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Bank Loans (Schedule Of Balance And Associated Percentage Of Each Major Loan Category In Loan Portfolio) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross Carrying Amount, Total $ 2,116,634,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 1,463,707,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Loans and Leases Receivable, Gross Carrying Amount, Total 100.00%sf_LoansAndLeasesReceivableGrossCarringAmountTotal 100.00%sf_LoansAndLeasesReceivableGrossCarringAmountTotal    
Unamortized loan discount (30,533,000)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums (45,100,000)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums    
Unamortized loan fees, net of origination costs (1,631,000)us-gaap_LoansAndLeasesReceivableDeferredIncome (1,920,000)us-gaap_LoansAndLeasesReceivableDeferredIncome    
Loans in process 1,681,000us-gaap_LoansAndLeasesReceivableLoansInProcess 334,000us-gaap_LoansAndLeasesReceivableLoansInProcess    
Allowance for loan losses (20,731,000)us-gaap_LoansAndLeasesReceivableAllowance (12,668,000)us-gaap_LoansAndLeasesReceivableAllowance (8,145,000)us-gaap_LoansAndLeasesReceivableAllowance (5,300,000)us-gaap_LoansAndLeasesReceivableAllowance
Loans and leases receivable, net reported amount 2,065,420,000us-gaap_LoansAndLeasesReceivableNetReportedAmount 1,404,353,000us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Securities-based loans 732,800,000sf_SecuritiesBasedLoansCarryingValue 508,900,000sf_SecuritiesBasedLoansCarryingValue    
Commercial And Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross Carrying Amount, Commercial and Industrial 896,853,000sf_LoansAndLeasesReceivableGrossCarryingAmountCommercialAndIndustrial
/ us-gaap_FinancialInstrumentAxis
= sf_CommercialAndIndustrialMember
509,484,000sf_LoansAndLeasesReceivableGrossCarryingAmountCommercialAndIndustrial
/ us-gaap_FinancialInstrumentAxis
= sf_CommercialAndIndustrialMember
   
Loans and Leases Receivable, Gross Carrying Amount, Commercial and Industrial, Percentage of Total 42.40%sf_LoansAndLeasesReceivableGrossCarryingAmountCommercialAndIndustrialPercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= sf_CommercialAndIndustrialMember
34.80%sf_LoansAndLeasesReceivableGrossCarryingAmountCommercialAndIndustrialPercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= sf_CommercialAndIndustrialMember
   
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross Carrying Amount, Consumer 758,288,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
552,333,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
   
Loans and Leases Receivable, Gross Carrying Amount, Consumer, Percentage of Total 35.80%sf_LoansAndLeasesReceivableGrossCarryingAmountConsumerPercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
37.70%sf_LoansAndLeasesReceivableGrossCarryingAmountConsumerPercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
   
Residential Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross Carrying Amount, Residential Real Estate 432,646,000sf_LoansAndLeasesReceivableGrossCarryingAmountResidentialRealEstate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialRealEstateMember
372,789,000sf_LoansAndLeasesReceivableGrossCarryingAmountResidentialRealEstate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialRealEstateMember
   
Loans and Leases Receivable, Gross Carrying Amount, Residential Real Estate, Percentage of Total 20.40%sf_LoansAndLeasesReceivableGrossCarryingAmountResidentialRealEstatePercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialRealEstateMember
25.50%sf_LoansAndLeasesReceivableGrossCarryingAmountResidentialRealEstatePercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialRealEstateMember
   
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross Carrying Amount, Commercial Real Estate 15,902,000sf_LoansAndLeasesReceivableGrossCarryingAmountCommercialRealEstate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
12,284,000sf_LoansAndLeasesReceivableGrossCarryingAmountCommercialRealEstate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
   
Loans and Lease Receivable, Gross Carrying Amount, Commercial Real Estate Percentage Of Total 0.80%sf_LoansAndLeasesReceivableGrossCarryingAmountCommercialRealEstatePercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
0.80%sf_LoansAndLeasesReceivableGrossCarryingAmountCommercialRealEstatePercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
   
Home Equity Lines Of Credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross Carrying Amount, Home Equity Lines of Credit 12,945,000sf_LoansAndLeasesReceivableGrossCarryingAmountHomeEquityLinesOfCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
16,327,000sf_LoansAndLeasesReceivableGrossCarryingAmountHomeEquityLinesOfCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
   
Loans and Leases Receivable, Gross Carrying Amount, Home Equity Lines of Credit, Percentage of Total 0.60%sf_LoansAndLeasesReceivableGrossCarryingAmountHomeEquityLinesOfCreditPercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
1.10%sf_LoansAndLeasesReceivableGrossCarryingAmountHomeEquityLinesOfCreditPercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
   
Construction And Land [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Gross Carrying Amount, Construction and Land   $ 490,000sf_LoansAndLeasesReceivableGrossCarryingAmountConstructionAndLand
/ us-gaap_FinancialInstrumentAxis
= sf_ConstructionAndLandMember
   
Loans and Leases Receivable, Gross Carrying Amount, Construction and Land, Percentage of Total   0.10%sf_LoansAndLeasesReceivableGrossCarryingAmountConstructionAndLandPercentageOfTotal
/ us-gaap_FinancialInstrumentAxis
= sf_ConstructionAndLandMember