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Loans Receivable, Net (Schedule of Allowance for Loan Losses) (Details) (USD $)
9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance $ 14,615,198us-gaap_AllowanceForDoubtfulAccountsReceivable $ 10,241,970us-gaap_AllowanceForDoubtfulAccountsReceivable $ 11,318,371us-gaap_AllowanceForDoubtfulAccountsReceivable
Provision For Loan Losses 1,975,000us-gaap_ProvisionForDoubtfulAccounts 450,000us-gaap_ProvisionForDoubtfulAccounts 2,645,381us-gaap_ProvisionForDoubtfulAccounts
Charge-Offs (7,422,393)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (3,114,833)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (5,209,830)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Recoveries 2,150,566us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 780,359us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 1,488,048us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Ending Balance 11,318,371us-gaap_AllowanceForDoubtfulAccountsReceivable 8,357,496us-gaap_AllowanceForDoubtfulAccountsReceivable 10,241,970us-gaap_AllowanceForDoubtfulAccountsReceivable
Residential Real Estate      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 1,928,625us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
1,706,643us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
1,521,559us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
Provision For Loan Losses 183,236us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
(91,991)us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
1,030,237us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
Charge-Offs (647,161)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
(359,021)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
(1,118,168)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
Recoveries 56,859us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
136,434us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
273,015us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
Ending Balance 1,521,559us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
1,392,065us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
1,706,643us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ResidentialRealEstate1Member
Consumer      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 1,498,111us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
847,777us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
1,001,271us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
Provision For Loan Losses (227,872)us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
352,305us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
(5,306)us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
Charge-Offs (286,612)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
(372,460)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
(207,230)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
Recoveries 17,644us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
59,094us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
59,042us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
Ending Balance 1,001,271us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
886,716us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
847,777us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_ConsumerMember
Commercial Business      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 644,855us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
426,658us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
618,919us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
Provision For Loan Losses 175,141us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
(53,435)us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
(187,377)us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
Charge-Offs (209,898)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
(328,094)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
(31,831)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
Recoveries 8,821us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
114,224us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
26,947us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
Ending Balance 618,919us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
159,353us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
426,658us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialBusinessMember
Commercial Real Estate      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance 10,543,607us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
7,260,892us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
8,176,622us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
Provision For Loan Losses 1,844,495us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
243,121us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
1,807,827us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
Charge-Offs (6,278,722)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
(2,055,258)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
(3,852,601)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
Recoveries 2,067,242us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
470,607us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
1,129,044us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
Ending Balance $ 8,176,622us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
$ 5,919,362us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member
$ 7,260,892us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancialInstrumentAxis
= sfdl_CommercialRealEstate1Member