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Allowance for Loan Losses (Impaired Loans by Class) (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | $ 1,017,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment | $ 989,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Related Allowance | 502,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 520,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Unpaid Principal Balance | 1,104,000 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | 1,069,000 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 204,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember |
Unpaid Principal Balance | 204,000 us-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 | 813,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | 989,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Unpaid Principal Balance | 900,000 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | 1,069,000 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Impaired Loans with Specific Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 1,017,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember | 989,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Related Allowance | 502,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember | 520,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Impaired Loans with Specific Allowance [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 204,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember |
Related Allowance | 31,000 us-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 | 813,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember | 989,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember
Related Allowance | 471,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / asrv_ImpairedLoansAxis = asrv_ImpairedLoansWithSpecificAllowanceMember | 520,000 us-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 + Details
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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 + Details
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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 + Details
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