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Securities (Proceeds from the sales of Available-for-Sale Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Investments [Line Items]    
Proceeds from Sales $ 9,808us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 254us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross Gains on Sales 463us-gaap_GainLossOnSaleOfSecuritiesNet 228us-gaap_GainLossOnSaleOfSecuritiesNet
Sale of Securities    
Schedule of Investments [Line Items]    
Proceeds from Sales 9,808us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 254us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Gross Gains on Sales 463us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 228us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Income Taxes on Gross Gains $ 162gabc_IncomeTaxGrossGains
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 $ 80gabc_IncomeTaxGrossGains
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember