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Loans Receivable, Net (Schedule of non-accrual loans by category) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status $ 8,965,808us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 13,741,649us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage 2.70%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage [1] 4.00%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage [1]
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) (4,775,841)sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) (34.80%)sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease  
Financing Receivable, Recorded Investment, Past Due 22,739,238us-gaap_FinancingReceivableRecordedInvestmentPastDue 22,690,737us-gaap_FinancingReceivableRecordedInvestmentPastDue
Residential Real Estate 1 [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status   3,061,339us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage 0.90%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		 [1] 0.90%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		 [1]
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) (136,184)sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) (4.40%)sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		  
Financing Receivable, Recorded Investment, Past Due 4,437,848us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member		 4,148,638us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Commercial Business [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status   246,977us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage 0.10%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		 [1] 0.10%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		 [1]
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) 41,304sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) 16.70%sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		  
Financing Receivable, Recorded Investment, Past Due 513,015us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember		 509,242us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Commercial Real Estate 1 [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status   9,859,689us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage 1.50%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		 [1] 2.80%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		 [1]
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) (4,740,295)sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) (48.10%)sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		  
Financing Receivable, Recorded Investment, Past Due 15,850,885us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member		 15,499,203us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status   573,644us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage 0.20%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		 [1] 0.20%sfdl_FinancingReceivableRecordedInvestmentNonaccrualStatusPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		 [1]
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) 59,334sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) 10.30%sfdl_FinancingReceivableRecordedInvestmentInNonAccrualStatusPercentIncreaseDecrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		  
Financing Receivable, Recorded Investment, Past Due $ 1,937,490us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember		 $ 2,533,654us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
[1] PERCENT OF TOTAL LOANS HELD FOR INVESTMENT, NET OF DEFERRED FEES AND LOANS IN PROCESS.