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FHLB Stock (Details) (USD $)
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Federal Home Loan Bank (FHLB) Stock, At Cost $ 3,144,600us-gaap_FederalHomeLoanBankStock   $ 5,016,600us-gaap_FederalHomeLoanBankStock
Federal Home Loan Bank of Atlanta [Member]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Federal Home Loan Bank Stock, Membership Component, Percent of Total Assets 0.15%sfdl_FederalHomeLoanBankStockMembershipComponentPercentOfTotalAssets
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember		 0.15%sfdl_FederalHomeLoanBankStockMembershipComponentPercentOfTotalAssets
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember		 0.15%sfdl_FederalHomeLoanBankStockMembershipComponentPercentOfTotalAssets
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
Federal Home Loan Bank Stock, Transaction Component, % of Outstanding Advances 4.50%sfdl_FederalHomeLoanBankStockTransactionComponentOfOutstandingAdvances
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember		    
Federal Home Loan Bank (FHLB) Stock, At Cost $ 3,100,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember		   $ 5,000,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember