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Premises and Equipment, Net (Future minimum payments under non-cancelable operating leases) (Details) (USD $)
9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
lease_agreement
Dec. 31, 2013
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2013   $ 360,106us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
2014   261,736us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2015   231,332us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears  
2016   128,361us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears  
2017   119,790us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears  
Thereafter   908,408us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter  
Total Future Minimum Payments   2,009,733us-gaap_OperatingLeasesFutureMinimumPaymentsDue  
Total rental expense 306,000us-gaap_OperatingLeasesRentExpenseNet 424,000us-gaap_OperatingLeasesRentExpenseNet 415,000us-gaap_OperatingLeasesRentExpenseNet
Number of operating lease agreements   4sfdl_OperatingLeasesNumberOfLeaseAgreements  
Lease One [Member]      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Monthly rent expense   6,593sfdl_OperatingLeasesRentExpensePerMonth
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= sfdl_LeaseOneMember
 
Operating lease renewal option   30 years  
Lease Two [Member]      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Monthly rent expense   800sfdl_OperatingLeasesRentExpensePerMonth
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= sfdl_LeaseTwoMember
 
Operating lease renewal option   10 years  
Lease Three [Member]      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Monthly rent expense   8,571sfdl_OperatingLeasesRentExpensePerMonth
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= sfdl_LeaseThreeMember
 
Operating lease renewal option   45 years  
Lease Four [Member]      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Monthly rent expense   $ 9,075sfdl_OperatingLeasesRentExpensePerMonth
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= sfdl_LeaseFourMember
 
Operating lease renewal option   20 years