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DISCLOSURES ABOUT FAIR VALUE MEASUREMENTS (Schedule of Assets Measured at Fair Value on Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans	$ 989us-gaap_ImpairedFinancingReceivableRecordedInvestment	$ 3,066us-gaap_ImpairedFinancingReceivableRecordedInvestment
Fair Value Measurements, Nonrecurring Basis [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned	512us-gaap_FinancialInstrumentsOwnedOtherAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	1,017us-gaap_FinancialInstrumentsOwnedOtherAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Carrying value of impaired loans	469us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	2,253us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Measurements, Nonrecurring Basis [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation Expense	10.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	10.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Appraisal of Adjustment	30.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	30.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Measurements, Nonrecurring Basis [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation Expense	9.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	10.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Appraisal of Adjustment	55.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	38.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Measurements, Nonrecurring Basis [Member] | Minimum [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation Expense	1.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember	1.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Appraisal of Adjustment	0.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember	0.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Fair Value Measurements, Nonrecurring Basis [Member] | Minimum [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation Expense	1.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember	1.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Appraisal of Adjustment	47.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember	31.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Fair Value Measurements, Nonrecurring Basis [Member] | Maximum [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation Expense	15.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember	15.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Appraisal of Adjustment	37.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember	37.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Fair Value Measurements, Nonrecurring Basis [Member] | Maximum [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation Expense	61.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember	20.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Appraisal of Adjustment	83.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember	48.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Fair Value Measurements, Nonrecurring Basis [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned
Carrying value of impaired loans
Fair Value Measurements, Nonrecurring Basis [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned
Carrying value of impaired loans
Fair Value Measurements, Nonrecurring Basis [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other real estate owned	512us-gaap_FinancialInstrumentsOwnedOtherAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	1,017us-gaap_FinancialInstrumentsOwnedOtherAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Carrying value of impaired loans	$ 469us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	$ 2,253us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

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- Definition

Fair value appraisal of adjustments.

+ References

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- Definition

Fair value liquidation expenses.

+ References

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- Definition

The fair value as of the balance sheet date of firm holdings in other positions not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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