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Trouble Debt Restructing Modified (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts	2us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-modification outstanding recorded investment	$ 708us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post -modification outstanding recorded investment	705us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Construction And Land Development Loans [Member]
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Pre-modification outstanding recorded investment	116us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Post -modification outstanding recorded investment	113us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Commercial Real Estate Other Loans [Member]
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember
Pre-modification outstanding recorded investment	592us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember
Post -modification outstanding recorded investment	592us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember
Commercial Real Estate Loans, Total [Member]
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember
Pre-modification outstanding recorded investment	592us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember
Post -modification outstanding recorded investment	$ 592us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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- Definition

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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