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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of The Available For Sale Securities And Held To Maturity Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized cost $ 1,520,517us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 1,762,516us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for sale securities, unrealized gains 7,133sf_AvailableForSaleSecuritiesUnrealizedGains [1] 14,022sf_AvailableForSaleSecuritiesUnrealizedGains [1]
Available-for-sale Securities, Gross unrealized losses (14,172)sf_AvailableForSaleSecuritiesUnrealizedLoss [1] (20,285)sf_AvailableForSaleSecuritiesUnrealizedLoss [1]
Available-for-sale securities, Estimated fair value 1,513,478us-gaap_AvailableForSaleSecurities 1,756,253us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities, Amortized cost 1,177,565us-gaap_HeldToMaturitySecurities 1,312,115us-gaap_HeldToMaturitySecurities
Held-to-maturity Securities, Gross unrealized gains 38,338sf_HeldToMaturitySecuritiesUnrealizedGains [1] 7,324sf_HeldToMaturitySecuritiesUnrealizedGains [1]
Held-to-maturity Securities, Gross unrealized losses (3,927)sf_HeldToMaturitySecuritiesUnrealizedLosses [1] (13,480)sf_HeldToMaturitySecuritiesUnrealizedLosses [1]
Held-to-maturity securities, Estimated fair value 1,211,976us-gaap_HeldToMaturitySecuritiesFairValue 1,305,959us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized cost 1,613us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 1,074us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Available for sale securities, unrealized gains 1sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 [1]  
Available-for-sale Securities, Gross unrealized losses (4)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 [1] (2)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 [1]
Available-for-sale securities, Estimated fair value 1,610us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 1,072us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
State And Municipal Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized cost 76,518us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 96,475us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available for sale securities, unrealized gains 20sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 [1] 739sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 [1]
Available-for-sale Securities, Gross unrealized losses (2,137)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 [1] (6,537)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 [1]
Available-for-sale securities, Estimated fair value 74,401us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 90,677us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Mortgage-backed Securities: Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized cost 206,982us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 184,533us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
Available for sale securities, unrealized gains 3,137sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 [1] 2,859sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 [1]
Available-for-sale Securities, Gross unrealized losses (913)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 [1] (3,405)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 [1]
Available-for-sale securities, Estimated fair value 209,206us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 183,987us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
Held-to-maturity Securities, Amortized cost 884,451us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 968,759us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
Held-to-maturity Securities, Gross unrealized gains 32,926sf_HeldToMaturitySecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 [1] 1,156sf_HeldToMaturitySecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 [1]
Held-to-maturity Securities, Gross unrealized losses (42)sf_HeldToMaturitySecuritiesUnrealizedLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 [1] (7,915)sf_HeldToMaturitySecuritiesUnrealizedLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 [1]
Held-to-maturity securities, Estimated fair value 917,335us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember		 962,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AgencySecuritiesMember
Commercial [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized cost 107,100us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 209,949us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Available for sale securities, unrealized gains 633sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [1] 3,084sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [1]
Available-for-sale Securities, Gross unrealized losses (89)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [1] (1,787)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [1]
Available-for-sale securities, Estimated fair value 107,644us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 211,246us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Held-to-maturity Securities, Amortized cost 59,462us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 59,404us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Held-to-maturity Securities, Gross unrealized gains 2,257sf_HeldToMaturitySecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [1]  
Held-to-maturity Securities, Gross unrealized losses    [1] (186)sf_HeldToMaturitySecuritiesUnrealizedLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [1]
Held-to-maturity securities, Estimated fair value 61,719us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 59,218us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Non-Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized cost 3,186us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember		 4,547us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember
Available for sale securities, unrealized gains 5sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember		 [1] 72sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember		 [1]
Available-for-sale Securities, Gross unrealized losses (54)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember		 [1]  
Available-for-sale securities, Estimated fair value 3,137us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember		 4,619us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember
Held-to-maturity Securities, Amortized cost 1,081us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember		  
Held-to-maturity Securities, Gross unrealized gains    [1]  
Held-to-maturity Securities, Gross unrealized losses (17)sf_HeldToMaturitySecuritiesUnrealizedLosses
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember		 [1]  
Held-to-maturity securities, Estimated fair value 1,064us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= sf_NonAgencyMortgageBackedSecuritiesMember		  
Corporate Fixed Income Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized cost 336,210us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 496,385us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
Available for sale securities, unrealized gains 2,016sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [1] 4,769sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [1]
Available-for-sale Securities, Gross unrealized losses (820)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [1] (2,838)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [1]
Available-for-sale securities, Estimated fair value 337,406us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 498,316us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
Held-to-maturity Securities, Amortized cost 55,236us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 55,329us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
Held-to-maturity Securities, Gross unrealized gains   11sf_HeldToMaturitySecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [1]
Held-to-maturity Securities, Gross unrealized losses   (2,605)sf_HeldToMaturitySecuritiesUnrealizedLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 [1]
Held-to-maturity securities, Estimated fair value   52,735us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized cost 788,908us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 769,553us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Available for sale securities, unrealized gains 1,321sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 [1] 2,499sf_AvailableForSaleSecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 [1]
Available-for-sale Securities, Gross unrealized losses (10,155)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 [1] (5,716)sf_AvailableForSaleSecuritiesUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 [1]
Available-for-sale securities, Estimated fair value 780,074us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 766,336us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Held-to-maturity Securities, Amortized cost 177,335us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 228,623us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Held-to-maturity Securities, Gross unrealized gains 3,151sf_HeldToMaturitySecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 [1] 6,157sf_HeldToMaturitySecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 [1]
Held-to-maturity Securities, Gross unrealized losses (2,645)sf_HeldToMaturitySecuritiesUnrealizedLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 [1] (2,774)sf_HeldToMaturitySecuritiesUnrealizedLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 [1]
Held-to-maturity securities, Estimated fair value 177,841us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 232,006us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember
Municipal Auction Rate Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Held-to-maturity Securities, Amortized cost 55,236us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByAssetClassAxis
= sf_AuctionRateMunicipalSecuritiesMember		  
Held-to-maturity Securities, Gross unrealized gains 4sf_HeldToMaturitySecuritiesUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= sf_AuctionRateMunicipalSecuritiesMember		 [1]  
Held-to-maturity Securities, Gross unrealized losses (1,223)sf_HeldToMaturitySecuritiesUnrealizedLosses
/ us-gaap_FairValueByAssetClassAxis
= sf_AuctionRateMunicipalSecuritiesMember		 [1]  
Held-to-maturity securities, Estimated fair value $ 54,017us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= sf_AuctionRateMunicipalSecuritiesMember		  
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.