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Loans (Troubled Debt Restructurings, Subsequently Defaulted) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
loan
Mar. 31, 2014
loan
Financing Receivable, Modifications [Line Items]    
Number of Loans 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Recorded Investment $ 95us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Commercial and Industrial Loans and Leases    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= gabc_CommercialAndIndustrialLoansandLeasesMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= gabc_CommercialAndIndustrialLoansandLeasesMember
Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= gabc_CommercialAndIndustrialLoansandLeasesMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= gabc_CommercialAndIndustrialLoansandLeasesMember
Commercial Real Estate Loans    
Financing Receivable, Modifications [Line Items]    
Number of Loans 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Recorded Investment $ 95us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember