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Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Pre-Tax Amount [Member] |  |  |
Schedule Of Other Comprehesive Income [Line Items] |  |  |
Unrealized Net Holding Gain (Loss) On All Other Securitiies | $ 10,553 aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember | $ (14,761)aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember | $ 2,188 aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember
Reclassification adjustment for loss (gain) on securities recognized in earnings | 530 aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember | (651)aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember | (679)aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember
Other Comprehensive Income (Loss) | 11,083 aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember | (15,412)aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember | 1,509 aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_PreTaxAmountMember
Tax Benefit (Expense) [Member] |  |  |
Schedule Of Other Comprehesive Income [Line Items] |  |  |
Unrealized Net Holding Gain (Loss) On All Other Securitiies | (3,893)aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember | 5,446 aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember | (809)aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember
Reclassification adjustment for loss (gain) on securities recognized in earnings | (195)aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember | 240 aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember | 252 aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember
Other Comprehensive Income (Loss) | (4,088)aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember | 5,686 aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember | (557)aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_TaxBenefitExpenseMember
Net Of Tax Amount [Member] |  |  |
Schedule Of Other Comprehesive Income [Line Items] |  |  |
Unrealized Net Holding Gain (Loss) On All Other Securitiies | 6,660 aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember | (9,315)aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember | 1,379 aubn_UnrealizedNetHoldingGainLossOnAllOtherSecuritiies / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember
Reclassification adjustment for loss (gain) on securities recognized in earnings | 335 aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember | (411)aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember | (427)aubn_ReclassificationAdjustmentForNetGainOnSecuritiesRecognizedInNetEarnings / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember
Other Comprehensive Income (Loss) | $ 6,995 aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember | $ (9,726)aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember | $ 952 aubn_OtherComprehensiveIncomeLoss / aubn_ScheduleOfOtherComprehensiveIncomeAxis = aubn_NetOfTaxAmountMember

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