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Advances From Federal Home Loan Bank (FHLB) And Other Borrowings (Advances from the FHLB summarized by year of maturity and weighted average interest rate) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
Due in Next Twelve Months $ 15,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate  
Due in Year Two 20,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate  
Due in Year Three 12,900,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate  
Due in Year Four 5,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate  
Federal Home Loan Bank, Advances 52,900,000us-gaap_AdvancesFromFederalHomeLoanBanks 87,740,058us-gaap_AdvancesFromFederalHomeLoanBanks
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]    
Weighted Rate of Amounts Due within One Year of Balance Sheet Date 2.61%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate  
Weighted Rate, One to Two Years from Balance Sheet Date 4.61%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate  
Weighted Rate, Two to Three Years from Balance Sheet Date 4.38%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate  
Weighted Rate, Three to Four Years from Balance Sheet Date 3.39%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate  
Federal Home Loan Bank, Advances, Weighted Rate 3.87%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures [Abstract]    
Federal Home Loan Bank, Advances, Collateral Pledged, Amortized Cost 99,900,000sfdl_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledgedAmortizedCost 111,600,000sfdl_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledgedAmortizedCost
Federal Home Loan Bank, Advances, Collateral Pledged, Fair Value $ 99,300,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 $ 102,700,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1