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ACCUMULATED OTHER COMPREHENSIVE LOSS (Schedule of Changes in Each Component of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	$ (5,875)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		$ (5,379)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	[1]
Other comprehensive income (loss) before reclassifications	(1,437)asrv_OtherComprehensiveIncomeLossBeforeReclassifications	[1]	(802)asrv_OtherComprehensiveIncomeLossBeforeReclassifications	[1]
Amounts reclassified from accumulated other comprehensive loss	410asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss	[1]	306asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss	[1]
Other comprehensive loss	(1,027)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent		(496)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent		(1,719)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Ending balance	(6,902)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		(5,875)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		(5,379)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	[1]
Net Unrealized Gains and Losses on Investment Securities [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	1,043us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]	4,141us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]
Other comprehensive income (loss) before reclassifications	917asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]	(2,963)asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]
Amounts reclassified from accumulated other comprehensive loss	(117)asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]	(135)asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]
Other comprehensive loss	800us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]	(3,098)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]
Ending balance	1,843us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]	1,043us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember	[1]
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	(6,918)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]	(9,520)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]
Other comprehensive income (loss) before reclassifications	(2,354)asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]	2,161asrv_OtherComprehensiveIncomeLossBeforeReclassifications / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]
Amounts reclassified from accumulated other comprehensive loss	527asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]	441asrv_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]
Other comprehensive loss	(1,827)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]	2,602us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]
Ending balance	$ (8,745)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]	$ (6,918)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PensionPlansDefinedBenefitMember	[1]
[1] Amounts in parentheses indicate debits on the Consolidated Balance Sheets.

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