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Related Party Transactions Textuals (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transactions [Abstract]      
Related Party Transactions, Construction Contract Payments $ 100,000aubn_RelatedPartyTransactionsConstructionContractPayments $ 400,000aubn_RelatedPartyTransactionsConstructionContractPayments $ 1,200,000aubn_RelatedPartyTransactionsConstructionContractPayments
Related Party Transactions, Heat And Air Service Payments 0aubn_RelatedPartyTransactionsHeatAndAirServicePayments 0aubn_RelatedPartyTransactionsHeatAndAirServicePayments 82,000aubn_RelatedPartyTransactionsHeatAndAirServicePayments
Related Party Deposit Liabilities $ 22,000,000us-gaap_RelatedPartyDepositLiabilities $ 20,300,000us-gaap_RelatedPartyDepositLiabilities