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ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Individual loan balance is classified as nonaccrual status or troubled debt restructure $ 100,000asrv_IndividualLoanBalanceIsClassifiedAsNonaccrualStatusOrTroubledDebtRestructure               $ 100,000asrv_IndividualLoanBalanceIsClassifiedAsNonaccrualStatusOrTroubledDebtRestructure    
Loans past due as to maturity, days                 90 days    
Provision (credit) for loan losses (375,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses          1,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses    (150,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses 250,000us-gaap_ProvisionForLoanLeaseAndOtherLosses (375,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses 1,100,000us-gaap_ProvisionForLoanLeaseAndOtherLosses 775,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
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
              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
              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
              100,000asrv_FinancingReceivableThresholdBalanceWhichRequiresQuarterlyReviews
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
   
Commercial [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Provision (credit) for loan losses                 (449,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
(218,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
(438,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Threshold for individually evaluating loans 250,000asrv_FinancingReceivableThresholdForIndividuallyEvaluatingOfImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
              250,000asrv_FinancingReceivableThresholdForIndividuallyEvaluatingOfImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
   
Commercial [Member] | Minimum [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
   
Commercial [Member] | Maximum [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
   
Commercial loans secured by real estate [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Provision (credit) for loan losses                 506,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
1,615,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
1,053,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Real estate-mortgage [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Provision (credit) for loan losses                 (301,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
(8,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
(365,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
Consumer [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Provision (credit) for loan losses                 $ (151,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
$ (70,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
$ (129,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember