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Consolidated Statements of Cash Flows (Unaudited) (USD $) | 3 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net income | $ 33,418,000 | $ 24,530,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization (accretion) of fees, discounts, premiums and intangible assets, net | 6,890,000 | 5,097,000
Cash received from FDIC under loss share | 6,761,000 | 14,220,000
Depreciation | 1,875,000 | 1,650,000
Stock option compensation expense | 300,000 | 300,000
Provision for loan losses | 11,209,000 | 26,000,000
Loss on real estate held for sale, net | 19,859,000 | 10,553,000
Increase in accrued interest receivable | (1,391,000) | (2,750,000)
Increase in FDIC loss share receivable | (1,356,000) | (770,000)
Increase in income taxes payable | 18,813,000 | 13,796,000
FHLB stock dividends | 170,000 | (2,000)
Increase in intangible assets | (1,061,000) | 0
Decrease in other assets | 4,759,000 | 8,376,000
Increase (decrease) in accrued expenses and other liabilities | 2,022,000 | (23,987,000)
Net cash provided by operating activities | 102,268,000 | 77,013,000
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Net principal collections (loan originations) | 203,949,000 | 251,062,000
Available-for-sale securities purchased | (581,337,000) | (572,539,000)
Principal payments and maturities of available-for-sale securities | 276,982,000 | 209,768,000
Available-for-sale securities sold | 3,500,000 | 0
Principal payments and maturities of held-to-maturity securities | 4,845,000 | 11,555,000
Net cash received from acquisition | 50,451,000 | 0
Proceeds from sales of real estate held for sale | 28,801,000 | 23,708,000
Proceeds from sales of covered REO | 11,881,000 | 1,758,000
Premises and equipment purchased | (9,308,000) | (4,371,000)
Net cash used by investing activities | (10,236,000) | (79,059,000)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Net increase (decrease) in customer accounts | 73,982,000 | (6,908,000)
Net decrease in borrowings | (18,873,000) | (1,470,000)
Proceeds from exercise of common stock options | 2,000 | 117,000
Dividends paid on common stock | (8,517,000) | (6,791,000)
Treasury stock purchased, net | (20,311,000) | (4,561,000)
Decrease in advance payments by borrowers for taxes and insurance | (24,406,000) | (24,075,000)
Net cash provided (used) by financing activities | 1,877,000 | (43,688,000)
Increase (decrease) in cash and cash equivalents | 93,909,000 | (45,734,000)
Cash and cash equivalents at beginning of period | 816,002,000 | 888,622,000
Cash and cash equivalents at end of period | 909,911,000 | 842,888,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION |  |
Non-covered real estate acquired through foreclosure | 42,774,000 | 31,528,000
Covered real estate acquired through foreclosure | 5,472,000 | 18,445,000
Interest | 53,776,000 | 63,074,000
Income taxes | 0 | 2,000
The following summarizes the non-cash activities related to acquisitions |  |
Fair value of assets acquired | 124,726,000 | 0
Fair value of liabilities assumed | (154,500,000) | 0
Net fair value of assets (liabilities) | $ (29,774,000) | $ 0

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Period Type: | duration

X
- 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 Increase Decrease in Federal Home Loan Bank Stock Dividends + References No definition available. + Details
Name: | wfsl_IncreaseDecreaseInFederalHomeLoanBankStockDividends
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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: | credit
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
- 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 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