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Accumulated Other Comprehensive Loss (Amounts Reclassified out of Each Component of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Unrealized gains and losses on sale of securities:    
Net realized gains on available for sale securities    $ (57)us-gaap_GainLossOnSaleOfInvestments
Provision for income tax expense    20us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Net of tax    (37)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Amortization of defined benefit items    
Amortization of prior year service cost    [1] 5us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit [1]
Provision for income tax expense    [1] (2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax [1]
Net of tax    [1] 3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [1]
Total reclassifications for the period    [1] $ (34)asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss [1]
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 16 for additional details).