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Loans Receivable, Net (Financing Receivable Credit Quality Indicators) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Total $ 347,768,717us-gaap_NotesReceivableGross $ 371,385,036us-gaap_NotesReceivableGross
Residential Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 77,282,817us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
83,004,482us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total 50,391,224us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
52,205,901us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Commercial Business    
Financing Receivable, Recorded Investment [Line Items]    
Total 10,564,467us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
7,775,098us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 209,530,209us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
228,399,555us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 252,478,429us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
267,476,997us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Residential Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 69,163,911us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
74,505,587us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total 48,283,560us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
50,370,640us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Business    
Financing Receivable, Recorded Investment [Line Items]    
Total 9,691,685us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
6,807,620us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 125,339,273us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
135,793,150us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Caution [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 34,893,641us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
45,355,184us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Caution [Member] | Residential Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 956,976us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
890,902us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Caution [Member] | Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total 1,046,624us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
843,799us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Caution [Member] | Commercial Business    
Financing Receivable, Recorded Investment [Line Items]    
Total 340,706us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
368,019us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Caution [Member] | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 32,549,335us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
43,252,464us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= sfdl_CautionMember
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 36,139,924us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
26,652,950us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Residential Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 639,638us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
403,138us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total 128,033us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
143,649us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Business    
Financing Receivable, Recorded Investment [Line Items]    
Total 202,895us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
524,928us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 35,169,358us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
25,581,235us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 24,256,723us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
31,899,905us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Residential Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total 6,522,292us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
7,204,855us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total 933,007us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
847,813us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial Business    
Financing Receivable, Recorded Investment [Line Items]    
Total 329,181us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
74,531us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 16,472,243us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
$ 23,772,706us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember