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Advances From Federal Home Loan Bank (FHLB) And Other Borrowings (Callable FHLB advances) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Federal Home Loan Bank Advances [Line Items]    
Advances From FHLB $ 52,900,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 87,740,058us-gaap_AdvancesFromFederalHomeLoanBanks
Amount of Additional Borrowing Capacity 195,700,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds 167,900,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
Federal Home Loan Bank Advances November 23, 2005 [Member]    
Schedule of Federal Home Loan Bank Advances [Line Items]    
Advances From FHLB 5,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesNovember232005Member
 
Advances from FHLB, Interest Rate at Period End 3.933%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesNovember232005Member
 
Federal Home Loan Bank Advances July 11, 2006 [Member]    
Schedule of Federal Home Loan Bank Advances [Line Items]    
Advances From FHLB 5,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesJuly112006Member
 
Advances from FHLB, Interest Rate at Period End 4.80%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesJuly112006Member
 
Federal Home Loan Bank Advances November 29, 2006 [Member]    
Schedule of Federal Home Loan Bank Advances [Line Items]    
Advances From FHLB 5,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesNovember292006Member
 
Advances from FHLB, Interest Rate at Period End 4.025%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesNovember292006Member
 
Federal Home Loan Bank Advances May 24, 2007 [Member]    
Schedule of Federal Home Loan Bank Advances [Line Items]    
Advances From FHLB 7,900,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesMay242007Member
 
Advances from FHLB, Interest Rate at Period End 4.375%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesMay242007Member
 
Federal Home Loan Bank Advances July 25, 2007 [Member]    
Schedule of Federal Home Loan Bank Advances [Line Items]    
Advances From FHLB $ 5,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesJuly252007Member
 
Advances from FHLB, Interest Rate at Period End 4.396%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ sfdl_FederalHomeLoanBankAdvancesBorrowDateAxis
= sfdl_FederalHomeLoanBankAdvancesJuly252007Member