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Short-Term Borrowed Funds (Details Narrative) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Unused federal funds $ 83,700,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds  
Fair value of FHLB advances 27,621,000us-gaap_FederalHomeLoanBankAdvances 29,572,000us-gaap_FederalHomeLoanBankAdvances
Other Short Term Borrowed Funds [Member]    
Fair value of FHLB advances $ 5,133,333,000us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_DebtInstrumentAxis
= SGB_OtherShortTermBorrowedFundsMember
$ 11,800,000us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_DebtInstrumentAxis
= SGB_OtherShortTermBorrowedFundsMember
FHLB advances, interest rate 1.08%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
/ us-gaap_DebtInstrumentAxis
= SGB_OtherShortTermBorrowedFundsMember
3.48%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
/ us-gaap_DebtInstrumentAxis
= SGB_OtherShortTermBorrowedFundsMember