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Non-performing Assets Including Troubled Debt Restructurings (Non-performing Assets Including TDR) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Non-performing assets including TDR
Non-accrual loans	$ 2,146us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	$ 2,195us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
Other real estate owned	563us-gaap_OtherRealEstate	512us-gaap_OtherRealEstate
TDR's not in non-accrual	337asrv_TroubledDebtRestructuringModificationsRecordedInvestment	210asrv_TroubledDebtRestructuringModificationsRecordedInvestment
Total non-performing assets including TDR	3,046asrv_NonperformingAssetsIncludingTroubleDebtRestructurings	2,917asrv_NonperformingAssetsIncludingTroubleDebtRestructurings
Total non-performing assets as a percent of loans, net of unearned income, and other real estate owned	0.36%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans	0.35%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
Commercial loans secured by real estate [Member]
Non-performing assets including TDR
Non-accrual loans	272us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember	778us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Other real estate owned	384us-gaap_OtherRealEstate / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember	384us-gaap_OtherRealEstate / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Real estate-mortgage [Member]
Non-performing assets including TDR
Non-accrual loans	1,874us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember	1,417us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember
Other real estate owned	$ 179us-gaap_OtherRealEstate / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember	$ 128us-gaap_OtherRealEstate / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_MortgageLoansOnRealEstateMember

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- Definition

Total non-performing assets including trouble debt restructurings.

+ References

No definition available.

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

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- Definition

Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans.

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Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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