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Non-performing Assets Including Troubled Debt Restructurings (Schedule of TDRs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Loans in accrual status [Member] | Commercial [Member]
Schedule of TDRs
Number of loans	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / asrv_FinancingReceivableAccrualAndNonaccrualStatusAxis = asrv_LoansInAccrualStatusMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialLoanMember
Current Balance	$ 204us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / asrv_FinancingReceivableAccrualAndNonaccrualStatusAxis = asrv_LoansInAccrualStatusMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialLoanMember
Concession Granted	Extension of maturity date
Loans in non-accrual status [Member] | Commercial loans secured by real estate [Member]
Schedule of TDRs
Number of loans	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / asrv_FinancingReceivableAccrualAndNonaccrualStatusAxis = asrv_LoansInNonAccrualStatusMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Current Balance	$ 265us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / asrv_FinancingReceivableAccrualAndNonaccrualStatusAxis = asrv_LoansInNonAccrualStatusMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateMember
Concession Granted	Extension of maturity date

X

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- Definition

Description of how troubled debt restructurings that occurred during the period are factored into the determination of the allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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