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Disclosures About Offsetting Assets And Liabilities (Financial Liabilities And Derivative Liabilities That Are Subject To Offset) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Disclosures About Offsetting Assets And Liabilities [Abstract]    
Gross amounts of recognized liabilities, Securities lending $ (4,215)us-gaap_SecuritiesLoanedGross [1] $ (40,101)us-gaap_SecuritiesLoanedGross [1]
Gross amounts offset in the Statement of Financial Condition, Securities lending    [1]    [1]
Net amounts presented in the Statement of Financial Condition, Securities lending (4,215)us-gaap_SecuritiesLoaned [1] (40,101)us-gaap_SecuritiesLoaned [1]
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities loaned    [1]    [1]
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending 3,892us-gaap_SecuritiesLoanedFairValueOfCollateral [1] 38,900us-gaap_SecuritiesLoanedFairValueOfCollateral [1]
Securities lending, Net amount (323)sf_SecuritiesLoanedNetAmount [1] (1,201)sf_SecuritiesLoanedNetAmount [1]
Gross amounts of recognized liabilities, Securities purchased under agreements to resell (39,180)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross [2] (263,809)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross [2]
Gross amounts offset in the Statement of Financial Condition, Securities purchased under agreements to resell    [2]    [2]
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreeemnts to resell (39,180)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase [2] (263,809)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase [2]
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell    [2]    [2]
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell 39,089us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral [2] 273,413us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral [2]
Securities purchased under agreements to repurchase, Net amount (91)sf_SecuritiesSoldUnderAgreementsToRepurchaseNetAmount [2] 9,604sf_SecuritiesSoldUnderAgreementsToRepurchaseNetAmount [2]
Gross amount of recognized liabilities, Cash flow interest rate contracts (5,641)us-gaap_DerivativeFairValueOfDerivativeLiability (9,349)us-gaap_DerivativeFairValueOfDerivativeLiability
Gross amounts offset in the Statement of Financial Condition, Cash flow interest rate contracts      
Net amounts presented in the Statement of Financial Condition, Cash flow interest rate contracts (5,641)us-gaap_DerivativeLiabilities (9,349)us-gaap_DerivativeLiabilities
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Cash flow interest rate contracts      
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Cash flow interest rate contracts 5,641us-gaap_DerivativeLiabilityFairValueOfCollateral 9,349us-gaap_DerivativeLiabilityFairValueOfCollateral
Cash flow interest rate contracts, Net amount      
Gross amounts of recognized liabilities (49,036)sf_OffsettingLiabilitiesGrossAmountsOfRecognizedLiabilities (313,259)sf_OffsettingLiabilitiesGrossAmountsOfRecognizedLiabilities
Gross amounts offset in the Statement of Financial Condition      
Net amounts presented in the Statement of Financial Condition (49,036)sf_OffsettingLiabilitiesNetAmountsPresentedInStatementOfFinancialCondition (313,259)sf_OffsettingLiabilitiesNetAmountsPresentedInStatementOfFinancialCondition
Gross amounts not offset in the Statement of Financial Position, Financial instruments      
Gross amounts not offset in the Statement of Financial position, Collateral pledged 48,622sf_OffsettingLiabilitiesCollateralPledged 321,662sf_OffsettingLiabilitiesCollateralPledged
Net amount $ (414)sf_OffsettingLiabilitiesNetAmount $ 8,403sf_OffsettingLiabilitiesNetAmount
[1] Securities lending transactions are included in payables to from brokers, dealers, and clearing organizations on the consolidated statements of financial condition. See Note 5 in the notes to consolidated financial statements for additional information on payables to brokers, dealers, and clearing organizations.(4)
[2] Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default.