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Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings By Types of Concessions Made (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accuring [Member]    
Payment modification $ 175,718SGB_FinancingReceivableModificationsPaymentModification
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
$ 36,079SGB_FinancingReceivableModificationsPaymentModification
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
Rate reduction 0SGB_FinancingReceivableModificationsRateReduction
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
4,131SGB_FinancingReceivableModificationsRateReduction
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
Rate reduction, payment modification 8,001SGB_FinancingReceivableModificationsRateReductionPaymentModification
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
215,489SGB_FinancingReceivableModificationsRateReductionPaymentModification
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
Forbearance of interest 31,713SGB_FinancingReceivableModificationsForbearanceOfInterest
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
0SGB_FinancingReceivableModificationsForbearanceOfInterest
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
Total 215,432SGB_FinancingReceivablesTroubledDebtRestructuringAsAccrualAndNonaccrual
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
255,699SGB_FinancingReceivablesTroubledDebtRestructuringAsAccrualAndNonaccrual
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_AccuringMember
Non-accuring [Member]    
Payment modification 0SGB_FinancingReceivableModificationsPaymentModification
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
0SGB_FinancingReceivableModificationsPaymentModification
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
Rate reduction 0SGB_FinancingReceivableModificationsRateReduction
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
0SGB_FinancingReceivableModificationsRateReduction
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
Rate reduction, payment modification 0SGB_FinancingReceivableModificationsRateReductionPaymentModification
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
0SGB_FinancingReceivableModificationsRateReductionPaymentModification
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
Forbearance of interest 0SGB_FinancingReceivableModificationsForbearanceOfInterest
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
118,537SGB_FinancingReceivableModificationsForbearanceOfInterest
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
Total $ 0SGB_FinancingReceivablesTroubledDebtRestructuringAsAccrualAndNonaccrual
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember
$ 118,537SGB_FinancingReceivablesTroubledDebtRestructuringAsAccrualAndNonaccrual
/ SGB_FinancialReceivablesTroubledDebtRestructuringByClassAxis
= SGB_NonaccuringMember