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Carrying Amounts and Fair Value of Financial Instruments (Significant unobservable inputs used in the fair value measurements) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Other Real Estate Owned $ 6,486,850us-gaap_OtherRealEstateAndForeclosedAssets $ 3,229,710us-gaap_OtherRealEstateAndForeclosedAssets
Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 23,690,406us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
24,867,664us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 15,324,712us-gaap_AssetsFairValueDisclosureNonrecurring
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[1] 19,772,955us-gaap_AssetsFairValueDisclosureNonrecurring
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[2]
Fair Value Measurements, Valuation Techniques Appraised Value  
Significant Unobservable Inputs Discount Rates/ Discounts to Appraised Values  
Foreclosed Assets | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 6,486,850us-gaap_AssetsFairValueDisclosureNonrecurring
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ForeclosedAssetsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
3,229,710us-gaap_AssetsFairValueDisclosureNonrecurring
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ForeclosedAssetsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Measurements, Valuation Techniques Appraised Value/Comparable Sales  
Significant Unobservable Inputs Discount Rates/ Discounts to Appraised Values  
Minimum | Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Significant Unobservable Inputs, Percentage Range 0.00%sfdl_SignificantUnobservableInputsPercentageRange
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Minimum | Foreclosed Assets | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Significant Unobservable Inputs, Percentage Range 12.00%sfdl_SignificantUnobservableInputsPercentageRange
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ForeclosedAssetsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum | Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Significant Unobservable Inputs, Percentage Range 70.00%sfdl_SignificantUnobservableInputsPercentageRange
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maximum | Foreclosed Assets | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Significant Unobservable Inputs, Percentage Range 79.00%sfdl_SignificantUnobservableInputsPercentageRange
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ForeclosedAssetsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 21,811,562us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
23,002,665us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value, Inputs, Level 3 | Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 15,324,712us-gaap_AssetsFairValueDisclosureNonrecurring
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[1] 19,772,955us-gaap_AssetsFairValueDisclosureNonrecurring
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[2]
Fair Value, Inputs, Level 3 | Foreclosed Assets | Fair Value, Measurements, Nonrecurring    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring   3,229,710us-gaap_AssetsFairValueDisclosureNonrecurring
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ForeclosedAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Other Real Estate Owned $ 6,486,850us-gaap_OtherRealEstateAndForeclosedAssets
/ sfdl_FairValueAssetsAndLiabilitiesNonrecurringBasisAxis
= sfdl_ForeclosedAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmJiYzJjYTc2ZDI4OTRiMzc5NTQ5Y2U3YjU3MTFhYmQ1fFRleHRTZWxlY3Rpb246NTUzNjVGQzYzNUY4N0FGQjREMzA3NTQ3NDQwN0FFQ0EM}
[2] IMPAIRED LOANS ARE REPORTED NET OF SPECIFIC RESERVES OF $475,000