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Fair Value Unobservable Inputs (Details) (Fair Value, Measurements, Nonrecurring [Member], Carrying (Reported) Amount, Fair Value Disclosure [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Impaired Loans [Member]
Schedule Of Fair Value Significant Unobservable Inputs Used [Line Items]
Assets, Fair Value Disclosure	$ 3,083us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / aubn_FairValueByMeasurementTypeAxis = aubn_ImpairedLoansMember
Impaired Loans [Member] | Appraisal, Appraisal Discount [Member]
Schedule Of Fair Value Significant Unobservable Inputs Used [Line Items]
Unobservable Input, Weighted Average of Input Percent	0.169aubn_UnobservableInputWeightedAverageOfInputPercent / aubn_FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesAxis = aubn_AppraisalAppraisalDiscountMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / aubn_FairValueByMeasurementTypeAxis = aubn_ImpairedLoansMember
Other Real Estate Owned [Member]
Schedule Of Fair Value Significant Unobservable Inputs Used [Line Items]
Assets, Fair Value Disclosure	499us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / aubn_FairValueByMeasurementTypeAxis = aubn_OtherRealEstateOwnedMember
Other Real Estate Owned [Member] | Appraisal, Appraisal Discount [Member]
Schedule Of Fair Value Significant Unobservable Inputs Used [Line Items]
Unobservable Input, Weighted Average of Input Percent	0.267aubn_UnobservableInputWeightedAverageOfInputPercent / aubn_FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesAxis = aubn_AppraisalAppraisalDiscountMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / aubn_FairValueByMeasurementTypeAxis = aubn_OtherRealEstateOwnedMember
Mortgage Servicing Rights [Member]
Schedule Of Fair Value Significant Unobservable Inputs Used [Line Items]
Assets, Fair Value Disclosure	$ 2,355us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / aubn_FairValueByMeasurementTypeAxis = aubn_MortgageServicingRightsMember
Mortgage Servicing Rights [Member] | Discounted Cash Flow, Prepayment Speed [Member]
Schedule Of Fair Value Significant Unobservable Inputs Used [Line Items]
Unobservable Input, Weighted Average of Input Percent	0.105aubn_UnobservableInputWeightedAverageOfInputPercent / aubn_FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesAxis = aubn_DiscountedCashFlowPrepaymentSpeedMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / aubn_FairValueByMeasurementTypeAxis = aubn_MortgageServicingRightsMember
Mortgage Servicing Rights [Member] | Discounted Cash Flow, Discount Rate [Member]
Schedule Of Fair Value Significant Unobservable Inputs Used [Line Items]
Unobservable Input, Weighted Average of Input Percent	0.1aubn_UnobservableInputWeightedAverageOfInputPercent / aubn_FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesAxis = aubn_DiscountedCashFlowDiscountRateMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / aubn_FairValueByMeasurementTypeAxis = aubn_MortgageServicingRightsMember

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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 (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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