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Fair Value Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | $ 398,118 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | $ 378,071 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Instruments, Loans Held For Sale | 1,974 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 2,296 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Instruments, Time Deposits | 249,126 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 261,199 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Instruments, Long-term Debt | 12,217 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 12,217 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | 407,839 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 387,180 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Instruments, Loans Held For Sale | 2,044 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 2,310 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Instruments, Time Deposits | 251,365 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 263,985 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Instruments, Long-term Debt | 12,558 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 12,569 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | 0 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Instruments, Loans Held For Sale | 0 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Instruments, Time Deposits | 0 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Instruments, Long-term Debt | 0 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | 0 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Instruments, Loans Held For Sale | 2,044 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 2,310 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Instruments, Time Deposits | 251,365 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 263,985 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Instruments, Long-term Debt | 12,558 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 12,569 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | 407,839 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 387,180 aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Instruments, Loans Held For Sale | 0 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Instruments, Time Deposits | 0 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Instruments, Long-term Debt | $ 0 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 0 aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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