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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
ASSETS
Cash and cash equivalents	$ 542,769us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 781,843us-gaap_CashAndCashEquivalentsAtCarryingValue
Available-for-sale securities, at fair value	2,895,056us-gaap_AvailableForSaleSecurities	3,049,442us-gaap_AvailableForSaleSecurities
Held-to-maturity securities, at amortized cost	1,516,219us-gaap_HeldToMaturitySecurities	1,548,265us-gaap_HeldToMaturitySecurities
Loans receivable, net	8,253,917us-gaap_LoansAndLeasesReceivableNetReportedAmount	8,148,322us-gaap_LoansAndLeasesReceivableNetReportedAmount
Covered loans, net	161,478wfsl_LoansAndLeasesReceivableCoveredLoansNetReportedAmount	176,476wfsl_LoansAndLeasesReceivableCoveredLoansNetReportedAmount
Interest receivable	40,757us-gaap_AccruedInvestmentIncomeReceivable	52,037us-gaap_AccruedInvestmentIncomeReceivable
Premises and equipment, net	254,284us-gaap_PropertyPlantAndEquipmentNet	257,543us-gaap_PropertyPlantAndEquipmentNet
Real estate held for sale	61,970us-gaap_RealEstateHeldforsale	55,072us-gaap_RealEstateHeldforsale
Real estate held for investment	3,994us-gaap_RealEstateInvestmentPropertyNet	4,808us-gaap_RealEstateInvestmentPropertyNet
Covered real estate held for sale	19,405wfsl_RealEstateHeldForSaleCoveredRealEstateHeldForSale	24,082wfsl_RealEstateHeldForSaleCoveredRealEstateHeldForSale
FDIC indemnification asset	30,356wfsl_FdicLossShareReceivable	36,860wfsl_FdicLossShareReceivable
FHLB and FRB stock	154,870us-gaap_FederalHomeLoanBankStock	158,839us-gaap_FederalHomeLoanBankStock
Bank owned life insurance	100,216us-gaap_BankOwnedLifeInsurance	0us-gaap_BankOwnedLifeInsurance
Intangible assets, net	301,885wfsl_GoodwillAndIntangibleAssetsNet	302,909wfsl_GoodwillAndIntangibleAssetsNet
Federal and state income tax assets, net	0us-gaap_IncomeTaxReceivable	16,515us-gaap_IncomeTaxReceivable
Other assets	157,580us-gaap_OtherAssets	143,028us-gaap_OtherAssets
Assets	14,494,756us-gaap_Assets	14,756,041us-gaap_Assets
Customer accounts
Transaction deposit accounts	5,464,198wfsl_TransactionDeposits	5,490,687wfsl_TransactionDeposits
Time deposit accounts	5,114,655us-gaap_TimeDeposits	5,226,241us-gaap_TimeDeposits
Customer accounts	10,578,853wfsl_SavingsAndDemandAccountsAndRepurchaseAgreementsWithCustomers	10,716,928wfsl_SavingsAndDemandAccountsAndRepurchaseAgreementsWithCustomers
FHLB advances	1,830,000us-gaap_FederalHomeLoanBankAdvancesLongTerm	1,930,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
Advance payments by borrowers for taxes and insurance	19,301us-gaap_AdvancePaymentsByBorrowersForTaxesAndInsurance	29,004us-gaap_AdvancePaymentsByBorrowersForTaxesAndInsurance
Federal and state income taxes, net	4,278us-gaap_AccruedIncomeTaxes	0us-gaap_AccruedIncomeTaxes
Accrued expenses and other liabilities	80,985us-gaap_AccountsPayableAndOtherAccruedLiabilities	106,826us-gaap_AccountsPayableAndOtherAccruedLiabilities
Liabilities	12,513,417us-gaap_Liabilities	12,782,758us-gaap_Liabilities
Stockholders’ equity
Common stock, $1.00 par value, 300,000,000 shares authorized; 133,590,428 and 133,322,909 shares issued; 97,556,077 and 98,404,705 shares outstanding	133,591us-gaap_CommonStockValue	133,323us-gaap_CommonStockValue
Paid-in capital	1,639,350us-gaap_AdditionalPaidInCapitalCommonStock	1,638,211us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive income, net of taxes	23,435us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	20,708us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost; 36,034,351 and 34,918,204 shares	(549,434)us-gaap_TreasuryStockValue	(525,108)us-gaap_TreasuryStockValue
Retained earnings	734,397us-gaap_RetainedEarningsAccumulatedDeficit	706,149us-gaap_RetainedEarningsAccumulatedDeficit
Stockholders' equity	1,981,339us-gaap_StockholdersEquity	1,973,283us-gaap_StockholdersEquity
Liabilities and equity	$ 14,494,756us-gaap_LiabilitiesAndStockholdersEquity	$ 14,756,041us-gaap_LiabilitiesAndStockholdersEquity

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Sum of the carrying values as of the balance sheet date of liabilities incurred and payable to vendors for goods and services received, and other costs not separately disclosed in the balance sheet that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered.

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