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Advances From Federal Home Loan Bank (FHLB) And Other Borrowings (Other Borrowings) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Other Borrowings $ 8,523,348us-gaap_OtherBorrowings $ 8,002,739us-gaap_OtherBorrowings
Financial Instruments, Owned and Pledged as Collateral, at Amortized Cost 17,300,000sfdl_FinancialInstrumentsOwnedAndPledgedAsCollateralAtAmortizedCost 14,800,000sfdl_FinancialInstrumentsOwnedAndPledgedAsCollateralAtAmortizedCost
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 18,000,000us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue 15,400,000us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
Minimum    
Short-term Debt [Line Items]    
Repurchase agreements, maturity term 1 day  
Maximum    
Short-term Debt [Line Items]    
Repurchase agreements, maturity term 3 days  
Securities Sold under Agreements to Repurchase [Member]    
Short-term Debt [Line Items]    
Short-term Debt, Weighted Average Interest Rate 0.15%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
 
Short-term Debt, Maximum Month-end Outstanding Amount $ 10,800,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
$ 9,900,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember