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Loans Receivable, Net (Past Due Financing Receivables) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 6,576,081us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue $ 6,713,137us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
60-89 Days Past Due 2,373,007us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue 3,644,676us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
90 Days or More Past Due 13,741,649us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue 10,012,397us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Total Past Due 22,690,737us-gaap_FinancingReceivableRecordedInvestmentPastDue 20,370,210us-gaap_FinancingReceivableRecordedInvestmentPastDue
Current 325,077,980us-gaap_FinancingReceivableRecordedInvestmentCurrent 351,014,826us-gaap_FinancingReceivableRecordedInvestmentCurrent
Total 347,768,717us-gaap_NotesReceivableGross 371,385,036us-gaap_NotesReceivableGross
Residential Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
0us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
60-89 Days Past Due 1,087,299us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
1,363,132us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
90 Days or More Past Due 3,061,339us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
4,607,613us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Total Past Due 4,148,638us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
5,970,745us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Current 73,134,179us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
77,033,737us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Total 77,282,817us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
83,004,482us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ResidentialRealEstate1Member
Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 1,868,787us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
1,494,429us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
60-89 Days Past Due 91,223us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
234,878us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
90 Days or More Past Due 573,644us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
399,062us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Total Past Due 2,533,654us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
2,128,369us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Current 47,857,570us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
50,077,532us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Total 50,391,224us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
52,205,901us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_ConsumerMember
Commercial Business    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 162,481us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
115,186us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
60-89 Days Past Due 99,784us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
0us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
90 Days or More Past Due 246,977us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
33,055us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Total Past Due 509,242us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
148,241us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Current 10,055,225us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
7,626,857us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Total 10,564,467us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
7,775,098us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialBusinessMember
Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 4,544,813us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
5,103,522us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
60-89 Days Past Due 1,094,701us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
2,046,666us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
90 Days or More Past Due 9,859,689us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
4,972,667us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Total Past Due 15,499,203us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
12,122,855us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Current 194,031,006us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
216,276,700us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
Total $ 209,530,209us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member
$ 228,399,555us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sfdl_CommercialRealEstate1Member