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Covered Assets Credit Risk Profile by Internally Assigned Grade by Loan Status Designation (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Sep. 30, 2010
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	$ 495,358	$ 685,384
Discount balance related to acquired loans	109,409	150,910
Covered loans, allowance for losses	(3,766)	0
Covered loans, net	382,183	534,474
Single Family Residential [Member] | Pass [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	3,667
Single Family Residential [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	45,619
Construction, Speculative [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	1,315
Construction, Custom [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Land, Acquisition and Development [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	8,383
Land, Consumer Lot Loans [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	543
Multi Family Housing [Member] | Pass [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Multi Family Housing [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	32,448
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	418
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	118,124
Commercial and Industrial Loans [Member] | Pass [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	2,859
Commercial and Industrial Loans [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	13,717
Home Equity Line of Credit [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	21,730
Consumer Portfolio Segment [Member] | Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	1,199
Construction, Speculative and Land, Acquisition and Development [Member] | Pass [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	9,982
Pass [Member]
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	94.10%	93.70%
Pass [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	20,470
Pass [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	3,544
Pass [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	243,078
Grade as percentage of total gross assets	83.10%
Single Family Residential [Member] | Special Mention [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Single Family Residential [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Speculative [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Custom [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Land, Acquisition and Development [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	6,315
Land, Consumer Lot Loans [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Multi Family Housing [Member] | Special Mention [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Multi Family Housing [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	30,579
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	1,361
Commercial and Industrial Loans [Member] | Special Mention [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	2,725
Commercial and Industrial Loans [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	4,481
Home Equity Line of Credit [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Consumer Portfolio Segment [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Speculative and Land, Acquisition and Development [Member] | Special Mention [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	2,980
Special Mention [Member]
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	0.90%	0.40%
Special Mention [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	36,284
Special Mention [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special Mention [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	12,157
Grade as percentage of total gross assets	4.20%
Single Family Residential [Member] | Substandard [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	8,263
Single Family Residential [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	595
Construction, Speculative [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Custom [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Land, Acquisition and Development [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	360
Land, Consumer Lot Loans [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	111
Multi Family Housing [Member] | Substandard [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	3,324
Multi Family Housing [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	2,458
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	48,069
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	28,979
Commercial and Industrial Loans [Member] | Substandard [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	25,662
Commercial and Industrial Loans [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	4,239
Home Equity Line of Credit [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Consumer Portfolio Segment [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Speculative and Land, Acquisition and Development [Member] | Substandard [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	54,682
Substandard [Member]
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	5.00%	5.90%
Substandard [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	145,411
Substandard [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	5,411
Substandard [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	36,742
Grade as percentage of total gross assets	12.60%
Single Family Residential [Member] | Doubtful [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Single Family Residential [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Speculative [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Custom [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Land, Acquisition and Development [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Land, Consumer Lot Loans [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Multi Family Housing [Member] | Doubtful [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Multi Family Housing [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Commercial and Industrial Loans [Member] | Doubtful [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	772
Commercial and Industrial Loans [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	444
Home Equity Line of Credit [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Consumer Portfolio Segment [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Speculative and Land, Acquisition and Development [Member] | Doubtful [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful [Member]
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	0.00%	0.00%
Doubtful [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	772
Doubtful [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	444
Grade as percentage of total gross assets	0.20%
Single Family Residential [Member] | Loss [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Single Family Residential [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Speculative [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Custom [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Land, Acquisition and Development [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Land, Consumer Lot Loans [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Multi Family Housing [Member] | Loss [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Multi Family Housing [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Commercial Real Estate Portfolio Segment [Member] | Loss [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Commercial Real Estate Portfolio Segment [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Commercial and Industrial Loans [Member] | Loss [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Commercial and Industrial Loans [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Home Equity Line of Credit [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Consumer Portfolio Segment [Member] | Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Construction, Speculative and Land, Acquisition and Development [Member] | Loss [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss [Member]
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	0.00%	0.00%
Loss [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Grade as percentage of total gross assets	0.00%
Single Family Residential [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	11,930
Single Family Residential [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	46,214
Construction, Speculative [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	1,315
Construction, Custom [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Land, Acquisition and Development [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	15,058
Land, Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	654
Multi Family Housing [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	3,324
Multi Family Housing [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	34,906
Commercial Real Estate Portfolio Segment [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	79,066
Commercial Real Estate Portfolio Segment [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	148,464
Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	32,018
Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	22,881
Home Equity Line of Credit [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	21,730
Consumer Portfolio Segment [Member] | Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	1,199
Construction, Speculative and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	67,644
Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	8,955
Acquired Non Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	292,421	378,552
Covered loans, allowance for losses	0	0
Acquired Impaired Assets [Member]
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	202,937	306,832
Covered loans, allowance for losses	$ (3,766)	$ 0

X

- Definition

Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

+ Details

Name:	us-gaap_ReceivableWithImputedInterestDiscount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Covered Assets, Loan Status Designation [Line Items]

+ Details

Name:	wfsl_CoveredAssetsLoanStatusDesignationLineItems
Namespace Prefix:	wfsl
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Covered Loans, Allowance for Losses

+ Details

Name:	wfsl_CoveredLoansAllowanceForLosses
Namespace Prefix:	wfsl
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Grade as Percentage of Total Gross Loans

+ Details

Name:	wfsl_GradeAsPercentageOfTotalGrossLoans
Namespace Prefix:	wfsl
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Loans and Leases Receivable, Covered Loans, Gross

+ Details

Name:	wfsl_LoansAndLeasesReceivableCoveredLoansGross
Namespace Prefix:	wfsl
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Loans and Leases Receivable, Covered Loans, Net Reported Amount

+ Details

Name:	wfsl_LoansAndLeasesReceivableCoveredLoansNetReportedAmount
Namespace Prefix:	wfsl
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant