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Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructuring by Loan Class (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current [Member]    
Troubled Debt Restructuring $ 3,589SGB_FinancingReceivablesTroubledDebtRestructuringAsAccrualAndNonaccrual
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