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Acquisitions (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Feb. 15, 2013
Dec. 31, 2014
Dec. 31, 2013
Nov. 07, 2014
Jul. 31, 2014
Nov. 01, 2011
Apr. 03, 2014
Oct. 31, 2013
Nov. 30, 2014
Nov. 30, 2013
Business Acquisition [Line Items]                    
Goodwill   $ 795,026,000us-gaap_Goodwill $ 727,336,000us-gaap_Goodwill              
Bargain purchase gain     7,566,000us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount              
Stock consideration, common stock 0.2143sf_BusinessAcquisitionAcquireeOustandingStockRightToReceiveAcquirerCommonStock                  
Goodwill recorded in business combination   67,690,000us-gaap_GoodwillAcquiredDuringPeriod                
Merchant Capital LLC [Member]                    
Business Acquisition [Line Items]                    
Goodwill   15,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sf_MerchantCapitalLLCMember
               
1919 Investment Counsel And Trust Company NA [Member]                    
Business Acquisition [Line Items]                    
Goodwill       13,800,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sf_NineteenNineteenInvestmentCounselAndTrustCompanyNaMember
           
Fair value of awards issued as retention       11,200,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
/ us-gaap_BusinessAcquisitionAxis
= sf_NineteenNineteenInvestmentCounselAndTrustCompanyNaMember
           
1919 Investment Counsel And Trust Company NA [Member] | Customer Relationships [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets       6,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_NineteenNineteenInvestmentCounselAndTrustCompanyNaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
           
Oriel Securities [Member]                    
Business Acquisition [Line Items]                    
Goodwill         18,700,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sf_OrielSecuritiesMember
         
Fair value of awards issued as retention         6,800,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
/ us-gaap_BusinessAcquisitionAxis
= sf_OrielSecuritiesMember
         
Oriel Securities [Member] | Trade Names [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets         1,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_OrielSecuritiesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
         
Oriel Securities [Member] | Non-Compete Agreements [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets         1,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_OrielSecuritiesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
         
De La Rosa & Co. [Member]                    
Business Acquisition [Line Items]                    
Goodwill             17,400,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sf_DeLaRosaAndCompanyMember
     
De La Rosa & Co. [Member] | Customer Relationships [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets             200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_DeLaRosaAndCompanyMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
De La Rosa & Co. [Member] | Trade Names [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets             1,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_DeLaRosaAndCompanyMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
     
Acacia Federal Savings Bank [Member]                    
Business Acquisition [Line Items]                    
Loans acquired in acquisition               337,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= sf_AcaciaFederalSavingsBankMember
   
Other assets acquired               180,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= sf_AcaciaFederalSavingsBankMember
   
Deposits assumed               435,400,000sf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities
/ us-gaap_BusinessAcquisitionAxis
= sf_AcaciaFederalSavingsBankMember
   
Other liabilities assumed               10,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= sf_AcaciaFederalSavingsBankMember
   
Bargain purchase gain     7,600,000us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= sf_AcaciaFederalSavingsBankMember
             
Ziegler Lotsoff Capital Management, LLC [Member]                    
Business Acquisition [Line Items]                    
Goodwill                 6,800,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sf_ZieglerLotsoffCapitalManagementLlcMember
 
Ziegler Lotsoff Capital Management, LLC [Member] | Customer Relationships [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets                   3,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_ZieglerLotsoffCapitalManagementLlcMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Ziegler Lotsoff Capital Management, LLC [Member] | Trade Names [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets                   100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_ZieglerLotsoffCapitalManagementLlcMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
KBW [Member]                    
Business Acquisition [Line Items]                    
Goodwill 288,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
                 
Fair value of awards issued as retention 30,600,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
                 
Cash consideration per share 8.00sf_BusinessAcquisitionAcquireeOustandingStockRightToReceiveCashConsiderationPerShare
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
                 
Cash consideration per share before extraordinary dividend amount 10.00sf_BusinessAcquisitionAcquireeOustandingStockRightToReceiveCashConsiderationPerShareBeforeExtraordinaryDividendAmount
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
                 
Extraordinary dividend 2.00sf_BusinessAcquisitionAcquireeOustandingStockRightToReceiveCashConsiderationPerShareExtraordinaryDividend
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
                 
Expected cash consideration 253,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
                 
Transaction costs 9,800,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
                 
Fair value of awards issued as retention   30,600,000sf_RestrictedStockOrUnitExpense
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
               
KBW [Member] | Customer Relationships [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets 11,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
                 
KBW [Member] | Trade Names [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets 9,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
                 
KBW [Member] | Investment Banking Backlog [Member]                    
Business Acquisition [Line Items]                    
Identifiable intangible assets 4,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sf_InvestmentBankingBacklogMember
                 
KBW [Member] | Common Stock [Member]                    
Business Acquisition [Line Items]                    
Stock issued in conjunction with merger 6.7us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_CommonStockMember
                 
KBW [Member] | Restricted Stock [Member]                    
Business Acquisition [Line Items]                    
Stock issued in conjunction with merger 2.2us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_BusinessAcquisitionAxis
= sf_KbwMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_RestrictedStockMember
                 
Stone & Youngberg LLC [Member]                    
Business Acquisition [Line Items]                    
Consideration to be paid in installments           24,000,000sf_BusinessCombinationConsiderationToBePaidInInstallments
/ us-gaap_BusinessAcquisitionAxis
= sf_StoneYoungbergLlcMember
       
Number of years in installment plan           3 years        
Period of contingent consideration           5 years        
Maximum earn-out           25,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= sf_StoneYoungbergLlcMember
       
Liability for earn-out payments and installment payments   $ 8,000,000sf_BusinessCombinationLiabilityForInstallmentPaymentsAndContingentConsideration
/ us-gaap_BusinessAcquisitionAxis
= sf_StoneYoungbergLlcMember
$ 16,800,000sf_BusinessCombinationLiabilityForInstallmentPaymentsAndContingentConsideration
/ us-gaap_BusinessAcquisitionAxis
= sf_StoneYoungbergLlcMember