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Commitment and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commitments to Extend Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Amount of Commitment | $ 49,824 aubn_LossContingencyAmountOfCommitment / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_CommitmentsToExtendCreditMember | $ 38,870 aubn_LossContingencyAmountOfCommitment / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_CommitmentsToExtendCreditMember
Financial Standby Letter of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Amount of Commitment | $ 8,337 aubn_LossContingencyAmountOfCommitment / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember | $ 8,562 aubn_LossContingencyAmountOfCommitment / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialStandbyLetterOfCreditMember

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- Definition Amount of unused extension of credit for loan commitments and standby letters of Credit + References No definition available. + Details
Name: | aubn_LossContingencyAmountOfCommitment
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |