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Loans Receivable, Net (Summary of loans restructured as Troubled Debt Restructurings) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
loan
Mar. 31, 2014
loan
Financing Receivable, Modifications [Line Items]    
Financing Receivable Restructured, Number of Contracts 3sfdl_FinancingReceivableRestructuredNumberOfContracts 0sfdl_FinancingReceivableRestructuredNumberOfContracts
Financing Receivable, Pre Modification Recorded Investment $ 840,292sfdl_FinancingReceivablePreModificationRecordedInvestment $ 0sfdl_FinancingReceivablePreModificationRecordedInvestment
Financing Receivable, Post Modification Recorded Investment 840,292sfdl_FinancingReceivablePostModificationRecordedInvestment 0sfdl_FinancingReceivablePostModificationRecordedInvestment
Residential Real Estate 1 [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Restructured, Number of Contracts 0sfdl_FinancingReceivableRestructuredNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ResidentialRealEstate1Member		 0sfdl_FinancingReceivableRestructuredNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ResidentialRealEstate1Member
Financing Receivable, Pre Modification Recorded Investment 0sfdl_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ResidentialRealEstate1Member		 0sfdl_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ResidentialRealEstate1Member
Financing Receivable, Post Modification Recorded Investment 0sfdl_FinancingReceivablePostModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ResidentialRealEstate1Member		 0sfdl_FinancingReceivablePostModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ResidentialRealEstate1Member
Consumer [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Restructured, Number of Contracts 0sfdl_FinancingReceivableRestructuredNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ConsumerMember		 0sfdl_FinancingReceivableRestructuredNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ConsumerMember
Financing Receivable, Pre Modification Recorded Investment 0sfdl_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ConsumerMember		 0sfdl_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ConsumerMember
Financing Receivable, Post Modification Recorded Investment 0sfdl_FinancingReceivablePostModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ConsumerMember		 0sfdl_FinancingReceivablePostModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_ConsumerMember
Commercial Business [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Restructured, Number of Contracts 0sfdl_FinancingReceivableRestructuredNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialBusinessMember		 0sfdl_FinancingReceivableRestructuredNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialBusinessMember
Financing Receivable, Pre Modification Recorded Investment 0sfdl_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialBusinessMember		 0sfdl_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialBusinessMember
Financing Receivable, Post Modification Recorded Investment 0sfdl_FinancingReceivablePostModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialBusinessMember		 0sfdl_FinancingReceivablePostModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialBusinessMember
Commercial Real Estate 1 [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Restructured, Number of Contracts 3sfdl_FinancingReceivableRestructuredNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialRealEstate1Member		 0sfdl_FinancingReceivableRestructuredNumberOfContracts
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialRealEstate1Member
Financing Receivable, Pre Modification Recorded Investment 840,292sfdl_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialRealEstate1Member		 0sfdl_FinancingReceivablePreModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialRealEstate1Member
Financing Receivable, Post Modification Recorded Investment $ 840,292sfdl_FinancingReceivablePostModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialRealEstate1Member		 $ 0sfdl_FinancingReceivablePostModificationRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CommercialRealEstate1Member