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Allowance for Losses on Loans Internally Assigned Grade (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2011 | Sep. 30, 2010
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 8,299,074 | $ 8,777,106
Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 6,218,878 | 6,551,837
Residential Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 6,047,279 | 6,395,018
Residential Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 1,041
Residential Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 171,599 | 155,778
Residential Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Residential Portfolio Segment [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction, Speculative [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 140,459 | 169,712
Construction, Speculative [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 56,485 | 68,984
Construction, Speculative [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 21,035 | 7,689
Construction, Speculative [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 62,939 | 93,039
Construction, Speculative [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction, Speculative [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction, Custom [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 279,851 | 256,384
Construction, Custom [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 279,851 | 256,384
Construction, Custom [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction, Custom [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction, Custom [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction, Custom [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land, Acquisition and Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 200,692 | 307,230
Land, Acquisition and Development [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 44,888 | 110,088
Land, Acquisition and Development [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 44,840 | 9,868
Land, Acquisition and Development [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 110,964 | 187,274
Land, Acquisition and Development [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land, Acquisition and Development [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land, Consumer Lot Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 163,146 | 186,840
Land, Consumer Lot Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 162,670 | 186,840
Land, Consumer Lot Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land, Consumer Lot Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 476 | 0
Land, Consumer Lot Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Land, Consumer Lot Loans [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Multi Family Housing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 700,673 | 697,351
Multi Family Housing [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 663,582 | 661,820
Multi Family Housing [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 4,629 | 2,046
Multi Family Housing [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 32,462 | 33,485
Multi Family Housing [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Multi Family Housing [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 303,442 | 315,915
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 264,083 | 273,001
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 4,125 | 3,768
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 35,234 | 39,048
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Commercial Real Estate Portfolio Segment [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 98
Commercial and Industrial Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 109,332 | 83,070
Commercial and Industrial Loans [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 104,171 | 62,699
Commercial and Industrial Loans [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,128 | 10,436
Commercial and Industrial Loans [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,407 | 9,758
Commercial and Industrial Loans [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 2,245 | 0
Commercial and Industrial Loans [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 381 | 177
Home Equity Line of Credit [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 115,092 | 116,143
Home Equity Line of Credit [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 115,092 | 116,143
Home Equity Line of Credit [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Home Equity Line of Credit [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Home Equity Line of Credit [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Home Equity Line of Credit [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 67,509 | 92,624
Consumer Portfolio Segment [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 66,512 | 90,497
Consumer Portfolio Segment [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 528 | 1,150
Consumer Portfolio Segment [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 469 | 977
Consumer Portfolio Segment [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Consumer Portfolio Segment [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 0 | 0
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 7,804,613 | 8,221,474
Grade as percentage of total gross assets | 94.10% | 93.70%
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 76,285 | 35,998
Grade as percentage of total gross assets | 0.90% | 0.40%
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 415,550 | 519,359
Grade as percentage of total gross assets | 5.00% | 5.90%
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 2,245 | 0
Grade as percentage of total gross assets | 0.00% | 0.00%
Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 381 | 275
Grade as percentage of total gross assets | 0.00% | 0.00%
Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 370,294 |
Grade as percentage of total gross assets | 2.76% | 3.22%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -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 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Grade as Percentage of Total Gross Loans + Details
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Namespace Prefix: | wfsl
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant