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Fair Value Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | $ 391,891aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | $ 398,118aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Instruments, Loans Held For Sale | 3,549aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 1,974aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Liabilities: [Abstract] |  |
Fair Value, Financial Instruments, Time Deposits | 238,670aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 249,126aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Instruments, Long-term Debt | 7,217aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 12,217aubn_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 | 401,679aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 407,839aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Instruments, Loans Held For Sale | 3,647aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 2,044aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Liabilities: [Abstract] |  |
Fair Value, Financial Instruments, Time Deposits | 241,216aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 251,365aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Instruments, Long-term Debt | 7,217aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 12,558aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | 0aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Instruments, Loans Held For Sale | 0aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Liabilities: [Abstract] |  |
Fair Value, Financial Instruments, Time Deposits | 0aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Instruments, Long-term Debt | 0aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | 0aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Instruments, Loans Held For Sale | 3,647aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 2,044aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Liabilities: [Abstract] |  |
Fair Value, Financial Instruments, Time Deposits | 241,216aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 251,365aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Instruments, Long-term Debt | 7,217aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 12,558aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Financial Assets: [Abstract] |  |
Fair Value, Financial Instruments, Loans, Net | 401,679aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 407,839aubn_FairValueFinancialInstrumentsLoansNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Instruments, Loans Held For Sale | 0aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0aubn_FairValueFinancialInstrumentsLoansHeldForSale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Liabilities: [Abstract] |  |
Fair Value, Financial Instruments, Time Deposits | 0aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0aubn_FairValueFinancialInstrumentsTimeDeposits / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Instruments, Long-term Debt | $ 0aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 0aubn_FairValueFinancialInstrumentsLongTermDebt / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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