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Stock Issuance and Exchange (Details) (USD $)
0 Months Ended 3 Months Ended
Jul. 31, 2013
Sep. 29, 2010
Dec. 22, 2010
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]            
Stock Issuance, Value   $ 8,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues        
Common Stock Par Value Per Share         $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Payments for Repurchase of Warrants 50,000us-gaap_PaymentsForRepurchaseOfWarrants          
Warrant Issued In Conjunction With Serial Preferred Stock 400,000us-gaap_WarrantsAndRightsOutstanding          
Adjustments to Additional Paid in Capital, Warrant Repurchased 350,000sfdl_AdjustmentstoAdditionalPaidinCapitalWarrantRepurchased          
Series A Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Liquidation Preference, Value   18,000,000us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Series B Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Liquidation Preference, Value   18,000,000us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Proceeds from Issuance of Preferred Stock and Preference Stock   4,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Stock Issuance, Value   4,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Common Stock | Private Placement [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, New Issues     82,906us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ sfdl_SaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Shares Issued, Price Per Share     $ 10.00us-gaap_SharesIssuedPricePerShare
/ sfdl_SaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Proceeds from Issuance of Private Placement     829,060us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ sfdl_SaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Common Stock Par Value Per Share     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ sfdl_SaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Management [Member] | Common Stock | Private Placement [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, New Issues   400,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
/ sfdl_SaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Shares Issued, Price Per Share   $ 10.00us-gaap_SharesIssuedPricePerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
/ sfdl_SaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Proceeds from Issuance of Private Placement   $ 4,000,000.0us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
/ sfdl_SaleOfStockAxis
= us-gaap_PrivatePlacementMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Prior to February 15, 2014 [Member] | Series A Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Dividend Rate, Percentage       5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_VariableRateAxis
= sfdl_PriorToFebruary152014Member
   
After February 15, 2014 [Member] | Series A Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Dividend Rate, Percentage       9.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_VariableRateAxis
= sfdl_AfterFebruary152014Member
   
During First Eight Years from Date of Issuance [Member] | Series B Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Dividend Rate, Percentage       2.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_VariableRateAxis
= sfdl_DuringFirstEightYearsFromDateOfIssuanceMember
   
After First Eight Years from Date of Issuance [Member] | Series B Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Dividend Rate, Percentage       9.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_VariableRateAxis
= sfdl_AfterFirstEightYearsFromDateOfIssuanceMember
   
Ineligible as CDFI for 180 Days [Member] | Series B Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Dividend Rate, Percentage       5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_VariableRateAxis
= sfdl_IneligibleAsCdfiFor180DaysMember
   
Ineligible as CDFI for 270 Days [Member] | Series B Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Dividend Rate, Percentage       9.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_VariableRateAxis
= sfdl_IneligibleAsCdfiFor270DaysMember