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Securities OTTI (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Securties Other Than Temporary Impairment Charges [Abstract] |  |  |
Other Than Temporary Impairment Charges, Agency RMBS | $ 333 aubn_OtherThanTemporaryImpairmentChargesAgencyRMBS | $ 0 aubn_OtherThanTemporaryImpairmentChargesAgencyRMBS | $ 0 aubn_OtherThanTemporaryImpairmentChargesAgencyRMBS
Other Than Temporary Impairment Charges, Trust Preferred Securities | 0 aubn_OtherThanTemporaryImpairmentChargesTrustPreferredSecurities | 0 aubn_OtherThanTemporaryImpairmentChargesTrustPreferredSecurities | 130 aubn_OtherThanTemporaryImpairmentChargesTrustPreferredSecurities
Other-Than-Temporary Impairment Charges included in earnings | 333 aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings | 0 aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings | 130 aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings
Other Than Temporary Impairment On Debt Securities [Abstract] |  |  |
Credit Related Other Than Temporary Impairment Charges | 0 aubn_CreditRelatedOtherThanTemporaryImpairementCharges | 0 aubn_CreditRelatedOtherThanTemporaryImpairementCharges | 130 aubn_CreditRelatedOtherThanTemporaryImpairementCharges
Securities With Intent To Sell, Other Than Temporary Impairment Charges | 333 aubn_SecuritiesWithIntentToSellOtherThanTemporaryImpairmentCharges | 0 aubn_SecuritiesWithIntentToSellOtherThanTemporaryImpairmentCharges | 0 aubn_SecuritiesWithIntentToSellOtherThanTemporaryImpairmentCharges
Other Than Temporary Impairment Charges On Debt Securities, Total | $ 333 aubn_OtherThanTemporaryImpairmentChargesOnDebtSecurities | $ 0 aubn_OtherThanTemporaryImpairmentChargesOnDebtSecurities | $ 130 aubn_OtherThanTemporaryImpairmentChargesOnDebtSecurities

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

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

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

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

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- Definition No authoritative reference available. + References No definition available. + Details
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- Definition No authoritative reference available. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration