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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
	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	661asrv_OtherComprehensiveIncomeLossBeforeReclassifications		595asrv_OtherComprehensiveIncomeLossBeforeReclassifications
Amounts reclassified from accumulated other comprehensive loss		[1]	(34)asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss	[1]
Net current period other comprehensive income	661us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent		561us-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	1,843us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		1,043us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Other comprehensive income before reclassifications	229asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		339asrv_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	229us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		302us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Ending Balance	2,072us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		1,345us-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	432asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember		256asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember
Amounts reclassified from accumulated other comprehensive loss			3asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember
Net current period other comprehensive income	432us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember		259us-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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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

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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