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v2.4.1.9

Income Tax, Components of Deferred Tax Asset and Liability (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Deferred Tax Assets, Gross [Abstract] |  |  |  |
Deferred Tax Asset, Allowance For Loan Loss | $ 1,784 aubn_DeferredTaxAssetAllowanceForLoanLoss | $ 1,944 aubn_DeferredTaxAssetAllowanceForLoanLoss |  |
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross | 0 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 2,661 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross |  |
Deferred Tax Assets, Other Real Estate Owned Write-downs | 20 aubn_DeferredTaxAssetsOtherRealEstateOwnedWriteDowns | 282 aubn_DeferredTaxAssetsOtherRealEstateOwnedWriteDowns |  |
Deferred Tax Assets, Tax Credit Carryforwards, Other | 816 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther | 1,137 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther |  |
Deferred Tax Assets, Other | 480 us-gaap_DeferredTaxAssetsOther | 531 us-gaap_DeferredTaxAssetsOther |  |
Deferred Tax Assets, Gross | 3,100 us-gaap_DeferredTaxAssetsGross | 6,555 us-gaap_DeferredTaxAssetsGross |  |
Deferred Tax Liabilities [Abstract] |  |  |  |
Deferred Tax Liabilities, Property, Plant and Equipment | 69 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 90 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  |
Deferred Tax Liabilities, Unrealized Gains on Available-for-Sale Securities, Gross | 1,427 aubn_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecuritiesGross | 0 aubn_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecuritiesGross |  |
Deferred Tax Liabilities, Originated Mortgage Servicing Rights | 881 aubn_DeferredTaxLiabilitiesOriginatedMortgageServicingRights | 867 aubn_DeferredTaxLiabilitiesOriginatedMortgageServicingRights |  |
Deferred Tax Liabilities, Other | 204 us-gaap_DeferredTaxLiabilitiesOther | 205 us-gaap_DeferredTaxLiabilitiesOther |  |
Deferred Income Tax Liabilities, Gross, Total | 2,581 us-gaap_DeferredIncomeTaxLiabilities | 1,162 us-gaap_DeferredIncomeTaxLiabilities |  |
Deferred Tax Assets (Liabilities), Net | $ 519 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 5,393 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 1,244 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 2,425 us-gaap_DeferredTaxAssetsLiabilitiesNet

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