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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Nonaccrual loan interest $ 0SGB_DeferredIncomeTaxExpenseNonaccrualLoanInterest $ 0SGB_DeferredIncomeTaxExpenseNonaccrualLoanInterest $ 9,265SGB_DeferredIncomeTaxExpenseNonaccrualLoanInterest
Foreclosed assets expenses 74,130SGB_DeferredIncomeTaxExpenseForeclosedAssetsExpenses 297,004SGB_DeferredIncomeTaxExpenseForeclosedAssetsExpenses (94,690)SGB_DeferredIncomeTaxExpenseForeclosedAssetsExpenses
Bad debt expense in excess of tax (12,441)SGB_DeferredIncomeTaxExpenseBadDebtExpenseInExcessOfTax (310,694)SGB_DeferredIncomeTaxExpenseBadDebtExpenseInExcessOfTax 86,733SGB_DeferredIncomeTaxExpenseBadDebtExpenseInExcessOfTax
Realized impairment (loss) gain on equity securities 163,625SGB_DeferredIncomeTaxExpenseRealizedImpairmentLossGainOnEquitySecurities 509,736SGB_DeferredIncomeTaxExpenseRealizedImpairmentLossGainOnEquitySecurities 0SGB_DeferredIncomeTaxExpenseRealizedImpairmentLossGainOnEquitySecurities
Accretion of discounted bonds 20,058SGB_DeferredIncomeTaxExpenseAccretionOfDiscountedBonds 9,175SGB_DeferredIncomeTaxExpenseAccretionOfDiscountedBonds 8,057SGB_DeferredIncomeTaxExpenseAccretionOfDiscountedBonds
Gain on disposition of discounted bonds (2,470)SGB_DeferredIncomeTaxExpenseGainOnDispositionOfDiscountedBonds (7,106)SGB_DeferredIncomeTaxExpenseGainOnDispositionOfDiscountedBonds (8,272)SGB_DeferredIncomeTaxExpenseGainOnDispositionOfDiscountedBonds
Book and tax depreciation difference 60,712SGB_DeferredIncomeTaxExpenseBookAndTaxDepreciationDifference (13,207)SGB_DeferredIncomeTaxExpenseBookAndTaxDepreciationDifference (48,648)SGB_DeferredIncomeTaxExpenseBookAndTaxDepreciationDifference
Total deferred taxes $ 303,614us-gaap_DeferredIncomeTaxExpenseBenefit $ 484,908us-gaap_DeferredIncomeTaxExpenseBenefit $ (47,555)us-gaap_DeferredIncomeTaxExpenseBenefit