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Commitment and Contingencies (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Commitments to Extend Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Amount of Commitment | $ 74,970 | $ 60,564
Financial Standby Letter of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Amount of Commitment | $ 1,237 | $ 1,921

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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: |