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Fair Value Measurements and Disclosures (Details Narrative)
Dec. 31, 2014
Minimum [Member]  
Percentage of estimated selling cost range 15.00%SGB_PercentageOfEstimatedSellingCostRange
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Percentage of nonaccrual impaired loan write down range 80.00%SGB_PercentageOfNonaccrualImpairedLoanWriteDownRange
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]  
Percentage of estimated selling cost range 20.00%SGB_PercentageOfEstimatedSellingCostRange
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Percentage of nonaccrual impaired loan write down range 85.00%SGB_PercentageOfNonaccrualImpairedLoanWriteDownRange
/ us-gaap_RangeAxis
= us-gaap_MaximumMember