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Securities OTTI (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Debt Securties Other Than Temporary Impairment Charges [Abstract]    
Other Than Temporary Impairment Charges, Agency RMBS $ 0aubn_OtherThanTemporaryImpairmentChargesAgencyRmbs $ 333aubn_OtherThanTemporaryImpairmentChargesAgencyRmbs
Other Than Temporary Impairment Charges, Debt Securities Total 0aubn_OtherThanTemporaryImpairmentChargesDebtSecuritiesTotal 333aubn_OtherThanTemporaryImpairmentChargesDebtSecuritiesTotal
Other-Than-Temporary Impairment Charges included in earnings 0aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings 333aubn_OtherThanTemporaryImpairmentChargesIncludedInEarnings
Other Than Temporary Impairment On Debt Securities [Abstract]    
Other Than Temporary Impairment, Securities With Intent To Sell 0aubn_OtherThanTemporaryImpairmentSecuritiesWithIntentToSell 333aubn_OtherThanTemporaryImpairmentSecuritiesWithIntentToSell
Other Than Temporary Impairment Charges On Debt Securities, Total $ 0aubn_OtherThanTemporaryImpairmentChargesOnDebtSecurities $ 333aubn_OtherThanTemporaryImpairmentChargesOnDebtSecurities