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Allowance for Losses on Loans (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	$ 118,158,000		$ 116,741,000	$ 133,147,000	$ 133,147,000
Charge-offs	(4,775,000)				(34,101,000)
Recoveries	6,298,000				16,345,000
Provisions & Transfers	(4,750,000)				1,350,000
Ending Allowance	114,931,000		114,931,000		116,741,000
Provision for (reversal of) loan losses	(4,336,000)	0	(8,936,000)	3,600,000
Loans receivable, gross	8,181,174,000		8,181,174,000		7,990,545,000
Additional provision (reversal) for loan losses recorded on acquired or covered loans			414,000
Nonaccrual loans by portfolio segment	100,198,000	149,033,000	100,198,000	149,033,000	131,299,000
Percentage increase (decrease) in nonperforming assets	(32.80%)		(32.80%)
Allowance for credit losses, charge-offs, net of recoveries		3,943,000	(1,523,000)
Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	67,692,000			81,815,000	81,815,000
Charge-offs	(2,444,000)				(20,947,000)
Recoveries	2,088,000				9,416,000
Provisions & Transfers	(3,988,000)				(6,100,000)
Ending Allowance	63,348,000		63,348,000		64,184,000
Loans receivable, gross	5,462,093,000		5,462,093,000		5,373,950,000
Nonaccrual loans by portfolio segment	81,740,000		81,740,000		100,460,000
Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	8,142,000			12,060,000	12,060,000
Charge-offs	(488,000)				(1,446,000)
Recoveries	0				501,000
Provisions & Transfers	(881,000)				(2,708,000)
Ending Allowance	6,773,000		6,773,000		8,407,000
Loans receivable, gross	135,001,000		135,001,000		130,778,000
Nonaccrual loans by portfolio segment	2,132,000		2,132,000		4,560,000
Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	1,474,000			347,000	347,000
Charge-offs	0				(481,000)
Recoveries	0				0
Provisions & Transfers	125,000				1,016,000
Ending Allowance	1,599,000		1,599,000		882,000
Loans receivable, gross	354,279,000		354,279,000		302,722,000
Nonaccrual loans by portfolio segment	265,000		265,000		0
Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	7,084,000			15,598,000	15,598,000
Charge-offs	(85,000)				(3,983,000)
Recoveries	299,000				4,105,000
Provisions & Transfers	(1,271,000)				(6,555,000)
Ending Allowance	6,027,000		6,027,000		9,165,000
Loans receivable, gross	77,049,000		77,049,000		81,660,000
Nonaccrual loans by portfolio segment	2,113,000		2,113,000		2,903,000
Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	3,274,000			4,937,000	4,937,000
Charge-offs	(231,000)				(1,363,000)
Recoveries	0				40,000
Provisions & Transfers	(69,000)				(62,000)
Ending Allowance	2,974,000		2,974,000		3,552,000
Loans receivable, gross	116,864,000		116,864,000		124,984,000
Nonaccrual loans by portfolio segment	3,007,000		3,007,000		3,337,000
Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	4,109,000			5,280,000	5,280,000
Charge-offs	0				(1,043,000)
Recoveries	0				171,000
Provisions & Transfers	78,000				(592,000)
Ending Allowance	4,187,000		4,187,000		3,816,000
Loans receivable, gross	869,635,000		869,635,000		835,598,000
Nonaccrual loans by portfolio segment	2,199,000		2,199,000		6,573,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	5,868,000			1,956,000	1,956,000
Charge-offs	(73,000)				(747,000)
Recoveries	0				17,000
Provisions & Transfers	129,000				4,369,000
Ending Allowance	5,924,000		5,924,000		5,595,000
Loans receivable, gross	634,457,000		634,457,000		625,293,000
Nonaccrual loans by portfolio segment	7,101,000		7,101,000		11,736,000
Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	16,505,000			7,626,000	7,626,000
Charge-offs	(444,000)				(1,145,000)
Recoveries	2,852,000				95,000
Provisions & Transfers	1,490,000				10,038,000
Ending Allowance	20,403,000		20,403,000		16,614,000
Loans receivable, gross	351,705,000		351,705,000		326,450,000
Nonaccrual loans by portfolio segment	579,000		579,000		477,000
HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	943,000			965,000	965,000
Charge-offs	0				(163,000)
Recoveries	0				0
Provisions & Transfers	32,000				200,000
Ending Allowance	975,000		975,000		1,002,000
Loans receivable, gross	131,852,000		131,852,000		133,631,000
Nonaccrual loans by portfolio segment	441,000		441,000		263,000
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	3,067,000			2,563,000	2,563,000
Charge-offs	(1,010,000)				(2,783,000)
Recoveries	1,059,000				2,000,000
Provisions & Transfers	(395,000)				1,744,000
Ending Allowance	2,721,000		2,721,000		3,524,000
Loans receivable, gross	48,239,000		48,239,000		55,479,000
Nonaccrual loans by portfolio segment	621,000		621,000		990,000
Non-Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Additional provision (reversal) for loan losses recorded on acquired or covered loans	(4,750,000)
Acquired or Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Additional provision (reversal) for loan losses recorded on acquired or covered loans	(414,000)
Loans Collectively Evaluated for Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	114,096,000		114,096,000		113,268,000
Loans receivable, gross	7,737,348,000		7,737,348,000		7,495,504,000
Allowance as a percentage of outstanding loans and leases	1.50%		1.50%		1.50%
Loans Collectively Evaluated for Impairment [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	63,348,000		63,348,000		64,184,000
Loans receivable, gross	5,357,841,000		5,357,841,000		5,262,159,000
Allowance as a percentage of outstanding loans and leases	1.20%		1.20%		1.20%
Loans Collectively Evaluated for Impairment [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	6,713,000		6,713,000		7,307,000
Loans receivable, gross	123,185,000		123,185,000		115,554,000
Allowance as a percentage of outstanding loans and leases	5.40%		5.40%		6.30%
Loans Collectively Evaluated for Impairment [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	1,599,000		1,599,000		882,000
Loans receivable, gross	354,279,000		354,279,000		302,722,000
Allowance as a percentage of outstanding loans and leases	0.50%		0.50%		0.30%
Loans Collectively Evaluated for Impairment [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	5,252,000		5,252,000		6,943,000
Loans receivable, gross	64,917,000		64,917,000		67,521,000
Allowance as a percentage of outstanding loans and leases	8.10%		8.10%		10.30%
Loans Collectively Evaluated for Impairment [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	2,974,000		2,974,000		3,506,000
Loans receivable, gross	99,065,000		99,065,000		107,216,000
Allowance as a percentage of outstanding loans and leases	3.00%		3.00%		3.30%
Loans Collectively Evaluated for Impairment [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	4,187,000		4,187,000		3,711,000
Loans receivable, gross	857,244,000		857,244,000		824,279,000
Allowance as a percentage of outstanding loans and leases	0.50%		0.50%		0.50%
Loans Collectively Evaluated for Impairment [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	5,924,000		5,924,000		5,595,000
Loans receivable, gross	439,307,000		439,307,000		400,789,000
Allowance as a percentage of outstanding loans and leases	1.30%		1.30%		1.40%
Loans Collectively Evaluated for Impairment [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	20,403,000		20,403,000		16,614,000
Loans receivable, gross	288,641,000		288,641,000		256,954,000
Allowance as a percentage of outstanding loans and leases	7.10%		7.10%		6.50%
Loans Collectively Evaluated for Impairment [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	975,000		975,000		1,002,000
Loans receivable, gross	111,530,000		111,530,000		111,169,000
Allowance as a percentage of outstanding loans and leases	0.90%		0.90%		0.90%
Loans Collectively Evaluated for Impairment [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	2,721,000		2,721,000		3,524,000
Loans receivable, gross	41,339,000		41,339,000		47,141,000
Allowance as a percentage of outstanding loans and leases	6.60%		6.60%		7.50%
Loans Individually Evaluated for Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	835,000		835,000		3,473,000
Loans receivable, gross	151,179,000		151,179,000		159,564,000
Allowance as a percentage of outstanding loans and leases	0.60%		0.60%		2.20%
Loans Individually Evaluated for Impairment [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0		0
Loans receivable, gross	90,746,000		90,746,000		96,989,000
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	60,000		60,000		1,100,000
Loans receivable, gross	11,816,000		11,816,000		15,224,000
Allowance as a percentage of outstanding loans and leases	0.50%		0.50%		7.20%
Loans Individually Evaluated for Impairment [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0		0
Loans receivable, gross	0		0		0
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	775,000		775,000		2,222,000
Loans receivable, gross	9,238,000		9,238,000		10,254,000
Allowance as a percentage of outstanding loans and leases	8.40%		8.40%		21.70%
Loans Individually Evaluated for Impairment [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0		46,000
Loans receivable, gross	14,558,000		14,558,000		14,455,000
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%		0.30%
Loans Individually Evaluated for Impairment [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0		105,000
Loans receivable, gross	8,853,000		8,853,000		7,405,000
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%		1.40%
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0		0
Loans receivable, gross	14,938,000		14,938,000		14,172,000
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0		0
Loans receivable, gross	10,000		10,000		48,000
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0		0
Loans receivable, gross	1,020,000		1,020,000		1,017,000
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%		0.00%
Loans Individually Evaluated for Impairment [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0		0		0
Loans receivable, gross	0		0		0
Allowance as a percentage of outstanding loans and leases	0.00%		0.00%		0.00%
Nonperforming Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans receivable, gross	174,789,000	246,075,000	174,789,000	246,075,000
Grade as percentage of total gross loans	1.22%	1.88%	1.22%	1.88%
Nonaccrual loans by portfolio segment	100,198,000		100,198,000		131,299,000
Nonperforming Financing Receivable [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	81,740,000		81,740,000		100,460,000
Nonperforming Financing Receivable [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	2,132,000		2,132,000		4,560,000
Nonperforming Financing Receivable [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	265,000		265,000		0
Nonperforming Financing Receivable [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	2,113,000		2,113,000		2,903,000
Nonperforming Financing Receivable [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	3,007,000		3,007,000		3,337,000
Nonperforming Financing Receivable [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	2,199,000		2,199,000		6,573,000
Nonperforming Financing Receivable [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	7,101,000		7,101,000		11,736,000
Nonperforming Financing Receivable [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	579,000		579,000		477,000
Nonperforming Financing Receivable [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	441,000		441,000		263,000
Nonperforming Financing Receivable [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	$ 621,000		$ 621,000		$ 990,000

X

- 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)

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9



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-Name Accounting Standards Codification

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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.

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

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-Name Accounting Standards Codification

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-Number 210

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Allowance as a Percentage of Outstanding Loans and Leases

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No definition available.

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Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries

+ References

No definition available.

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Financing Receivable, Allowance for Credit Losses, Provision and Transfers

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- Definition

Grade as Percentage of Total Gross Loans

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Balance Type:	na
Period Type:	instant

X

- Definition

Percentage Increase (Decrease) in Nonperforming Assets

+ References

No definition available.

+ Details

Name:	wfsl_PercentageIncreaseDecreaseInNonperformingAssets
Namespace Prefix:	wfsl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant