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Securities OTTI (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Debt Securties Other Than Temporary Impairment Charges [Abstract] |  |
Other Than Temporary Impairment Charges, Agency RMBS | $ 0aubn_OtherThanTemporaryImpairmentChargesAgencyRmbs | $ 333aubn_OtherThanTemporaryImpairmentChargesAgencyRmbs
Other Than Temporary Impairment Charges, Debt Securities Total | 0aubn_OtherThanTemporaryImpairmentChargesDebtSecuritiesTotal | 333aubn_OtherThanTemporaryImpairmentChargesDebtSecuritiesTotal
Other-Than-Temporary Impairment Charges included in earnings | 0aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings | 333aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings
Other Than Temporary Impairment On Debt Securities [Abstract] |  |
Other Than Temporary Impairment, Securities With Intent To Sell | 0aubn_OtherThanTemporaryImpairmentSecuritiesWithIntentToSell | 333aubn_OtherThanTemporaryImpairmentSecuritiesWithIntentToSell
Other Than Temporary Impairment Charges On Debt Securities, Total | $ 0aubn_OtherThanTemporaryImpairmentChargesOnDebtSecurities | $ 333aubn_OtherThanTemporaryImpairmentChargesOnDebtSecurities

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

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

X
- Definition Impairment charges recorded on debt securities during the period. + References No definition available. + Details
Name: | aubn_OtherThanTemporaryImpairmentChargesDebtSecuritiesTotal
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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

X
- Definition OTTI recorded related to securities that the company intends to sell. + References No definition available. + Details
Name: | aubn_OtherThanTemporaryImpairmentSecuritiesWithIntentToSell
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration