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Variable Interest Entities Textuals (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012
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Variable interest entity [Abstract] |
Trust Preferred Securities, Issued | $ 7.00
Junior Subordinated Debt, Issued | $ 7.20

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

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

X
- Details
Name: | aubn_VariableInterestEntityAbstract
Namespace Prefix: | aubn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration