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Allowance for Loan Losses (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individual loan balance is classified as nonaccrual status or troubled debt restructure $ 100,000asrv_IndividualLoanBalanceIsClassifiedAsNonaccrualStatusOrTroubledDebtRestructure  
Loans past due as to maturity, days 90 days  
Provision for loan losses (250,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses   
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Threshold for individually evaluating loans 250,000asrv_FinancingReceivableThresholdForIndividuallyEvaluatingOfImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
 
Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Minimum individual loan balance requiring quarterly review 1,000,000asrv_FinancingReceivableThresholdBalanceWhichRequiresQuarterlyReviews
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
 
Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Minimum individual loan balance requiring quarterly review 250,000asrv_FinancingReceivableThresholdBalanceWhichRequiresQuarterlyReviews
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
 
Doubtful [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Minimum individual loan balance requiring quarterly review $ 100,000asrv_FinancingReceivableThresholdBalanceWhichRequiresQuarterlyReviews
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
 
Minimum [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Minimum percent of portfolio to be reviewed 50.00%asrv_FinancingReceivableMinimumPercentRequiredToBeReviewed
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Minimum percent of portfolio to be reviewed 55.00%asrv_FinancingReceivableMinimumPercentRequiredToBeReviewed
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember