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Loans (Schedule of Aging of Recorded Investment in Loans) (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Accrued interest $ 5,778gabc_LoansAndLeasesReceivableAccruedInterest $ 5,590gabc_LoansAndLeasesReceivableAccruedInterest