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Accumulated Other Comprehensive Loss (Changes in Each Component of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Accumulated Other Comprehensive Loss [Line Items] |  |  |  |
Beginning Balance | $ (6,902)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  | $ (5,875)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Other comprehensive income before reclassifications | 661 asrv_OtherComprehensiveIncomeLossBeforeReclassifications |  | 595 asrv_OtherComprehensiveIncomeLossBeforeReclassifications |
Amounts reclassified from accumulated other comprehensive loss |  | [1] | (34)asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss | [1]
Net current period other comprehensive income | 661 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  | 561 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
Ending Balance | (6,241)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  | (5,314)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Net Unrealized Gains and Losses on Investment Securities [Member] |  |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |  |
Beginning Balance | 1,843 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 1,043 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Other comprehensive income before reclassifications | 229 asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 339 asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Amounts reclassified from accumulated other comprehensive loss |  |  | (37)asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Net current period other comprehensive income | 229 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 302 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Ending Balance | 2,072 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 1,345 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Defined Benefit Pension Items [Member] |  |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |  |
Beginning Balance | (8,745)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |  | (6,918)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |
Other comprehensive income before reclassifications | 432 asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |  | 256 asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |
Amounts reclassified from accumulated other comprehensive loss |  |  | 3 asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |
Net current period other comprehensive income | 432 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |  | 259 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |
Ending Balance | $ (8,313)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |  | $ (6,659)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember |
[1] | These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 16 for additional details).

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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