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Commitments and Off-balance Sheet Items (Narrative) (Details)
 12 Months Ended
Dec. 31, 2014
Minimum  
Commitments and Contingent Liabilities [Line Items]  
Loans and Leases Receivable Fixed Commitment Interest Rates 2.25%gabc_LoansAndLeasesReceivableFixedCommitmentInterestRates
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Loans and Leases Receivable Fixed Commitment Maturity 1 year
Maximum  
Commitments and Contingent Liabilities [Line Items]  
Loans and Leases Receivable Fixed Commitment Interest Rates 18.00%gabc_LoansAndLeasesReceivableFixedCommitmentInterestRates
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Loans and Leases Receivable Fixed Commitment Maturity 32 years