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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
security
Dec. 31, 2013
Dec. 31, 2012
Available-For-Sale And Held-To-Maturity Securities [Abstract]      
Available for sale mortgage backed securities transferred to held to maturity $ 1,100,000,000sf_AvailableForSaleMortgageBackedSecuritiesTransferredToHeldToMaturity    
Held to maturity mortgage backed securities transferred to available for sale 387,500,000sf_HeldToMaturityMortgageBackedSecuritiesTransferredToAvailableForSale    
Proceeds from sale of available-for-sale securities 300,300,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 197,500,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 250,200,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Realized gains resulting from sale of available-for-sale securities 3,700,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 2,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 3,800,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Unrealized gains (losses) recorded in accumulated other comprehensive income 1,838,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1],[2] (48,528,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1],[2] 8,684,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1],[2]
Securities pledged as collateral 1,200,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue 505,500,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue  
Gross unrealized losses on available for sale securities 14,172,000sf_AvailableForSaleSecuritiesUnrealizedLoss [3] 20,285,000sf_AvailableForSaleSecuritiesUnrealizedLoss [3]  
Number of available for sale securities whose amortized costs exceeded their fair values 100us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1    
Loss on available-for-sale securities in a loss position for 12 months or longer 9,336,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses    
Available-for-sale securities, percentage of investment portfolio 58.30%sf_PercentageOfAvailableForSaleInvestmentPortfolio    
Number of held to maturity securities in a loss position 22us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions    
Held to maturity securities whose carrying value exceeded fair value 3,900,000sf_HeldToMaturitySecuritiesWhoseCarryingValueExceededFairValue    
Held to maturity securities whose carrying value exceeded fair value for 12 months or more 3,600,000sf_HeldToMaturitySecuritiesWhoseCarryingValueExceededFairValueFor12MonthsOrMore    
Amortized cost basis 1,520,517,000us-gaap_AvailableForSaleSecuritiesAmortizedCost 1,762,516,000us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Certain available-for-sale investments reported in the statements of financial condition at an amount less than their amortized cost 881,774,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue    
Credit-related other-than-temporary impairment     $ 600,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsPeriodIncreaseDecrease
[1] Net of taxes of $1.1 million, $32.4 million, and $5.8 million for the years ended December 31, 2014, 2013, and 2012, respectively.
[2] Amounts are net of reclassifications to earnings of realized gains of $2.3 million, $1.2 million, and $2.4 million for the years ended December 31, 2014, 2013, and 2012, respectively.
[3] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.