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Disclosures about Fair Value Measurements (Assets Measured at Fair Value on Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying value of impaired loans | 1,017 us-gaap_ImpairedFinancingReceivableRecordedInvestment |  | 989 us-gaap_ImpairedFinancingReceivableRecordedInvestment |
Fair Value Measurements, Nonrecurring Basis [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other real estate owned | 563 us-gaap_FinancialInstrumentsOwnedOtherAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 512 us-gaap_FinancialInstrumentsOwnedOtherAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Carrying value of impaired loans | 515 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 469 us-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 expenses | 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 |
Valuation Techniques | Appraisal of collateral | [1],[2] | Appraisal of collateral | [1],[2]
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 expenses | 10.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 9.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Valuation Techniques | Appraisal of collateral | [1],[2] | Appraisal of collateral | [1],[2]
Appraisal of Adjustment | 38.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 55.00%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 expenses | 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 expenses | 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 | 0.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 47.00%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 expenses | 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 | 35.00%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 expenses | 20.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 61.00%asrv_FairValueLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Appraisal of Adjustment | 48.00%asrv_FairValueAppraisalOfAdjustments / us-gaap_FairValueByAssetClassAxis = asrv_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 83.00%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 | 563 us-gaap_FinancialInstrumentsOwnedOtherAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 512 us-gaap_FinancialInstrumentsOwnedOtherAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Carrying value of impaired loans | 515 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 469 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
[1] | Includes qualitative adjustments by management and estimated liquidation expenses.
[2] | Fair Value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable.

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- Definition Fair value liquidation expenses. + References No definition available. + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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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 + Details
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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 + Details
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