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Disclosures about Fair Value Measurements (Fair Value of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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FINANCIAL ASSETS: Carrying Value |  |  |  |
Cash and cash equivalents | $ 30,718 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 32,872 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 29,869 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 30,066 us-gaap_CashAndCashEquivalentsAtCarryingValue
Investment securities - HTM | 19,477 us-gaap_HeldToMaturitySecurities | 19,840 us-gaap_HeldToMaturitySecurities |  |
Regulatory stock | 5,626 us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock | 6,173 us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock |  |
Loans held for sale | 3,575 us-gaap_LoansHeldForSaleMortgages | 5,051 us-gaap_LoansHeldForSaleMortgages |  |
Loans, net of allowance for loan loss and unearned income | 840,708 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 817,457 us-gaap_LoansAndLeasesReceivableNetReportedAmount |  |
Accrued interest income receivable | 3,300 us-gaap_AccruedInvestmentIncomeReceivable | 3,127 us-gaap_AccruedInvestmentIncomeReceivable |  |
Bank owned life insurance | 37,388 us-gaap_BankOwnedLifeInsurance | 37,417 us-gaap_BankOwnedLifeInsurance |  |
Cash and cash equivalents | 30,718 us-gaap_CashAndCashEquivalentsFairValueDisclosure | 32,872 us-gaap_CashAndCashEquivalentsFairValueDisclosure |  |
Investment securities - AFS | 122,533 us-gaap_AvailableForSaleSecurities | 127,110 us-gaap_AvailableForSaleSecurities |  |
Investment securities - HTM | 20,013 us-gaap_HeldToMaturitySecuritiesFairValue | 20,213 us-gaap_HeldToMaturitySecuritiesFairValue |  |
Regulatory stock | 5,626 asrv_RegulatoryAssetsFairValueDisclosure | 6,173 asrv_RegulatoryAssetsFairValueDisclosure |  |
Loans held for sale | 3,675 us-gaap_LoansHeldForSaleFairValueDisclosure | 5,127 us-gaap_LoansHeldForSaleFairValueDisclosure |  |
Loans, net of allowance for loan loss and unearned income | 845,904 us-gaap_LoansReceivableFairValueDisclosure | 819,935 us-gaap_LoansReceivableFairValueDisclosure |  |
Accrued interest income receivable | 3,300 us-gaap_AccountsReceivableFairValueDisclosure | 3,127 us-gaap_AccountsReceivableFairValueDisclosure |  |
Bank owned life insurance | 37,388 us-gaap_CashSurrenderValueFairValueDisclosure | 37,417 us-gaap_CashSurrenderValueFairValueDisclosure |  |
FINANCIAL LIABILITIES: Carrying Value |  |  |  |
Deposits with no stated maturities | 587,825 asrv_DepositsWithNoStatedMaturities | 568,625 asrv_DepositsWithNoStatedMaturities |  |
Deposits with stated maturities | 304,851 asrv_DepositsWithStatedMaturities | 301,256 asrv_DepositsWithStatedMaturities |  |
Short-term borrowings | 27,219 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate | 38,880 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate |  |
All other borrowings | 57,085 us-gaap_OtherBorrowings | 55,085 us-gaap_OtherBorrowings |  |
Accrued interest payable | 1,545 us-gaap_InterestPayableCurrentAndNoncurrent | 1,706 us-gaap_InterestPayableCurrentAndNoncurrent |  |
Deposits with no stated maturities | 587,825 asrv_DepositsWithNoStatedMaturitiesFairValueDisclosure | 568,625 asrv_DepositsWithNoStatedMaturitiesFairValueDisclosure |  |
Deposits with stated maturities | 307,634 asrv_DepositsWithStatedMaturitiesFairValueDisclosure | 304,744 asrv_DepositsWithStatedMaturitiesFairValueDisclosure |  |
Short-term borrowings | 27,219 us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure | 38,880 us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure |  |
All other borrowings | 61,695 asrv_DebtAndCapitalLeaseObligationsFairValueDisclosure | 59,256 asrv_DebtAndCapitalLeaseObligationsFairValueDisclosure |  |
Accrued interest payable | 1,545 us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure | 1,706 us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure |  |
Level 1 [Member] |  |  |  |
FINANCIAL ASSETS: Carrying Value |  |  |  |
Cash and cash equivalents | 30,718 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 32,872 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Investment securities - AFS |  |  |  |
Investment securities - HTM |  |  |  |
Regulatory stock | 5,626 asrv_RegulatoryAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 6,173 asrv_RegulatoryAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Loans held for sale | 3,675 us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 5,127 us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Loans, net of allowance for loan loss and unearned income |  |  |  |
Accrued interest income receivable | 3,300 us-gaap_AccountsReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,127 us-gaap_AccountsReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Bank owned life insurance | 37,388 us-gaap_CashSurrenderValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 37,417 us-gaap_CashSurrenderValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
FINANCIAL LIABILITIES: Carrying Value |  |  |  |
Deposits with no stated maturities | 587,825 asrv_DepositsWithNoStatedMaturitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 568,625 asrv_DepositsWithNoStatedMaturitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Deposits with stated maturities |  |  |  |
Short-term borrowings | 27,219 us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 38,880 us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
All other borrowings |  |  |  |
Accrued interest payable | 1,545 us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,706 us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Level 2 [Member] |  |  |  |
FINANCIAL ASSETS: Carrying Value |  |  |  |
Cash and cash equivalents |  |  |  |
Investment securities - AFS | 122,533 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 127,110 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Investment securities - HTM | 17,031 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 17,241 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Regulatory stock |  |  |  |
Loans held for sale |  |  |  |
Loans, net of allowance for loan loss and unearned income |  |  |  |
Accrued interest income receivable |  |  |  |
Bank owned life insurance |  |  |  |
FINANCIAL LIABILITIES: Carrying Value |  |  |  |
Deposits with no stated maturities |  |  |  |
Deposits with stated maturities |  |  |  |
Short-term borrowings |  |  |  |
All other borrowings |  |  |  |
Accrued interest payable |  |  |  |
Level 3 [Member] |  |  |  |
FINANCIAL ASSETS: Carrying Value |  |  |  |
Cash and cash equivalents |  |  |  |
Investment securities - AFS |  |  |  |
Investment securities - HTM | 2,982 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 2,972 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Regulatory stock |  |  |  |
Loans held for sale |  |  |  |
Loans, net of allowance for loan loss and unearned income | 845,904 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 819,935 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Accrued interest income receivable |  |  |  |
Bank owned life insurance |  |  |  |
FINANCIAL LIABILITIES: Carrying Value |  |  |  |
Deposits with no stated maturities |  |  |  |
Deposits with stated maturities | 307,634 asrv_DepositsWithStatedMaturitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 304,744 asrv_DepositsWithStatedMaturitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Short-term borrowings |  |  |  |
All other borrowings | 61,695 asrv_DebtAndCapitalLeaseObligationsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 59,256 asrv_DebtAndCapitalLeaseObligationsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Accrued interest payable |  |  |  |

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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13487-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + 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) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 9 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 + Details
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- Definition Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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