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Loans Receivable, Net (Schedule of loans evaluated individually for impairment and collectively evaluated for impairment in the allowance for loan losses) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment $ 475,000us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 $ 1,102,558us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Collectively Evaluated For Impairment 7,882,496us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment 9,139,412us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Total 8,357,496us-gaap_FinancingReceivableAllowanceForCreditLosses 10,241,970us-gaap_FinancingReceivableAllowanceForCreditLosses
Residential Real Estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment 0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
158,791us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Collectively Evaluated For Impairment 1,392,065us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
1,547,852us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Total 1,392,065us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
1,706,643us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Consumer    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment 2,600us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
103,109us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Collectively Evaluated For Impairment 884,116us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
744,668us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Total 886,716us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
847,777us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Commercial Business    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment 0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Collectively Evaluated For Impairment 159,353us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
426,658us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Total 159,353us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
426,658us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Commercial Real Estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually Evaluated For Impairment 472,400us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
840,658us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Collectively Evaluated For Impairment 5,446,962us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
6,420,234us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Total $ 5,919,362us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
$ 7,260,892us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member