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Investment Securities (Summary of Cost Basis and Fair Values of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |
Investment securities available for sale, Cost Basis | $ 119,393 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 124,316 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Investment securities available for sale, Gross Unrealized Gains | 3,493 asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI | 3,279 asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI
Investment securities available for sale, Gross Unrealized Losses | (353)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI | (485)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI
Available for Sale, Fair Value, Total | 122,533 us-gaap_AvailableForSaleSecurities | 127,110 us-gaap_AvailableForSaleSecurities
Investment securities held to maturity, Cost Basis | 19,477 us-gaap_HeldToMaturitySecurities | 19,840 us-gaap_HeldToMaturitySecurities
Investment securities held to maturity, Gross Unrealized Gains | 569 asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains | 475 asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains
Investment securities held to maturity, Gross Unrealized Losses | (33)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses | (102)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses
Held to Maturity, Fair Value, Total | 20,013 us-gaap_HeldToMaturitySecuritiesFairValue | 20,213 us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Agency [Member] |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |
Investment securities available for sale, Cost Basis | 5,932 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 5,931 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Investment securities available for sale, Gross Unrealized Gains | 29 asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 21 asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Investment securities available for sale, Gross Unrealized Losses | (13)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | (46)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available for Sale, Fair Value, Total | 5,948 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 5,906 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
U.S. Agency mortgage-backed securities [Member] |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |
Investment securities available for sale, Cost Basis | 97,964 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 102,888 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities available for sale, Gross Unrealized Gains | 3,385 asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 3,197 asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities available for sale, Gross Unrealized Losses | (203)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | (317)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Fair Value, Total | 101,146 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 105,768 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Cost Basis | 12,120 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 12,481 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Gross Unrealized Gains | 449 asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 395 asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities held to maturity, Gross Unrealized Losses | (15)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | (50)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to Maturity, Fair Value, Total | 12,554 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 12,826 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Corporate bonds [Member] |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |
Investment securities available for sale, Cost Basis | 15,497 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_CorporateBondSecuritiesMember | 15,497 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_CorporateBondSecuritiesMember
Investment securities available for sale, Gross Unrealized Gains | 79 asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_CorporateBondSecuritiesMember | 61 asrv_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_CorporateBondSecuritiesMember
Investment securities available for sale, Gross Unrealized Losses | (137)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_CorporateBondSecuritiesMember | (122)asrv_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAOCI / us-gaap_DebtSecurityAxis = us-gaap_CorporateBondSecuritiesMember
Available for Sale, Fair Value, Total | 15,439 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateBondSecuritiesMember | 15,436 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateBondSecuritiesMember
Taxable Municipal [Member] |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |
Investment securities held to maturity, Cost Basis | 3,362 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_TaxableMunicipalBondsMember | 3,364 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_TaxableMunicipalBondsMember
Investment securities held to maturity, Gross Unrealized Gains | 116 asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_TaxableMunicipalBondsMember | 74 asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_TaxableMunicipalBondsMember
Investment securities held to maturity, Gross Unrealized Losses |  | (24)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_TaxableMunicipalBondsMember
Held to Maturity, Fair Value, Total | 3,478 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_TaxableMunicipalBondsMember | 3,414 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_TaxableMunicipalBondsMember
Corporate bonds and other securities [Member] |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |
Investment securities held to maturity, Cost Basis | 3,995 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember | 3,995 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember
Investment securities held to maturity, Gross Unrealized Gains | 4 asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember | 6 asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember
Investment securities held to maturity, Gross Unrealized Losses | (18)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember | (28)asrv_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember
Held to Maturity, Fair Value, Total | $ 3,981 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember | $ 3,973 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember

X
- Definition Amount of accumulated pre-tax unrealized gains on investments in available-for-sale securities that are recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting unrealized gain on investments in available-for-sale securities recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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- Definition This item represents the excess of amortized cost basis over fair value of securities in a gain position and which are categorized as held-to-maturinty. + References No definition available. + Details
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- Definition This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturinty. + References No definition available. + 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 This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -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 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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