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Loans Receivable, Net (Schedule of non-accrual loans by category) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount $ 13,741,649us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 10,012,397us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Financing Receivable, Recorded Investment, Nonaccrual Status, Percentage (1) 4.00%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage [1] 2.70%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage [1]
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount, Increase (Decrease) 3,729,252sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease  
Financing Receivable, Recorded Investment, Nonaccrual Status, Percent, Increase (Decrease) 37.20%sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease  
Residential Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount   4,607,613us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Financing Receivable, Recorded Investment, Nonaccrual Status, Percentage (1) 0.90%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		 [1] 1.30%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		 [1]
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount, Increase (Decrease) (1,546,274)sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		  
Financing Receivable, Recorded Investment, Nonaccrual Status, Percent, Increase (Decrease) (33.60%)sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		  
Commercial Business    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount   33,055us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Financing Receivable, Recorded Investment, Nonaccrual Status, Percentage (1) 0.10%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		 [1] 0.00%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		 [1]
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount, Increase (Decrease) 213,922sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		  
Financing Receivable, Recorded Investment, Nonaccrual Status, Percent, Increase (Decrease) 647.20%sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		  
Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount   4,972,667us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Financing Receivable, Recorded Investment, Nonaccrual Status, Percentage (1) 2.80%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		 [1] 1.40%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		 [1]
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount, Increase (Decrease) 4,887,022sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		  
Financing Receivable, Recorded Investment, Nonaccrual Status, Percent, Increase (Decrease) 98.30%sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		  
Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount   399,062us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Financing Receivable, Recorded Investment, Nonaccrual Status, Percentage (1) 0.20%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		 [1] 0.10%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		 [1]
Financing Receivable, Recorded Investment, Nonaccrual Status, Amount, Increase (Decrease) $ 174,582sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		  
Financing Receivable, Recorded Investment, Nonaccrual Status, Percent, Increase (Decrease) 43.70%sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		  
[1] PERCENT OF GROSS LOANS RECEIVABLE HELD FOR INVESTMENT, NET OF DEFERRED FEES AND LOANS IN PROCESS.