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Dividends (Details) (USD $)	3 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Jan. 21, 2015
Subsequent Event [Line Items]
Cash dividends per share (in dollars per share)	$ 0.15us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.11us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.10us-gaap_CommonStockDividendsPerShareCashPaid
Common Stock, Dividends, Per Share, Declared		$ 0.11us-gaap_CommonStockDividendsPerShareDeclared
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared				$ 0.13us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common Stock, Dividends, Increase in Declared Amount, Per Share				$ 0.02wfsl_CommonStockDividendsIncreaseinDeclaredAmountPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common Stock, Dividends, Increase in Declared Amount, Percent				18.00%wfsl_CommonStockDividendsIncreaseinDeclaredAmountPercent / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

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