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Loans Receivable, Net (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
loan
Mar. 31, 2015
payments
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Nonperforming Loans, Accrual Status, Minimum Consecutive Payments 90sfdl_NonperformingLoansAccrualStatusMinimumConsecutivePayments 6sfdl_NonperformingLoansAccrualStatusMinimumConsecutivePayments  
TDRs included in impaired loans $ 8,900,000.0sfdl_TdrsIncludedInImpairedLoans $ 8,900,000.0sfdl_TdrsIncludedInImpairedLoans $ 9,600,000.0sfdl_TdrsIncludedInImpairedLoans
Financing Receivable, Modifications, Subsequent Default, Aggregate Number of Contracts 2sfdl_FinancingReceivableModificationsSubsequentDefaultAggregateNumberOfContracts 2sfdl_FinancingReceivableModificationsSubsequentDefaultAggregateNumberOfContracts  
Impaired Financing Receivables, Loans Defaulted   293,000sfdl_ImpairedFinancingReceivablesLoansDefaulted  
Days Past Due to Be Considered In Default 30sfdl_DaysPastDuetoBeConsideredInDefault 30sfdl_DaysPastDuetoBeConsideredInDefault  
Review period to request a new third party appraisal 24 months 24 months  
Impaired Financing Receivable, Recorded Investment $ 15,698,201us-gaap_ImpairedFinancingReceivableRecordedInvestment $ 15,698,201us-gaap_ImpairedFinancingReceivableRecordedInvestment $ 20,247,955us-gaap_ImpairedFinancingReceivableRecordedInvestment