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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net income | $ 71,260 | $ 67,489
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization (accretion) of fees, discounts, premiums and intangible assets, net | 2,488 | 20,703
Cash received from (paid to) FDIC under loss share | 11,668 | (4,068)
Depreciation | 4,600 | 3,750
Stock option compensation expense | 600 | 600
Provision for loan losses | 3,600 | 29,210
Loss (gain) on real estate held for sale, net | 3,028 | (1,285)
Decrease (increase) in accrued interest receivable | 3,440 | (1,536)
Increase in FDIC loss share receivable | (777) | (2,052)
Increase (decrease) in income taxes payable | (13,937) | 6,031
Decrease in other assets | 35,712 | 8,832
Increase (decrease) in accrued expenses and other liabilities | (8,770) | 1,955
Net cash provided by operating activities | 112,912 | 129,629
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Net principal collections (loan originations) | 381,932 | 342,513
FHLB stock redemptions | 1,382 | 1,512
Available-for-sale securities purchased | (356,966) | (1,241,126)
Principal payments and maturities of available-for-sale securities | 100,906 | 758,676
Available-for-sale securities sold | 43,199 | 3,500
Held-to-maturity securities purchased | (407,135) | 0
Principal payments and maturities of available-for-sale securities | 132,755 | 8,394
Net cash received from acquisition | 202,308 | 50,451
Proceeds from sales of real estate held for sale | 59,773 | 90,017
Proceeds from sales of covered REO | 7,645 | 22,959
Premises and equipment purchased and REO improvements | (18,048) | (11,737)
Net cash provided by investing activities | 147,751 | 25,159
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Net decrease in customer accounts | (161,712) | (3,253)
Net increase (decrease) in borrowings | 27,529 | (19,700)
Proceeds from exercise of common stock options | 152 | 28
Dividends paid on common stock | (18,930) | (17,078)
Treasury stock purchased | (53,224) | (30,307)
Decrease in advance payments by borrowers for taxes and insurance | (23,849) | (10,133)
Net cash used by financing activities | (230,034) | (80,443)
Increase in cash and cash equivalents | 30,629 | 74,345
Cash and cash equivalents at beginning of period | 751,430 | 816,002
Cash and cash equivalents at end of period | 782,059 | 890,347
Non-cash investing activities |  |
Non-covered real estate acquired through foreclosure | 52,760 | 73,466
Covered real estate acquired through foreclosure | 5,954 | 6,304
Cash paid during the period for |  |
Interest | 71,092 | 103,170
Income taxes | 32,465 | 31,947
The following summarizes the non-cash activities related to acquisitions |  |
Fair value of assets acquired | 819,904 | 124,726
Fair value of liabilities assumed | (776,009) | (154,500)
Net fair value of assets (liabilities) | $ 43,895 | $ (29,774)

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- Definition The amount of covered real estate investments acquired through foreclosure during the period. Title through foreclosure occurs in a legal proceeding in which a secured creditor obtains title typically be bidding the amount of debt owed to it after the borrower has defaulted on the debt instrument. + References No definition available. + Details
Name: | wfsl_CoveredRealEstateAcquiredThroughForeclosure
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net gain or loss on sale of investments in securities and other. + References No definition available. + Details
Name: | wfsl_GainLossOnSaleOfInvestmentsInSecuritiesAndOther
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase/ (decrease) in advances by borrowers for taxes and insurance + References No definition available. + Details
Name: | wfsl_IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (Decrease) in FDIC Indemnification Asset + References No definition available. + Details
Name: | wfsl_IncreaseDecreaseInFdicIndemnificationAsset
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (Decrease) in FDIC Loss Share Receivable + References No definition available. + Details
Name: | wfsl_IncreaseDecreaseInFdicLossShareReceivable
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans Originated Net of Principal Collections + References No definition available. + Details
Name: | wfsl_LoansOriginatedNetOfPrincipalCollections
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net Fair Value of Assets (Liabilities) + References No definition available. + Details
Name: | wfsl_NetFairValueOfAssetsLiabilities
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | wfsl_NonCashInvestingActivitiesAbstract
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of non-covered real estate investments acquired through foreclosure during the period. Title through foreclosure occurs in a legal proceeding in which a secured creditor obtains title typically be bidding the amount of debt owed to it after the borrower has defaulted on the debt instrument. + References No definition available. + Details
Name: | wfsl_NonCoveredRealEstateAcquiredThroughForeclosure
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Premises and Equipment Purchased and REO Improvements + References No definition available. + Details
Name: | wfsl_PremisesAndEquipmentPurchasedAndReoImprovements
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of covered real estate owned. + References No definition available. + Details
Name: | wfsl_ProceedsFromSalesOfCoveredRealEstateOwned
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration