasesReceivableDeferredIncome