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Commitment and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments to Extend Credit [Member]    
Loss Contingencies [Line Items]    
Amount of Commitment $ 49,824aubn_LossContingencyAmountOfCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CommitmentsToExtendCreditMember		 $ 38,870aubn_LossContingencyAmountOfCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CommitmentsToExtendCreditMember
Financial Standby Letter of Credit [Member]    
Loss Contingencies [Line Items]    
Amount of Commitment $ 8,337aubn_LossContingencyAmountOfCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_FinancialStandbyLetterOfCreditMember		 $ 8,562aubn_LossContingencyAmountOfCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_FinancialStandbyLetterOfCreditMember