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Related Party Transactions (Details) (USD $)
9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Management [Member]      
Loans and Leases Receivable, Related Parties [Roll Forward]      
Balance, Beginning of Period $ 315,338us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
$ 230,722us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
$ 273,330us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
New Loans 5,364us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
1,116us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
10,956us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
Less Loan Payments 47,372us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
29,641us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
53,564us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
Balance, End of Period 273,330us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
202,197us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
230,722us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
Related Party Deposit Liabilities   15,100,000us-gaap_RelatedPartyDepositLiabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
6,800,000us-gaap_RelatedPartyDepositLiabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ManagementMember
All Employees, Officers and Directors [Member]      
Loans and Leases Receivable, Related Parties [Roll Forward]      
Loans and Leases Receivable, Related Party, Aggregate as Percent of Equity   3.40%sfdl_LoansAndLeasesReceivableRelatedPartyAggregateAsPercentOfEquity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfdl_AllEmployeesOfficersAndDirectorsMember
5.70%sfdl_LoansAndLeasesReceivableRelatedPartyAggregateAsPercentOfEquity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfdl_AllEmployeesOfficersAndDirectorsMember
Director and Officer [Member]      
Loans and Leases Receivable, Related Parties [Roll Forward]      
Related Party Transaction, Expenses from Transactions with Related Party $ 58,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfdl_DirectorAndOfficerMember
$ 81,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfdl_DirectorAndOfficerMember
$ 79,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sfdl_DirectorAndOfficerMember