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Securities Gross Realized Gain Loss (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Available-for-sale Securities, Gross Realized Gains $ 467us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 745us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 1,005us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Available-for-sale Securities, Gross Realized Losses (664)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (94)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (196)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Other-Than-Temporary Impairment Charges included in earnings (333)aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings 0aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings (130)aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings
Available-for-sale Securities, Gross Realized Gain (Loss), Net $ (530)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet $ 651us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet $ 679us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet