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Allowance For Loan Loss Additional Information (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Financing Receivable Allowance For Credit Loss Additional Information [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | $ 4,642 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment | $ 5,008 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Financing Receivable, Collectively Evaluated for Impairment | 400,338 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 378,213 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 194 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 | 260 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Financing Receivable, Individually Evaluated for Impairment | 3,271 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | 5,565 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Allowance for loan losses | 4,836 us-gaap_LoansAndLeasesReceivableAllowance | 5,268 us-gaap_LoansAndLeasesReceivableAllowance
Loans and Leases Receivable, Gross, Carrying Amount | 403,609 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | 383,778 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial and Industrial Loans [Member] |  |
Financing Receivable Allowance For Credit Loss Additional Information [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 639 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember | 386 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Financing Receivable, Collectively Evaluated for Impairment | 54,259 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember | 57,656 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Financing Receivable, Individually Evaluated for Impairment | 70 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember | 124 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Allowance for loan losses | 639 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember | 386 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Loans and Leases Receivable, Gross, Carrying Amount | 54,329 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember | 57,780 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Construction And Land Development Loans [Member] |  |
Financing Receivable Allowance For Credit Loss Additional Information [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 974 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 278 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Financing Receivable, Collectively Evaluated for Impairment | 36,693 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 34,897 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 88 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Financing Receivable, Individually Evaluated for Impairment | 605 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 1,582 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Allowance for loan losses | 974 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 366 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Loans and Leases Receivable, Gross, Carrying Amount | 37,298 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 36,479 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Commercial Real Estate Loans, Total [Member] |  |
Financing Receivable Allowance For Credit Loss Additional Information [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 1,734 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember | 3,014 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Financing Receivable, Collectively Evaluated for Impairment | 190,306 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember | 171,987 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 194 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember | 172 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Financing Receivable, Individually Evaluated for Impairment | 1,700 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember | 2,933 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Allowance for loan losses | 1,928 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember | 3,186 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Loans and Leases Receivable, Gross, Carrying Amount | 192,006 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember | 174,920 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Residential Real Estate Loans, Total [Member] |  |
Financing Receivable Allowance For Credit Loss Additional Information [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 1,119 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember | 1,114 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember
Financing Receivable, Collectively Evaluated for Impairment | 106,745 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember | 100,780 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember
Financing Receivable, Individually Evaluated for Impairment | 896 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember | 926 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember
Allowance for loan losses | 1,119 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember | 1,114 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember
Loans and Leases Receivable, Gross, Carrying Amount | 107,641 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember | 101,706 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember
Consumer Installment and Revolving Loans [Member] |  |
Financing Receivable Allowance For Credit Loss Additional Information [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 176 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | 216 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember
Financing Receivable, Collectively Evaluated for Impairment | 12,335 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | 12,893 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember
Financing Receivable, Individually Evaluated for Impairment | 0 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | 0 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember
Allowance for loan losses | 176 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | 216 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember
Loans and Leases Receivable, Gross, Carrying Amount | $ 12,335 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | $ 12,893 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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