XML 16 R9.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Dividends | 6 Months Ended
--- | ---
Mar. 31, 2013
Dividends [Abstract] |
Dividends | Dividends On April 19, 2013, the Company paid its 121st consecutive quarterly cash dividend on common stock. Dividends per share were $.09 and $.08 for the quarters ended March 31, 2013 and 2012, respectively.

X
- Details
Name: | us-gaap_DividendsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dividends [Text Block] + References No definition available. + Details
Name: | wfsl_DividendsTextBlock
Namespace Prefix: | wfsl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration