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Securities Gross Realized Gain Loss (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 | $ 467 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 745 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 1,005 us-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 | 0 aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings | (130)aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings
Available-for-sale Securities, Gross Realized Gain (Loss), Net | $ (530)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 651 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 679 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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Namespace Prefix: | us-gaap_
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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