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Allowance for Losses on Loans - Allowance for Losses on Loans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | $ 133,147 | $ 157,160
Charge-offs | (34,101) | (84,579)
Recoveries | 16,345 | 14,857
Provisions & Transfers | 1,350 | 45,709
Ending Allowance | 116,741 | 133,147
Single-family residential |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 81,815 | 83,307
Charge-offs | (20,947) | (53,789)
Recoveries | 9,416 | 8,164
Provisions & Transfers | (6,100) | 44,133
Ending Allowance | 64,184 | 81,815
Construction - speculative |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 12,060 | 13,828
Charge-offs | (1,446) | (4,916)
Recoveries | 501 | 711
Provisions & Transfers | (2,708) | 2,437
Ending Allowance | 8,407 | 12,060
Construction - custom |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 347 | 623
Charge-offs | (481) | 0
Recoveries | 0 | 0
Provisions & Transfers | 1,016 | (276)
Ending Allowance | 882 | 347
Land - acquisition & development |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 15,598 | 32,719
Charge-offs | (3,983) | (16,978)
Recoveries | 4,105 | 1,341
Provisions & Transfers | (6,555) | (1,484)
Ending Allowance | 9,165 | 15,598
Land - consumer lot loans |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 4,937 | 5,520
Charge-offs | (1,363) | (2,670)
Recoveries | 40 | 0
Provisions & Transfers | (62) | 2,087
Ending Allowance | 3,552 | 4,937
Multi-family |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 5,280 | 7,623
Charge-offs | (1,043) | (1,393)
Recoveries | 171 | 504
Provisions & Transfers | (592) | (1,454)
Ending Allowance | 3,816 | 5,280
Commercial real estate |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 1,956 | 4,331
Charge-offs | (747) | (814)
Recoveries | 17 | 225
Provisions & Transfers | 4,369 | (1,786)
Ending Allowance | 5,595 | 1,956
Commercial & industrial |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 7,626 | 5,099
Charge-offs | (1,145) | (249)
Recoveries | 95 | 2,366
Provisions & Transfers | 10,038 | 410
Ending Allowance | 16,614 | 7,626
HELOC |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 965 | 1,139
Charge-offs | (163) | (232)
Recoveries | 0 | 66
Provisions & Transfers | 200 | (8)
Ending Allowance | 1,002 | 965
Consumer |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |
Beginning Allowance | 2,563 | 2,971
Charge-offs | (2,783) | (3,538)
Recoveries | 2,000 | 1,480
Provisions & Transfers | 1,744 | 1,650
Ending Allowance | $ 3,524 | $ 2,563

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Financing Receivable, Allowance for Credit Loss, Recoveries + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration