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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments, Period of Time to Provide Funding 45 days  
Loans and Leases Receivable, Commitments to Purchase or Sell $ 1.9us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell $ 1.2us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
Unused lines of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused Commitments to Extend Credit 44.5us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
30.8us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
Undispursed Loans in Process [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused Commitments to Extend Credit 1.4us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= sfdl_UndispursedLoansInProcessMember
3.5us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= sfdl_UndispursedLoansInProcessMember
Commitments for Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused Commitments to Extend Credit 0.8us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommitmentsForLettersOfCreditMember
2.2us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommitmentsForLettersOfCreditMember
Unused Credit Card Loan Commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused Commitments to Extend Credit 4.4us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= sfdl_UnusedCreditCardLoanCommitmentsMember
4.5us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= sfdl_UnusedCreditCardLoanCommitmentsMember
Commitments to Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused Commitments to Extend Credit $ 0.6us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember