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Summary of Significant Accounting Policies (Details Narrative) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jul. 31, 2013
Accounting Policies [Abstract]        
Maximum FDIC insured amount $ 250,000us-gaap_CashFDICInsuredAmount      
Uninsured deposits 472,142us-gaap_CashUninsuredAmount      
Foreclosed asset valuation allowance 0SGB_ForeclosedAssetsValuationAllowance      
Remaining life of intangible useful life 5 years      
Bank owned life insurance policies 5,120,335us-gaap_BankOwnedLifeInsurance 4,992,664us-gaap_BankOwnedLifeInsurance 5,104,173us-gaap_BankOwnedLifeInsurance  
Bank owned life insurance policies, stockholders equity, percentage 14.50%SGB_BankOwnedLifeInsurancePoliciesStockholdersEquityPercentage 15.50%SGB_BankOwnedLifeInsurancePoliciesStockholdersEquityPercentage    
Commercial mortgage banking services 32,000,000us-gaap_FeesAndCommissionsMortgageBanking      
Advertising expense 33,377us-gaap_AdvertisingExpense 43,491us-gaap_AdvertisingExpense    
Total consolidated assets       $ 500,000,000us-gaap_RegulatoryAssets
Minimum requirement of common equity Tier 1 risk-based capital ratio 4.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets      
Tier 1 risk-based capital ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets      
Previous minimum requirement of tier 1 risk-based capital ratio 4.00%us-gaap_ExcessCapitalToRiskWeightedAssets      
Minimum requirement of total risk-based capital ratio 8.00%us-gaap_CapitalToRiskWeightedAssets      
Minimum requirement of tier 1 leverage ratio 4.00%us-gaap_ExcessTierOneRiskBasedCapitalToRiskWeightedAssets