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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
INTEREST INCOME
Loans & covered assets	$ 109,274us-gaap_InterestAndFeeIncomeLoansAndLeases	$ 106,334us-gaap_InterestAndFeeIncomeLoansAndLeases	$ 217,567us-gaap_InterestAndFeeIncomeLoansAndLeases	$ 213,561us-gaap_InterestAndFeeIncomeLoansAndLeases
Mortgage-backed securities	18,143us-gaap_InterestIncomeSecuritiesMortgageBacked	20,968us-gaap_InterestIncomeSecuritiesMortgageBacked	37,318us-gaap_InterestIncomeSecuritiesMortgageBacked	40,360us-gaap_InterestIncomeSecuritiesMortgageBacked
Investment securities and cash equivalents	5,213wfsl_InvestmentIncomeAndOther	5,049wfsl_InvestmentIncomeAndOther	11,029wfsl_InvestmentIncomeAndOther	9,688wfsl_InvestmentIncomeAndOther
Interest Income	132,630us-gaap_InvestmentIncomeInterestAndDividend	132,351us-gaap_InvestmentIncomeInterestAndDividend	265,914us-gaap_InvestmentIncomeInterestAndDividend	263,609us-gaap_InvestmentIncomeInterestAndDividend
INTEREST EXPENSE
Customer accounts	12,574us-gaap_InterestExpenseDeposits	14,780us-gaap_InterestExpenseDeposits	26,018us-gaap_InterestExpenseDeposits	30,279us-gaap_InterestExpenseDeposits
FHLB advances and other borrowings	16,176us-gaap_InterestExpenseBorrowings	16,935us-gaap_InterestExpenseBorrowings	33,832us-gaap_InterestExpenseBorrowings	34,383us-gaap_InterestExpenseBorrowings
Interest Expense	28,750us-gaap_InterestExpense	31,715us-gaap_InterestExpense	59,850us-gaap_InterestExpense	64,662us-gaap_InterestExpense
Net interest income	103,880us-gaap_InterestIncomeExpenseNet	100,636us-gaap_InterestIncomeExpenseNet	206,064us-gaap_InterestIncomeExpenseNet	198,947us-gaap_InterestIncomeExpenseNet
Reversal of provision for loan losses	(3,949)us-gaap_ProvisionForLoanAndLeaseLosses	(4,336)us-gaap_ProvisionForLoanAndLeaseLosses	(9,449)us-gaap_ProvisionForLoanAndLeaseLosses	(8,936)us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after reversal of provision for loan losses	107,829us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	104,972us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	215,513us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	207,883us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
OTHER INCOME
Loan fee income	2,048us-gaap_FeesAndCommissionsMortgageBanking	1,324us-gaap_FeesAndCommissionsMortgageBanking	4,112us-gaap_FeesAndCommissionsMortgageBanking	3,370us-gaap_FeesAndCommissionsMortgageBanking
Deposit fee income	5,405us-gaap_FeesAndCommissionsDepositorAccounts	3,381us-gaap_FeesAndCommissionsDepositorAccounts	11,383us-gaap_FeesAndCommissionsDepositorAccounts	5,084us-gaap_FeesAndCommissionsDepositorAccounts
Other income	3,388us-gaap_NoninterestIncomeOtherOperatingIncome	1,997us-gaap_NoninterestIncomeOtherOperatingIncome	726us-gaap_NoninterestIncomeOtherOperatingIncome	4,036us-gaap_NoninterestIncomeOtherOperatingIncome
OTHER INCOME	10,841us-gaap_NoninterestIncome	6,702us-gaap_NoninterestIncome	16,221us-gaap_NoninterestIncome	12,490us-gaap_NoninterestIncome
OTHER EXPENSE
Compensation and benefits	30,469us-gaap_LaborAndRelatedExpense	27,836us-gaap_LaborAndRelatedExpense	59,629us-gaap_LaborAndRelatedExpense	52,962us-gaap_LaborAndRelatedExpense
Occupancy	8,239us-gaap_OccupancyNet	7,346us-gaap_OccupancyNet	16,374us-gaap_OccupancyNet	14,396us-gaap_OccupancyNet
FDIC insurance premiums	2,380us-gaap_FederalDepositInsuranceCorporationPremiumExpense	2,767us-gaap_FederalDepositInsuranceCorporationPremiumExpense	3,055us-gaap_FederalDepositInsuranceCorporationPremiumExpense	5,701us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Information technology	3,882us-gaap_InformationTechnologyAndDataProcessing	3,931us-gaap_InformationTechnologyAndDataProcessing	7,912us-gaap_InformationTechnologyAndDataProcessing	6,860us-gaap_InformationTechnologyAndDataProcessing
Product delivery	5,420wfsl_ProductDeliveryExpense	4,066wfsl_ProductDeliveryExpense	11,047wfsl_ProductDeliveryExpense	5,384wfsl_ProductDeliveryExpense
Other expense	6,934us-gaap_OtherNoninterestExpense	6,113us-gaap_OtherNoninterestExpense	12,909us-gaap_OtherNoninterestExpense	10,876us-gaap_OtherNoninterestExpense
Noninterest Expense	57,324us-gaap_NoninterestExpense	52,059us-gaap_NoninterestExpense	110,926us-gaap_NoninterestExpense	96,179us-gaap_NoninterestExpense
Gain (loss) on real estate acquired through foreclosure, net	1,473us-gaap_GainsLossesOnSalesOfOtherRealEstate	553us-gaap_GainsLossesOnSalesOfOtherRealEstate	1,788us-gaap_GainsLossesOnSalesOfOtherRealEstate	(1,398)us-gaap_GainsLossesOnSalesOfOtherRealEstate
Income before income taxes	62,819us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	60,168us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	122,596us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	122,796us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision	22,458us-gaap_IncomeTaxExpenseBenefit	21,511us-gaap_IncomeTaxExpenseBenefit	43,828us-gaap_IncomeTaxExpenseBenefit	43,903us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 40,361us-gaap_NetIncomeLoss	$ 38,657us-gaap_NetIncomeLoss	$ 78,768us-gaap_NetIncomeLoss	$ 78,893us-gaap_NetIncomeLoss
PER SHARE DATA
Basic earnings (in dollars per share)	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.81us-gaap_EarningsPerShareBasic	$ 0.77us-gaap_EarningsPerShareBasic
Diluted earnings (in dollars per share)	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.81us-gaap_EarningsPerShareDiluted	$ 0.77us-gaap_EarningsPerShareDiluted
Dividends paid on common stock (in dollars per share)	$ 0.13us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.10us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.28us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.20us-gaap_CommonStockDividendsPerShareCashPaid
Basic weighted average number of shares outstanding (in shares)	96,373,366us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	102,013,857us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	97,270,403us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	102,173,829us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average number of shares outstanding, including dilutive stock options (in shares)	96,725,234us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	102,488,844us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	97,635,201us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	102,652,984us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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