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Loans Receivable, Net (Schedule of loans evaluated individually for impairment and collectively evaluated for impairment in loans receivable) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment $ 20,247,955us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment $ 31,354,814us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Collectively Evaluated For Impairment 327,520,762us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment 340,030,222us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Total 347,768,717us-gaap_NotesReceivableGross 371,385,036us-gaap_NotesReceivableGross
Residential Real Estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment 2,519,814us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
4,838,236us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Collectively Evaluated For Impairment 74,763,003us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
78,166,246us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Total 77,282,817us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
83,004,482us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Consumer    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment 218,232us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
275,491us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Collectively Evaluated For Impairment 50,172,992us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
51,930,410us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
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, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment 236,030us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
19,775us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Collectively Evaluated For Impairment 10,328,437us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
7,755,323us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
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, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment 17,273,879us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
26,221,312us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Collectively Evaluated For Impairment 192,256,330us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
202,178,243us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Total $ 209,530,209us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
$ 228,399,555us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member