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Customer Accounts (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010
Customer Accounts Greater than $250,000	$ 921,462	$ 893,338
Checking accounts, .50% and under	779,053	666,372
Passbook and statement accounts, .50% and under	255,396	234,673
Insured money market accounts, .01% to .75%	1,627,739	1,653,717
Certificate accounts
Less than 2.00%	4,170,232	3,608,935
2.00% to 2.99%	1,229,918	1,929,112
3.00% to 3.99%	418,720	498,956
4.00% to 4.99%	174,854	237,852
5.00% to 5.99%	9,991	22,923
Total certificates	6,003,715	6,297,778
Savings and Demand Accounts and Repurchase Agreements with Customers	8,665,903	8,852,540
Within 1 year	3,973,028	4,312,825
1 to 2 years	1,388,885	1,169,950
2 to 3 years	274,704	533,217
Over 3 years	$ 367,098	$ 281,786

X

- Definition

Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

+ References

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 14

-Subparagraph a(i)

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It 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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Balance Type:	credit
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X

- Definition

Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).

+ References

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Chapter 13

-Paragraph 6

-IssueDate 2006-05-01

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

Amount of interest-bearing domestic checking deposit liabilities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

The aggregate amount of time deposits, including certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

Certificate Accounts [Abstract]

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Certificates of Deposit, 1 to 2 years

+ Details

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Balance Type:	credit
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X

- Definition

Certificates of Deposit, 2 to 3 Years

+ Details

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Balance Type:	credit
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- Definition

Certificates of Deposit, Over 3 Years

+ Details

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X

- Definition

Certificates of Deposit, Within One Year

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Customer Accounts Greater than $250,000

+ Details

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Balance Type:	credit
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X

- Definition

Savings and Demand Accounts and Repurchase Agreements with Customers

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Namespace Prefix:	wfsl
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Time Deposits, From Five Percent to Less than Six Percent

+ Details

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Namespace Prefix:	wfsl
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Balance Type:	credit
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- Definition

Time Deposits, From Four Percent to Less than Five Percent

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Namespace Prefix:	wfsl
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Balance Type:	credit
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X

- Definition

Time Deposits, From Three Percent to Less than Four Percent

+ Details

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Namespace Prefix:	wfsl
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Balance Type:	credit
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- Definition

Time Deposits, From Two Percent to Less than Three Percent

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Namespace Prefix:	wfsl
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Balance Type:	credit
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- Definition

Time Deposits, Less than Two Percent

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