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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) - USD ($) $ in Thousands | Jun. 30, 2015 | Sep. 30, 2014
--- | --- | ---
ASSETS |  |
Cash and cash equivalents | $ 349,550 | $ 781,843
Available-for-sale securities, at fair value | 2,624,374 | 3,049,442
Held-to-maturity securities, at amortized cost | 1,586,514 | 1,548,265
Loans receivable, net | 8,645,609 | 8,148,322
Covered loans, net | 77,311 | 176,476
Interest receivable | 39,550 | 52,037
Premises and equipment, net | 267,835 | 257,543
Real estate held for sale | 55,491 | 55,072
Real estate held for investment | 4,336 | 4,808
Covered real estate held for sale | 4,434 | 24,082
FDIC indemnification asset | 18,783 | 36,860
FHLB and FRB stock | 103,189 | 158,839
Bank owned life insurance | 101,720 | 0
Intangible assets, net | 300,109 | 302,909
Federal and state income tax assets, net | 11,286 | 16,515
Other assets | 180,405 | 143,028
Assets | 14,370,496 | 14,756,041
Customer accounts |  |
Transaction deposit accounts | 5,696,536 | 5,490,687
Time deposit accounts | 4,881,849 | 5,226,241
Customer accounts | 10,578,385 | 10,716,928
FHLB advances | 1,730,000 | 1,930,000
Advance payments by borrowers for taxes and insurance | 30,656 | 29,004
Accrued expenses and other liabilities | 72,334 | 106,826
Liabilities | 12,411,375 | 12,782,758
Stockholders’ equity |  |
Common stock, $1.00 par value, 300,000,000 shares authorized; 133,688,179 and 133,322,909 shares issued; 93,982,148 and 98,404,705 shares outstanding | 133,688 | 133,323
Paid-in capital | 1,643,243 | 1,638,211
Accumulated other comprehensive income, net of taxes | 10,977 | 20,708
Treasury stock, at cost; 39,706,031 and 34,918,204 shares | (628,157) | (525,108)
Retained earnings | 799,370 | 706,149
Stockholders' Equity Attributable to Parent | 1,959,121 | 1,973,283
Liabilities and Equity | $ 14,370,496 | $ 14,756,041

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts of all goodwill and intangible assets of the balance sheet date, net of accumulated amortization and impairment charges. + References No definition available. + Details
Name: | wfsl_GoodwillAndIntangibleAssetsNet
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans and Leases Receivable, Covered Loans, Net Reported Amount + References No definition available. + Details
Name: | wfsl_LoansAndLeasesReceivableCoveredLoansNetReportedAmount
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of covered investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References No definition available. + Details
Name: | wfsl_RealEstateHeldForSaleCoveredRealEstateHeldForSale
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Savings and Demand Accounts and Repurchase Agreements with Customers + References No definition available. + Details
Name: | wfsl_SavingsAndDemandAccountsAndRepurchaseAgreementsWithCustomers
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Transaction Deposits + References No definition available. + Details
Name: | wfsl_TransactionDeposits
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant