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Long-Term Debt (Details Narrative) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Pledged to secure $ 34,813,653us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 $ 31,594,920us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
FHLB Stock held on membership 336,000SGB_FederalHomeLoanBankStockHeldOnMembership 416,000SGB_FederalHomeLoanBankStockHeldOnMembership
FHLB Stock held on advances 1,224,000SGB_FederalHomeLoanBankStockHeldOnAdvances 1,305,000SGB_FederalHomeLoanBankStockHeldOnAdvances
Unused lines of credit 66,200,000SGB_FederalHomeLoanBankUnusedLinesOfCredit  
Maturities of long term debt convertible 11,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Two Advances [Member]    
Maturities of long term debt convertible $ 10,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_DebtInstrumentAxis
= SGB_TwoAdvancesMember