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Variable Interest Entities Textuals (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Variable Interest Entities (Textuals) [Abstract]  
Trust Preferred Securities, Issued $ 7.0aubn_TrustPreferredSecuritiesIssued
Junior Subordinated, Issued 7.2us-gaap_JuniorSubordinatedNotes
Equity Interest, ANB Capital Trust $ 0.2aubn_EquityInterestAnbCapitalTrust