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INVESTMENT SECURITIES (Schedule of Cost Basis and Fair Values of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities available for sale, Cost Basis $ 124,316us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 140,398us-gaap_AvailableForSaleSecuritiesAmortizedCost
Investment securities available for sale, Gross Unrealized Gains 3,279asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI 3,185asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
Investment securities available for sale, Gross Unrealized Losses (485)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI (1,605)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
Available for Sale, Fair Value, Total 127,110us-gaap_AvailableForSaleSecurities 141,978us-gaap_AvailableForSaleSecurities
Investment securities held to maturity, Cost Basis 19,840us-gaap_HeldToMaturitySecurities 18,187us-gaap_HeldToMaturitySecurities
Investment securities held to maturity, Gross Unrealized Gains 475asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains 289asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
Investment securities held to maturity, Gross Unrealized Losses (102)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses (688)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
Held to Maturity, Fair Value, Total 20,213us-gaap_HeldToMaturitySecuritiesFairValue 17,788us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Agency [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities available for sale, Cost Basis 5,931us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
6,926us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Investment securities available for sale, Gross Unrealized Gains 21asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
35asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Investment securities available for sale, Gross Unrealized Losses (46)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
(126)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available for Sale, Fair Value, Total 5,906us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
6,835us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
U.S. Agency mortgage-backed securities [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities available for sale, Cost Basis 102,888us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
121,480us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities available for sale, Gross Unrealized Gains 3,197asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
3,129asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities available for sale, Gross Unrealized Losses (317)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
(1,227)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Fair Value, Total 105,768us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
123,382us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Cost Basis 12,481us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
12,671us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Gross Unrealized Gains 395asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
289asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Gross Unrealized Losses (50)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
(477)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to Maturity, Fair Value, Total 12,826us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
12,483us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Corporate bonds [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities available for sale, Cost Basis 15,497us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
11,992us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
Investment securities available for sale, Gross Unrealized Gains 61asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
21asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
Investment securities available for sale, Gross Unrealized Losses (122)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
(252)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
Available for Sale, Fair Value, Total 15,436us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
11,761us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
Corporate bonds and other securities [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities held to maturity, Cost Basis 3,995us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
3,995us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
Investment securities held to maturity, Gross Unrealized Gains 6asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
  
Investment securities held to maturity, Gross Unrealized Losses (28)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
(91)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
Held to Maturity, Fair Value, Total 3,973us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
3,904us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
Taxable Municipal [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities held to maturity, Cost Basis 3,364us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
1,521us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
Investment securities held to maturity, Gross Unrealized Gains 74asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
  
Investment securities held to maturity, Gross Unrealized Losses (24)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
(120)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
Held to Maturity, Fair Value, Total $ 3,414us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
$ 1,401us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember