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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 80,475	$ 102,690
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization (accretion) of fees, discounts, premiums and intangible assets, net	32,456	7,488
Cash received from FDIC under loss share	20,977	76,140
Depreciation	4,950	4,200
Stock option compensation expense	815	922
Provision for loan losses	77,750	153,909
Loss on investment securities and real estate held for sale, net	20,222	39,958
Gain on FDIC-assisted transaction	0	(85,608)
Decrease (increase) in accrued interest receivable	(2,853)	7,024
Increase (decrease) in income taxes payable/receivable	3,575	(28,350)
FHLB stock dividends	(5)	(4)
Decrease (increase) in other assets	8,533	(59,778)
Decrease in accrued expenses and other liabilities	(25,175)	(66,101)
Net cash provided by operating activities	221,720	152,490
CASH FLOWS FROM INVESTING ACTIVITIES
(Loan originations) principal collections, net	336,426	185,715
Available-for-sale securities purchased	(1,279,983)	(1,001,644)
Principal payments and maturities of available-for-sale securities	485,597	643,263
Available-for-sale securities sold	131,361	368,309
Principal payments and maturities of held-to-maturity securities	31,383	17,972
Net cash received from acquisition	0	111,684
Proceeds from sales of real estate held for sale	63,575	103,323
Premises and equipment purchased	(7,695)	(8,838)
Net cash provided (used) by investing activities	(239,336)	419,784
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in customer accounts	(138,850)	224,909
Net decrease in borrowings	(2,551)	(137,138)
Proceeds from exercise of common stock options	1,045	1,757
Dividends paid	(20,232)	(16,829)
Treasury stock purchased	(36,620)	0
Decrease in advance payments by borrowers for taxes and insurance	(15,638)	(14,418)
Net cash provided (used) by financing activities	(212,846)	58,281
Increase in cash and cash equivalents	(230,462)	630,555
Cash and cash equivalents at beginning of period	888,622	498,388
Cash and cash equivalents at ending of period	658,160	1,128,943
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Non-covered real estate acquired through foreclosure	64,873	192,091
Covered real estate acquired through foreclosure	46,008	24,459
Interest	174,511	203,754
Income taxes	$ 41,627	$ 27,489

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Increase/ (decrease) in advances by borrowers for taxes and insurance

+ 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

+ Details

Name:	wfsl_IncreaseDecreaseInFdicIndemnificationAsset
Namespace Prefix:	wfsl
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase Decrease in Federal Home Loan Bank Stock Dividends

+ 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

+ Details

Name:	wfsl_LoansOriginatedNetOfPrincipalCollections
Namespace Prefix:	wfsl
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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.

+ Details

Name:	wfsl_NonCoveredRealEstateAcquiredThroughForeclosure
Namespace Prefix:	wfsl
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration