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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
INTEREST INCOME |  |
Loans | $ 108,293 us-gaap_InterestAndFeeIncomeLoansAndLeases | $ 107,227 us-gaap_InterestAndFeeIncomeLoansAndLeases
Mortgage-backed securities | 19,175 us-gaap_InterestIncomeSecuritiesMortgageBacked | 19,368 us-gaap_InterestIncomeSecuritiesMortgageBacked
Investment securities and cash equivalents | 5,816 wfsl_InvestmentIncomeAndOther | 4,663 wfsl_InvestmentIncomeAndOther
Interest income | 133,284 us-gaap_InvestmentIncomeInterestAndDividend | 131,258 us-gaap_InvestmentIncomeInterestAndDividend
INTEREST EXPENSE |  |
Customer accounts | 13,445 us-gaap_InterestExpenseDeposits | 15,499 us-gaap_InterestExpenseDeposits
FHLB advances and other borrowings | 17,656 us-gaap_InterestExpenseBorrowings | 17,447 us-gaap_InterestExpenseBorrowings
Interest expense | 31,101 us-gaap_InterestExpense | 32,946 us-gaap_InterestExpense
Net interest income | 102,183 us-gaap_InterestIncomeExpenseNet | 98,312 us-gaap_InterestIncomeExpenseNet
Reversal of provision for loan losses | (5,500)us-gaap_ProvisionForLoanAndLeaseLosses | (4,600)us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after reversal of provision for loan losses | 107,683 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 102,912 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
OTHER INCOME |  |
Loan fee income | 2,065 us-gaap_FeesAndCommissionsMortgageBanking | 2,046 us-gaap_FeesAndCommissionsMortgageBanking
Deposit fee income | 5,977 us-gaap_FeesAndCommissionsDepositorAccounts | 1,704 us-gaap_FeesAndCommissionsDepositorAccounts
Other income (loss) | (2,662)us-gaap_NoninterestIncomeOtherOperatingIncome | 2,038 us-gaap_NoninterestIncomeOtherOperatingIncome
Noninterest income | 5,380 us-gaap_NoninterestIncome | 5,788 us-gaap_NoninterestIncome
OTHER EXPENSE |  |
Compensation and benefits | 29,160 us-gaap_LaborAndRelatedExpense | 25,126 us-gaap_LaborAndRelatedExpense
Occupancy | 8,135 us-gaap_OccupancyNet | 7,050 us-gaap_OccupancyNet
FDIC insurance premiums | 674 us-gaap_FederalDepositInsuranceCorporationPremiumExpense | 2,934 us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Information technology | 4,030 us-gaap_InformationTechnologyAndDataProcessing | 1,318 us-gaap_InformationTechnologyAndDataProcessing
Product delivery | 5,627 us-gaap_AmortizationOfIntangibleAssets | 2,929 us-gaap_AmortizationOfIntangibleAssets
Other expense | 5,974 us-gaap_OtherNoninterestExpense | 4,763 us-gaap_OtherNoninterestExpense
Noninterest expense | 53,600 us-gaap_NoninterestExpense | 44,120 us-gaap_NoninterestExpense
Gain (loss) on real estate acquired through foreclosure, net | 315 us-gaap_GainsLossesOnSalesOfOtherRealEstate | (1,951)us-gaap_GainsLossesOnSalesOfOtherRealEstate
Income before income taxes | 59,778 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 62,629 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision | 21,371 us-gaap_IncomeTaxExpenseBenefit | 22,393 us-gaap_IncomeTaxExpenseBenefit
NET INCOME | $ 38,407 us-gaap_NetIncomeLoss | $ 40,236 us-gaap_NetIncomeLoss
PER SHARE DATA |  |
Basic earnings (in dollars per share) | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic
Diluted earnings (in dollars per share) | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted
Cash dividends per share (in dollars per share) | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid
Basic weighted average number of shares outstanding (in shares) | 98,147,939 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 102,329,578 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average number of shares outstanding, including dilutive stock options (in shares) | 98,524,839 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 102,813,154 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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