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Covered Assets - FDIC Indemnification Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014
FDIC Indemnification Asset [Roll Forward]
FDIC indemnification asset, beginning balance	$ 36,860wfsl_FdicLossShareReceivable	$ 64,615wfsl_FdicLossShareReceivable
Additions	0wfsl_AdditionsToFdicIndemnificationAsset	1,795wfsl_AdditionsToFdicIndemnificationAsset
Payments made (received)	430wfsl_FdicIndemnificationAssetPayments	(2,502)wfsl_FdicIndemnificationAssetPayments
Amortization	(7,074)wfsl_FdicIndemnificationAssetAmortization	(27,850)wfsl_FdicIndemnificationAssetAmortization
Accretion	140wfsl_FdicIndemnificationAssetDiscountAccretion	802wfsl_FdicIndemnificationAssetDiscountAccretion
FDIC indemnification asset, ending balance	$ 30,356wfsl_FdicLossShareReceivable	$ 36,860wfsl_FdicLossShareReceivable

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- Details

Name:	us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

FDIC Indemnification Asset, Additions

+ References

No definition available.

+ Details

Name:	wfsl_AdditionsToFdicIndemnificationAsset
Namespace Prefix:	wfsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

FDIC Indemnification Asset, Amortization

+ References

No definition available.

+ Details

Name:	wfsl_FdicIndemnificationAssetAmortization
Namespace Prefix:	wfsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

FDIC Indemnification Asset, Discount Accretion

+ References

No definition available.

+ Details

Name:	wfsl_FdicIndemnificationAssetDiscountAccretion
Namespace Prefix:	wfsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

FDIC Indemnification Asset, Payments

+ References

No definition available.

+ Details

Name:	wfsl_FdicIndemnificationAssetPayments
Namespace Prefix:	wfsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

The net present value of the amount expected to be received from the FDIC in connection with loss share agreements.

+ References

No definition available.

+ Details

Name:	wfsl_FdicLossShareReceivable
Namespace Prefix:	wfsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant