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Investment Securities (Summary of Cost Basis and Fair Values of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities available for sale, Cost Basis $ 119,393us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 124,316us-gaap_AvailableForSaleSecuritiesAmortizedCost
Investment securities available for sale, Gross Unrealized Gains 3,493asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI 3,279asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
Investment securities available for sale, Gross Unrealized Losses (353)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI (485)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
Available for Sale, Fair Value, Total 122,533us-gaap_AvailableForSaleSecurities 127,110us-gaap_AvailableForSaleSecurities
Investment securities held to maturity, Cost Basis 19,477us-gaap_HeldToMaturitySecurities 19,840us-gaap_HeldToMaturitySecurities
Investment securities held to maturity, Gross Unrealized Gains 569asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains 475asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
Investment securities held to maturity, Gross Unrealized Losses (33)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses (102)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
Held to Maturity, Fair Value, Total 20,013us-gaap_HeldToMaturitySecuritiesFairValue 20,213us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Agency [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities available for sale, Cost Basis 5,932us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
5,931us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Investment securities available for sale, Gross Unrealized Gains 29asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
21asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Investment securities available for sale, Gross Unrealized Losses (13)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
(46)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available for Sale, Fair Value, Total 5,948us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
5,906us-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 97,964us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
102,888us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities available for sale, Gross Unrealized Gains 3,385asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
3,197asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities available for sale, Gross Unrealized Losses (203)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
(317)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Fair Value, Total 101,146us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
105,768us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Cost Basis 12,120us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
12,481us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Gross Unrealized Gains 449asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
395asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Gross Unrealized Losses (15)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
(50)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to Maturity, Fair Value, Total 12,554us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
12,826us-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
15,497us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
Investment securities available for sale, Gross Unrealized Gains 79asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
61asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
Investment securities available for sale, Gross Unrealized Losses (137)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
(122)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
Available for Sale, Fair Value, Total 15,439us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
15,436us-gaap_AvailableForSaleSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_CorporateBondSecuritiesMember
Taxable Municipal [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Investment securities held to maturity, Cost Basis 3,362us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
3,364us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
Investment securities held to maturity, Gross Unrealized Gains 116asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
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
Held to Maturity, Fair Value, Total 3,478us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
3,414us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
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 4asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
6asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
Investment securities held to maturity, Gross Unrealized Losses (18)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
(28)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
Held to Maturity, Fair Value, Total $ 3,981us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember
$ 3,973us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_OtherDebtSecuritiesMember