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Long-Term Debt Textuals (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Long-term debt: |  |
Securities Pledged For Long-term FHLB Advances | $ 0 aubn_SecuritiesPledgedForLongTermFhlbAdvances | $ 1.0 aubn_SecuritiesPledgedForLongTermFhlbAdvances
Qualifying Residential Mortgages Pledged For Long-Term Advances | $ 35.4 aubn_QualifyingResidentialMortgagesPledgedForLongTermAdvances | $ 42.1 aubn_QualifyingResidentialMortgagesPledgedForLongTermAdvances

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | aubn_QualifyingResidentialMortgagesPledgedForLongTermAdvances
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of pledged securities used to secure Federal Home Loan Bank (FHLB) long-term advances + References No definition available. + Details
Name: | aubn_SecuritiesPledgedForLongTermFhlbAdvances
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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