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Short-term Borrowings (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Federal Funds Purchased [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term Debt | $ 0 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | $ 0 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | $ 0 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Short-term Debt, Weighted Average Interest Rate | 0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | 0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | 0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Short-term Debt, Average Outstanding Amount | 16 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | 43 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | 225 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Short-term Debt, Weighted Average Interest Rate During Year | 0.90%aubn_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | 0.92%aubn_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | 0.96%aubn_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Short-term Debt, Maximum Month-end Outstanding Amount | 0 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | 2,376 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember | 1,925 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Securities Sold under Agreements to Repurchase [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term Debt | 4,681 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 3,363 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 2,689 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Short-term Debt, Weighted Average Interest Rate | 0.50%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 0.50%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 0.50%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Short-term Debt, Average Outstanding Amount | 3,797 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 2,774 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 2,746 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Short-term Debt, Weighted Average Interest Rate During Year | 0.50%aubn_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 0.50%aubn_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | 0.50%aubn_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Short-term Debt, Maximum Month-end Outstanding Amount | $ 4,681 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | $ 3,363 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | $ 3,174 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember

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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument on average outstanding balance during the year. + References No definition available. + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References No definition available. + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section VII -Subsection 2 + Details
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- Definition Weighted average interest rate of short-term debt outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph b -Article 5 + Details
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