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Deposits (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
2015 $ 202,747us-gaap_TimeDepositMaturitiesYearOne  
2016 85,312us-gaap_TimeDepositMaturitiesYearTwo  
2017 24,692us-gaap_TimeDepositMaturitiesYearThree  
2018 14,347us-gaap_TimeDepositMaturitiesYearFour  
2019 6,327us-gaap_TimeDepositMaturitiesYearFive  
Thereafter 0us-gaap_TimeDepositMaturitiesAfterYearFive  
Total 333,425us-gaap_TimeDeposits 349,034us-gaap_TimeDeposits
Time Deposits, $250 or More 84,542us-gaap_TimeDeposits100000OrMore 66,820us-gaap_TimeDeposits100000OrMore
Time deposits originated from outside the geographic area $ 1,000gabc_TimeDeposits100000OrMoreDomesticDepositOutsideGeographicArea $ 1,648gabc_TimeDeposits100000OrMoreDomesticDepositOutsideGeographicArea