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Loans Receivable, Net (Financing Receivable Credit Quality Indicators) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross $ 340,012,364us-gaap_NotesReceivableGross $ 347,768,717us-gaap_NotesReceivableGross
Residential Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 76,077,084us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		 77,282,817us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 50,385,443us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		 50,391,224us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Commercial Business [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 8,902,887us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		 10,564,467us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Commercial Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 204,646,950us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		 209,530,209us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 20,059,650us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 24,256,723us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Residential Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 6,159,111us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 6,522,292us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 1,195,284us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 933,007us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial Business [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 443,037us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 329,181us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 12,262,218us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 16,472,243us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 38,368,373us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 36,139,924us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Residential Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 1,422,850us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 639,638us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 175,250us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 128,033us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Business [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 303,389us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 202,895us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 36,466,884us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 35,169,358us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Caution [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 34,768,604us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember		 34,893,641us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Caution [Member] | Residential Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 914,752us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember		 956,976us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Caution [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 1,547,751us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember		 1,046,624us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Caution [Member] | Commercial Business [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 346,482us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember		 340,706us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Caution [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 31,959,619us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember		 32,549,335us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 246,815,737us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 252,478,429us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Residential Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 67,580,371us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 69,163,911us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 47,467,158us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 48,283,560us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Business [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross 7,809,979us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 9,691,685us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Real Estate 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Gross $ 123,958,229us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 $ 125,339,273us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember