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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 78,768us-gaap_NetIncomeLoss	$ 78,893us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,566wfsl_AmortizationAccretionOfFeesDiscountsPremiumsAndIntangibleAssetsNet	5,993wfsl_AmortizationAccretionOfFeesDiscountsPremiumsAndIntangibleAssetsNet
Cash received from (paid to) FDIC under loss share	(738)wfsl_IncreaseDecreaseInFdicIndemnificationAsset	1,629wfsl_IncreaseDecreaseInFdicIndemnificationAsset
Stock option compensation expense	600us-gaap_StockOptionPlanExpense	600us-gaap_StockOptionPlanExpense
Reversal of provision for loan losses	(9,449)us-gaap_ProvisionForLoanAndLeaseLosses	(8,936)us-gaap_ProvisionForLoanAndLeaseLosses
Gain on real estate held for sale	(12,338)wfsl_GainLossonRealEstateHeldforsale	(1,042)wfsl_GainLossonRealEstateHeldforsale
Decrease (increase) in accrued interest receivable	11,678us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet	(2,066)us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet
Increase in FDIC loss share receivable	1,795wfsl_IncreaseDecreaseInFdicLossShareReceivable	(1,896)wfsl_IncreaseDecreaseInFdicLossShareReceivable
Decrease in federal and state income tax	6,995us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	5,043us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Increase in cash surrender value in bank owned life insurance	(961)us-gaap_BankOwnedLifeInsuranceIncome	0us-gaap_BankOwnedLifeInsuranceIncome
Decrease (increase) in other assets	(28,462)us-gaap_IncreaseDecreaseInOtherOperatingAssets	6,113us-gaap_IncreaseDecreaseInOtherOperatingAssets
Increase (decrease) in accrued expenses and other liabilities	586us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	(7,753)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Net cash provided by operating activities	59,040us-gaap_NetCashProvidedByUsedInOperatingActivities	76,578us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES
Net loan originations	(78,301)wfsl_LoansOriginatedNetOfPrincipalCollections	(127,918)wfsl_LoansOriginatedNetOfPrincipalCollections
Loans purchased	(146,832)us-gaap_PaymentsToAcquireLoansHeldForInvestment	0us-gaap_PaymentsToAcquireLoansHeldForInvestment
FHLB & FRB stock redemption	7,921us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock	5,682us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock
Available-for-sale securities purchased	(163,126)us-gaap_PaymentsToAcquireAvailableForSaleSecurities	(930,476)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Principal payments and maturities of available-for-sale securities	466,991us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	185,050us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Principal payments and maturities of held-to-maturity securities	65,913us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	42,253us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
Net cash received from acquisitions	0us-gaap_CashAcquiredFromAcquisition	1,254,517us-gaap_CashAcquiredFromAcquisition
Proceeds from sales of real estate owned and held for investment	28,354us-gaap_ProceedsFromSaleOfPropertyHeldForSale	28,489us-gaap_ProceedsFromSaleOfPropertyHeldForSale
Proceeds from sales of covered REO	9,050wfsl_ProceedsFromSalesOfCoveredRealEstateOwned	17,216wfsl_ProceedsFromSalesOfCoveredRealEstateOwned
Purchase of bank owned life insurance	(100,000)us-gaap_PaymentsToAcquireLifeInsurancePolicies	0us-gaap_PaymentsToAcquireLifeInsurancePolicies
Premises and equipment purchased and REO improvements	(16,897)wfsl_PremisesAndEquipmentPurchasedAndReoImprovements	(19,659)wfsl_PremisesAndEquipmentPurchasedAndReoImprovements
Net cash provided by investing activities	73,073us-gaap_NetCashProvidedByUsedInInvestingActivities	455,154us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES
Net decrease in customer accounts	(24,227)us-gaap_IncreaseDecreaseInDeposits	(59,630)us-gaap_IncreaseDecreaseInDeposits
Repayments of borrowings	(100,000)us-gaap_RepaymentsOfDebt	0us-gaap_RepaymentsOfDebt
Proceeds from exercise of common stock options and related tax benefit	492us-gaap_ProceedsFromStockOptionsExercised	9,911us-gaap_ProceedsFromStockOptionsExercised
Dividends paid on common stock	(26,806)us-gaap_PaymentsOfDividendsCommonStock	(20,372)us-gaap_PaymentsOfDividendsCommonStock
Treasury stock purchased	(77,355)us-gaap_PaymentsForRepurchaseOfCommonStock	(31,776)us-gaap_PaymentsForRepurchaseOfCommonStock
Decrease in advance payments by borrowers for taxes and insurance	(10,996)us-gaap_IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	(25,192)us-gaap_IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance
Net cash used in financing activities	(238,892)us-gaap_NetCashProvidedByUsedInFinancingActivities	(127,059)us-gaap_NetCashProvidedByUsedInFinancingActivities
Increase (decrease) in cash and cash equivalents	(106,779)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	404,673us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period	781,843us-gaap_CashAndCashEquivalentsAtCarryingValue	203,563us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period	675,064us-gaap_CashAndCashEquivalentsAtCarryingValue	608,236us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-cash investing activities
Non-covered real estate acquired through foreclosure	18,991wfsl_NonCoveredRealEstateAcquiredThroughForeclosure	20,898wfsl_NonCoveredRealEstateAcquiredThroughForeclosure
Covered real estate acquired through foreclosure	936wfsl_CoveredRealEstateAcquiredThroughForeclosure	836wfsl_CoveredRealEstateAcquiredThroughForeclosure
Cash paid during the period for
Interest	62,193us-gaap_InterestPaid	65,499us-gaap_InterestPaid
Income taxes	32,517us-gaap_IncomeTaxesPaid	37,572us-gaap_IncomeTaxesPaid
The following summarizes the non-cash activities related to acquisitions
Fair value of assets and intangibles acquired, including goodwill	0us-gaap_FairValueOfAssetsAcquired	63,111us-gaap_FairValueOfAssetsAcquired
Fair value of liabilities assumed	0us-gaap_LiabilitiesAssumed1	(1,317,628)us-gaap_LiabilitiesAssumed1
Net fair value of assets (liabilities)	$ 0wfsl_NetFairValueOfAssetsLiabilities	$ (1,254,517)wfsl_NetFairValueOfAssetsLiabilities

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