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Deposits - Schedule of Maturities of Certificates of Deposits (Details) (USD $)
Dec. 31, 2014
Maturities of certificates of deposit $ 77,666,763SGB_MaturitiesOfCertificatesOfDeposit
2015 [Member]  
Maturities of certificates of deposit 64,007,725SGB_MaturitiesOfCertificatesOfDeposit
/ SGB_FiniteLivedIntangibleAssetsForSucceedingPeriodAxis
= SGB_TwoThousandFifteenMember
2016 [Member]  
Maturities of certificates of deposit 7,060,175SGB_MaturitiesOfCertificatesOfDeposit
/ SGB_FiniteLivedIntangibleAssetsForSucceedingPeriodAxis
= SGB_TwoThousandSixteenMember
2017 [Member]  
Maturities of certificates of deposit 5,593,141SGB_MaturitiesOfCertificatesOfDeposit
/ SGB_FiniteLivedIntangibleAssetsForSucceedingPeriodAxis
= SGB_TwoThousandSeventeenMember
2018 [Member]  
Maturities of certificates of deposit 942,251SGB_MaturitiesOfCertificatesOfDeposit
/ SGB_FiniteLivedIntangibleAssetsForSucceedingPeriodAxis
= SGB_TwoThousandEightteenMember
2019 And There After [Member]  
Maturities of certificates of deposit $ 63,471SGB_MaturitiesOfCertificatesOfDeposit
/ SGB_FiniteLivedIntangibleAssetsForSucceedingPeriodAxis
= SGB_TwoThousandNineTeenAndThereAfterMember