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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, 2014	Sep. 30, 2013
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	$ 213,203	$ 362,248
Discount balance related to acquired loans	(34,483)	(66,301)
Covered loans, allowance for losses	(2,244)	0
Covered loans, net	176,476	295,947
Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	100,161	166,636
Covered loans, allowance for losses	0	0
Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	113,042	195,612
Covered loans, allowance for losses	(2,244)	0
Single-family residential
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	45,467	56,888
Single-family residential | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	23,067	28,460
Single-family residential | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	22,400	28,428
Construction - speculative
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	181	440
Construction - speculative | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0	0
Construction - speculative | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	181	440
Construction - custom
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0	1,197
Construction - custom | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0	0
Construction - custom | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0	1,197
Land - acquisition & development
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	6,953	22,763
Land - acquisition & development | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	1,364	4,810
Land - acquisition & development | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	5,589	17,953
Land - consumer lot loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	569	741
Land - consumer lot loans | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	73	245
Land - consumer lot loans | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	496	496
Multi-family
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	8,823	25,785
Multi-family | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	6,598	18,852
Multi-family | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	2,225	6,933
Commercial real estate
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	121,209	210,604
Commercial real estate | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	51,336	89,499
Commercial real estate | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	69,873	121,105
Commercial & industrial
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	14,386	24,365
Commercial & industrial | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	5,492	9,416
Commercial & industrial | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	8,894	14,949
HELOC
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	15,062	18,619
HELOC | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	11,777	14,750
HELOC | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	3,285	3,869
Consumer
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	553	846
Consumer | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	454	604
Consumer | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	99	242
Pool 1 - Construction and land A&D | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	20,261
Pool 2 - Single-family residential | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	15,964
Pool 3 - Multi-family | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	523
Pool 4 - HELOC & other consumer | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	3,977
Pool 5 - Commercial real estate | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	64,391
Pool 6 - Commercial & industrial | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	7,926
Pass
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	97.20%	95.60%
Pass | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	70,926
Grade as percentage of total gross assets	70.80%
Pass | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	64,208
Pass | Single-family residential | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	21,311
Pass | Construction - speculative | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Pass | Construction - custom | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Pass | Land - acquisition & development | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	972
Pass | Land - consumer lot loans | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	73
Pass | Multi-family | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	6,598
Pass | Commercial real estate | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	26,940
Pass | Commercial & industrial | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	2,801
Pass | HELOC | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	11,777
Pass | Consumer | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	454
Pass | Pool 1 - Construction and land A&D | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	8,349
Pass | Pool 2 - Single-family residential | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	15,585
Pass | Pool 3 - Multi-family | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	52
Pass | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	2,804
Pass | Pool 5 - Commercial real estate | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	33,909
Pass | Pool 6 - Commercial & industrial | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	3,509
Special mention
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	0.40%	0.50%
Special mention | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	115
Grade as percentage of total gross assets	0.10%
Special mention | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	700
Special mention | Single-family residential | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Construction - speculative | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Construction - custom | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Land - acquisition & development | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Land - consumer lot loans | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Multi-family | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Commercial real estate | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	115
Special mention | Commercial & industrial | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | HELOC | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Consumer | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Pool 1 - Construction and land A&D | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Pool 2 - Single-family residential | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Pool 3 - Multi-family | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Special mention | Pool 5 - Commercial real estate | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	700
Special mention | Pool 6 - Commercial & industrial | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Substandard
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	2.40%	3.90%
Substandard | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	29,120
Grade as percentage of total gross assets	29.10%
Substandard | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	47,609
Substandard | Single-family residential | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	1,756
Substandard | Construction - speculative | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Substandard | Construction - custom | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Substandard | Land - acquisition & development | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	392
Substandard | Land - consumer lot loans | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Substandard | Multi-family | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Substandard | Commercial real estate | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	24,281
Substandard | Commercial & industrial | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	2,691
Substandard | HELOC | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Substandard | Consumer | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Substandard | Pool 1 - Construction and land A&D | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	11,912
Substandard | Pool 2 - Single-family residential | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	379
Substandard | Pool 3 - Multi-family | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	471
Substandard | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	1,173
Substandard | Pool 5 - Commercial real estate | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	29,782
Substandard | Pool 6 - Commercial & industrial | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	3,892
Doubtful
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	0.00%	0.00%
Doubtful | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Grade as percentage of total gross assets	0.00%
Doubtful | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	525
Doubtful | Single-family residential | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Construction - speculative | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Construction - custom | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Land - acquisition & development | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Land - consumer lot loans | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Multi-family | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Commercial real estate | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Commercial & industrial | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | HELOC | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Consumer | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Pool 1 - Construction and land A&D | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Pool 2 - Single-family residential | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Pool 3 - Multi-family | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Pool 5 - Commercial real estate | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Doubtful | Pool 6 - Commercial & industrial | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	525
Loss
Covered Assets, Loan Status Designation [Line Items]
Grade as percentage of total gross assets	0.00%	0.00%
Loss | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Grade as percentage of total gross assets	0.00%
Loss | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Single-family residential | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Construction - speculative | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Construction - custom | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Land - acquisition & development | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Land - consumer lot loans | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Multi-family | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Commercial real estate | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Commercial & industrial | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | HELOC | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Consumer | Acquired non-impaired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Pool 1 - Construction and land A&D | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Pool 2 - Single-family residential | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Pool 3 - Multi-family | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Pool 5 - Commercial real estate | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	0
Loss | Pool 6 - Commercial & industrial | Credit-impaired acquired loans
Covered Assets, Loan Status Designation [Line Items]
Gross covered loans	$ 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 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

- Details

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

X

- Definition

Covered Loans, Allowance for Losses

+ References

No definition available.

+ 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

+ References

No definition available.

+ 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

+ References

No definition available.

+ 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

+ References

No definition available.

+ Details

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