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Allowance for Loan Losses (Impaired Loans by Class) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	$ 1,017,000us-gaap_ImpairedFinancingReceivableRecordedInvestment	$ 989,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
Related Allowance	502,000us-gaap_ImpairedFinancingReceivableRelatedAllowance	520,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
Unpaid Principal Balance	1,104,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance	1,069,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	204,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember
Unpaid Principal Balance	204,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember
Commercial loans secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	813,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember	989,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Unpaid Principal Balance	900,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember	1,069,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Impaired Loans with Specific Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	1,017,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember	989,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Related Allowance	502,000us-gaap_ImpairedFinancingReceivableRelatedAllowance / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember	520,000us-gaap_ImpairedFinancingReceivableRelatedAllowance / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Impaired Loans with Specific Allowance [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	204,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Related Allowance	31,000us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Impaired Loans with Specific Allowance [Member] | Commercial loans secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	813,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember	989,000us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Related Allowance	471,000us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember	520,000us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Impaired Loans with No Specific Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment
Impaired Loans with No Specific Allowance [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment
Impaired Loans with No Specific Allowance [Member] | Commercial loans secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related 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 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related 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 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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