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Investment Securities (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Integer
Dec. 31, 2013
Integer
Dec. 31, 2012
Schedule of Investments [Abstract]      
Securities with a carrying value pledged as collateral $ 64,233,906us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral $ 50,537,648us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral  
Securities with a carrying value pledged as collateral, market value 65,166,684SGB_AvailableForSaleSecuritiesPledgedAsCollateralMarketValue 50,251,358SGB_AvailableForSaleSecuritiesPledgedAsCollateralMarketValue  
Securities overpledged 20,700,000SGB_AvailableForSaleSecuritiesOverPledgedAndReleasedForLiquidityNeeds    
Federal Home Loan Bank stock, at cost 1,560,000us-gaap_FederalHomeLoanBankStock 1,721,000us-gaap_FederalHomeLoanBankStock  
Proceeds from sale of securities available for sale 2,208,318us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity 442,600us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity 8,833,839us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Reported net realized gains $ 293,508us-gaap_GainLossOnSaleOfSecuritiesNet $ 311,800us-gaap_GainLossOnSaleOfSecuritiesNet $ 337,804us-gaap_GainLossOnSaleOfSecuritiesNet
Available-for-sale Securities, number of debt securities 54SGB_AvailableforsaleSecuritiesNumberOfDebtSecurities 94SGB_AvailableforsaleSecuritiesNumberOfDebtSecurities  
Debt securities, unrealized losses with aggregate depreciation on amortized cost basis, percentage 1.27%SGB_DebtSecuritiesUnrealizedLossesWithAggregateDepreciationOnAmortizedCostBasisPercentage 2.84%SGB_DebtSecuritiesUnrealizedLossesWithAggregateDepreciationOnAmortizedCostBasisPercentage