$WAFD
WAFD INC Stock $wafd

$wafd Overview Financials Valuation SEC Filings Company Website

2018 Q3 Form 10-K Financial Statement

#000093652819000052 Filed on November 20, 2019

Income Statement

Concept	2018 Q3	2018 Q2	2018 Q1
Revenue	$157.2M	$155.1M	$149.1M
YoY Change	10.48%	12.6%	9.46%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$7.700M	$12.20M	$11.50M
YoY Change	-36.36%	12.96%	71.64%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$37.90M	$35.22M	$31.78M
YoY Change	27.15%	21.03%	11.62%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$67.34M	$64.49M	$64.77M
YoY Change	0.56%	-1.31%	3.16%
Income Tax	$15.83M	$13.10M	$15.50M
% Of Pretax Income	23.5%	20.31%	23.93%
Net Earnings	$51.52M	$51.39M	$49.27M
YoY Change	11.74%	16.51%	17.12%
Net Earnings / Revenue	32.78%	33.14%	33.05%
Basic Earnings Per Share	$0.62	$0.61	$0.58
Diluted Earnings Per Share	$0.62	$0.61	$0.57
COMMON SHARES
Basic Shares Outstanding	83.54M shares	84.17M shares	85.65M shares
Diluted Shares Outstanding		84.25M shares	85.75M shares

Balance Sheet

Concept	2018 Q3	2018 Q2	2018 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$268.7M	$345.9M	$256.8M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$268.0M	$269.7M	$265.4M
YoY Change	1.63%	0.06%	-2.33%
Goodwill	$301.4M	$301.4M	$301.4M
YoY Change	2.8%	3.38%	3.38%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$15.87B	$15.77B	$15.63B
YoY Change	4.01%	4.52%	4.49%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$94.00M	$90.00M	$139.0M
YoY Change	-28.24%	-25.0%	13.01%
Deferred Revenue
YoY Change
Short-Term Debt
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$94.00M	$90.00M	$139.0M
YoY Change	-28.24%	-25.0%	13.01%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$57.00M	$33.00M	$41.00M
YoY Change	0.0%	-2.94%	-2.38%
Total Long-Term Liabilities	$57.00M	$33.00M	$41.00M
YoY Change	0.0%	-2.94%	-2.38%
TOTAL LIABILITIES
Total Short-Term Liabilities	$94.00M	$90.00M	$139.0M
Total Long-Term Liabilities	$57.00M	$33.00M	$41.00M
Total Liabilities	$13.87B	$13.78B	$13.64B
YoY Change	4.69%	5.49%	5.4%
SHAREHOLDERS EQUITY
Retained Earnings	$1.189B	$1.152B	$1.115B
YoY Change	14.01%	14.1%	13.89%
Common Stock	$1.802B	$1.801B	$1.800B
YoY Change	0.34%	0.33%	0.35%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.002B	$975.0M	$935.0M
YoY Change	19.6%	24.02%	23.02%
Treasury Stock Shares	52.63M shares	51.81M shares	50.58M shares
Shareholders Equity	$1.997B	$1.986B	$1.989B
YoY Change
Total Liabilities & Shareholders Equity	$15.87B	$15.77B	$15.63B
YoY Change	4.01%	4.52%	4.49%

Cashflow Statement

Concept	2018 Q3	2018 Q2	2018 Q1
OPERATING ACTIVITIES
Net Income	$51.52M	$51.39M	$49.27M
YoY Change	11.74%	16.51%	17.12%
Depreciation, Depletion And Amortization	$7.700M	$12.20M	$11.50M
YoY Change	-36.36%	12.96%	71.64%
Cash From Operating Activities	$50.40M	$20.10M	$62.10M
YoY Change	-12.04%	-47.66%	47.51%
INVESTING ACTIVITIES
Capital Expenditures	-$4.500M	-$9.800M	-$6.300M
YoY Change	-25.0%	113.04%	133.33%
Acquisitions
YoY Change
Other Investing Activities	-$165.5M	-$52.10M	-$102.5M
YoY Change	-19.82%	135.75%	-51.28%
Cash From Investing Activities	-$170.0M	-$61.90M	-$108.8M
YoY Change	-19.92%	131.84%	-48.94%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	42.30M	130.9M	-6.100M
YoY Change	-61.12%	61.21%	-115.89%
NET CHANGE
Cash From Operating Activities	50.40M	20.10M	62.10M
Cash From Investing Activities	-170.0M	-61.90M	-108.8M
Cash From Financing Activities	42.30M	130.9M	-6.100M
Net Change In Cash	-77.30M	89.10M	-52.80M
YoY Change	67.32%	-4.09%	-60.18%
FREE CASH FLOW
Cash From Operating Activities	$50.40M	$20.10M	$62.10M
Capital Expenditures	-$4.500M	-$9.800M	-$6.300M
Free Cash Flow	$54.90M	$29.90M	$68.40M
YoY Change	-13.27%	-30.47%	52.68%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000936528
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CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000	shares
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CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-34654
CY2019	dei	Entity Registrant Name EntityRegistrantName	WASHINGTON FEDERAL INC
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	WA
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	91-1661606
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	425 Pike Street
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Seattle
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	98101
CY2019	dei	City Area Code CityAreaCode	206
CY2019	dei	Local Phone Number LocalPhoneNumber	624-7930
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $1.00 par value per share
CY2019	dei	Trading Symbol TradingSymbol	WAFD
CY2019	dei	Security Exchange Name SecurityExchangeName	NASDAQ
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CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.67
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.84
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80471316	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85008040	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	88905457	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80495163	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	85109843	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	89224207	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	210256000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	203850000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	173532000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	39195000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-21136000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-7587000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	9000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-3499000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-8915000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	6156000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1503000	USD
CY2019	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	30271000	USD
CY2018	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-14980000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	173532000	USD
CY2017Q3	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	16171000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	74519000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	7238000	USD
CY2017	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	5909000	USD
CY2017	wfsl	Adjustmentsto Additional Paidin Capital Warrants Exercised AdjustmentstoAdditionalPaidinCapitalWarrantsExercised	0	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	98374000	USD
CY2017Q3	us-gaap	Stockholders Equity StockholdersEquity	2005688000	USD
CY2017	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-2585000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-30127000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	23943000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	29653000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-6854000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	5684000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	10897000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-23273000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	18259000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	18756000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6998000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3279000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	16171000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	217254000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	207129000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	189703000	USD
CY2016Q3	us-gaap	Stockholders Equity StockholdersEquity	1975731000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	203850000	USD
CY2018	wfsl	Other Comprehensive Income Loss Excluding Cumulative Effect Adjustment Net Of Tax OtherComprehensiveIncomeLossExcludingCumulativeEffectAdjustmentNetOfTax	1507000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	55997000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1338000	USD
CY2018	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	4771000	USD
CY2018	wfsl	Adjustmentsto Additional Paidin Capital Warrants Exercised AdjustmentstoAdditionalPaidinCapitalWarrantsExercised	0	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	164249000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	1996908000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	210256000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6998000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	63318000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	740000	USD
CY2019	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	5265000	USD
CY2019	wfsl	Adjustmentsto Additional Paidin Capital Warrants Exercised AdjustmentstoAdditionalPaidinCapitalWarrantsExercised	0	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	123854000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	2032995000	USD
CY2017	wfsl	Amortization Accretion Of Fees Discounts Premiums And Intangible Assets Net AmortizationAccretionOfFeesDiscountsPremiumsAndIntangibleAssetsNet	41680000	USD
CY2019	wfsl	Increase Decrease In Fdic Indemnification Asset IncreaseDecreaseInFdicIndemnificationAsset	0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	210256000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	203850000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	5265000	USD
CY2017	wfsl	Increase Decrease In Fdic Indemnification Asset IncreaseDecreaseInFdicIndemnificationAsset	584000	USD
CY2018	wfsl	Increase Decrease In Fdic Indemnification Asset IncreaseDecreaseInFdicIndemnificationAsset	1595000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	173532000	USD
CY2019	wfsl	Amortization Accretion Of Fees Discounts Premiums And Intangible Assets Net AmortizationAccretionOfFeesDiscountsPremiumsAndIntangibleAssetsNet	31058000	USD
CY2018	wfsl	Amortization Accretion Of Fees Discounts Premiums And Intangible Assets Net AmortizationAccretionOfFeesDiscountsPremiumsAndIntangibleAssetsNet	46735000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-5450000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	4771000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	5909000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-1650000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-2100000	USD
CY2019	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-9000	USD
CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2017	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	3499000	USD
CY2019	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	1562000	USD
CY2018	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	5652000	USD
CY2017	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	3974000	USD
CY2019	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-1804000	USD
CY2018	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	1804000	USD
CY2017	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-16047000	USD
CY2019	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	5822000	USD
CY2018	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	5992000	USD
CY2017	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	6498000	USD
CY2019	wfsl	Gain Losson Bank Owned Life Insurance GainLossonBankOwnedLifeInsurance	0	USD
CY2018	wfsl	Gain Losson Bank Owned Life Insurance GainLossonBankOwnedLifeInsurance	2416000	USD
CY2017	wfsl	Gain Losson Bank Owned Life Insurance GainLossonBankOwnedLifeInsurance	6805000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	12484000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1450000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1673000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	17416000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	6876000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-7974000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	3043000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	0	USD
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	0	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	21553000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-36609000	USD
CY2017	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-41477000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	234054000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	190702000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	179700000	USD
CY2019	wfsl	Loans Originated Net Of Principal Collections LoansOriginatedNetOfPrincipalCollections	-452334000	USD
CY2018	wfsl	Loans Originated Net Of Principal Collections LoansOriginatedNetOfPrincipalCollections	-459183000	USD
CY2017	wfsl	Loans Originated Net Of Principal Collections LoansOriginatedNetOfPrincipalCollections	-896450000	USD
CY2019	us-gaap	Payments To Acquire Loans And Leases Held For Investment PaymentsToAcquireLoansAndLeasesHeldForInvestment	0	USD
CY2018	us-gaap	Payments To Acquire Loans And Leases Held For Investment PaymentsToAcquireLoansAndLeasesHeldForInvestment	143605000	USD
CY2017	us-gaap	Payments To Acquire Loans And Leases Held For Investment PaymentsToAcquireLoansAndLeasesHeldForInvestment	72856000	USD
CY2018	wfsl	Payments To Acquire Federal Home Loan Bank And Federal Reserve Bank Stock PaymentsToAcquireFederalHomeLoanBankAndFederalReserveBankStock	530000000	USD
CY2017	wfsl	Payments To Acquire Federal Home Loan Bank And Federal Reserve Bank Stock PaymentsToAcquireFederalHomeLoanBankAndFederalReserveBankStock	183609000	USD
CY2019	wfsl	Proceeds From Sale Of Federal Home Loan Bank And Federal Reserve Bank Stock ProceedsFromSaleOfFederalHomeLoanBankAndFederalReserveBankStock	535800000	USD
CY2018	wfsl	Proceeds From Sale Of Federal Home Loan Bank And Federal Reserve Bank Stock ProceedsFromSaleOfFederalHomeLoanBankAndFederalReserveBankStock	525800000	USD
CY2017	wfsl	Proceeds From Sale Of Federal Home Loan Bank And Federal Reserve Bank Stock ProceedsFromSaleOfFederalHomeLoanBankAndFederalReserveBankStock	177824000	USD
CY2019	wfsl	Payments To Acquire Federal Home Loan Bank And Federal Reserve Bank Stock PaymentsToAcquireFederalHomeLoanBankAndFederalReserveBankStock	532600000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	358709000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	272780000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	76367000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	224118000	USD
CY2019Q3	wfsl	Available For Sale Securities Yield AvailableForSaleSecuritiesYield	0.0327
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	199008000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	367713000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	491000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	362829000	USD
CY2019	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2018	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	170836000	USD
CY2017	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	466058000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	178147000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	187812000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	229716000	USD
CY2019	wfsl	Covered Real Estate Owned Purchased CoveredRealEstateOwnedPurchased	8659000	USD
CY2018	wfsl	Covered Real Estate Owned Purchased CoveredRealEstateOwnedPurchased	15192000	USD
CY2017	wfsl	Covered Real Estate Owned Purchased CoveredRealEstateOwnedPurchased	16248000	USD
CY2019	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2018	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	3484000	USD
CY2017	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	10096000	USD
CY2019	wfsl	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	5000000	USD
CY2018	wfsl	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	0	USD
CY2017	wfsl	Payments To Acquire Equity Securities PaymentsToAcquireEquitySecurities	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2211000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	3370000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	15585000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	5209000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	35530000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	27127000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	15461000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-421373000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-674445000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-544536000	USD
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	603846000	USD
CY2018	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	552445000	USD
CY2017	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	234460000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	13315000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	13250000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	4590000000	USD
CY2019	us-gaap	Repayments Of Debt RepaymentsOfDebt	13395000000	USD
CY2018	us-gaap	Repayments Of Debt RepaymentsOfDebt	13145000000	USD
CY2017	us-gaap	Repayments Of Debt RepaymentsOfDebt	4445000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	740000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1338000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	123854000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	164249000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	337827000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	98374000	USD
CY2019	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	413000	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	7238000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	63318000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	55997000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	74519000	USD
CY2018	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	786000	USD
CY2017	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	13733000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	439323000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	227538000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	150508000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-44420000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-137298000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	268650000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	313070000	USD
CY2016Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	450368000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	419158000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	268650000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	313070000	USD
CY2019	wfsl	Non Covered Real Estate Acquired Through Foreclosure NonCoveredRealEstateAcquiredThroughForeclosure	1839000	USD
CY2018	wfsl	Non Covered Real Estate Acquired Through Foreclosure NonCoveredRealEstateAcquiredThroughForeclosure	4032000	USD
CY2017	wfsl	Non Covered Real Estate Acquired Through Foreclosure NonCoveredRealEstateAcquiredThroughForeclosure	3266000	USD
CY2019	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	205000	USD
CY2018	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	3109000	USD
CY2017	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	0	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	1082000	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	3914000	USD
CY2017	us-gaap	Stock Issued1 StockIssued1	7632000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	194277000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	133722000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	111333000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	33545000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	44260000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	54078000	USD
CY2019Q3	wfsl	Number Of Offices NumberOfOffices	234	branch
CY2018Q3	us-gaap	Cash Collateral For Borrowed Securities CashCollateralForBorrowedSecurities	18000000	USD
CY2019	us-gaap	Fiscal Period FiscalPeriod	<div style="line-height:120%;padding-top:16px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company's fiscal year end is September 30. All references to </span><span style="font-family:inherit;font-size:10pt;">2019</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2017</span><span style="font-family:inherit;font-size:10pt;"> represent balances as of </span><span style="font-family:inherit;font-size:10pt;">September 30, 2019</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">September 30, 2018</span><span style="font-family:inherit;font-size:10pt;">, and </span><span style="font-family:inherit;font-size:10pt;">September 30, 2017</span><span style="font-family:inherit;font-size:10pt;">, or activity for the fiscal years then ended. </span></div>
CY2019Q3	us-gaap	Cash Collateral For Borrowed Securities CashCollateralForBorrowedSecurities	31850000	USD
CY2019	wfsl	Loans And Leases Receivable Days Past Grace Period To Initiate Contact To Cure Deficiency LoansAndLeasesReceivableDaysPastGracePeriodToInitiateContactToCureDeficiency	P30D
CY2019	wfsl	Loans And Leases Receivable Minimum Days Past Due To Begin Foreclosure Proceedings LoansAndLeasesReceivableMinimumDaysPastDueToBeginForeclosureProceedings	P90D
CY2019	wfsl	Loan Modification Basis Point Reduction Minimum LoanModificationBasisPointReductionMinimum	0.0100
CY2019	wfsl	Loan Modification Basis Point Reduction Maximum LoanModificationBasisPointReductionMaximum	0.0200
CY2019	wfsl	Loans And Leases Receivable Minimum Days Past Due To Stop Accrual Of Interest LoansAndLeasesReceivableMinimumDaysPastDueToStopAccrualOfInterest	P90D
CY2019	wfsl	Loans And Leases Receivable Loans Returned To Full Accrual Status LoansAndLeasesReceivableLoansReturnedToFullAccrualStatus	P90D
CY2019	wfsl	Loans Receivable Numberof Consecutive Payments Requiredto Return Loanto Accrual Status LoansReceivableNumberofConsecutivePaymentsRequiredtoReturnLoantoAccrualStatus	6	payment
CY2019	wfsl	Loans Receivable Numberof Consecutive Payments Requiredto Return Loanto Accrual Status LoansReceivableNumberofConsecutivePaymentsRequiredtoReturnLoantoAccrualStatus	6	payment
CY2019	wfsl	Allowancefor Loanand Lease Losses Numberof Partsin Loss Percentage Factor AllowanceforLoanandLeaseLossesNumberofPartsinLossPercentageFactor	2	part
CY2017Q3	us-gaap	Goodwill Goodwill	293153000	USD
CY2017Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5529000	USD
CY2017Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	298682000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	8215000	USD
CY2018	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	6595000	USD
CY2018	wfsl	Goodwill And Intangible Assets Acquired During Period GoodwillAndIntangibleAssetsAcquiredDuringPeriod	14810000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2206000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2206000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	301368000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	9918000	USD
CY2018Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	311286000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2019	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	0	USD
CY2019	wfsl	Goodwill And Intangible Assets Acquired During Period GoodwillAndIntangibleAssetsAcquiredDuringPeriod	0	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2039000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2039000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	301368000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7879000	USD
CY2019Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	309247000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1984000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1140000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	804000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	775000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	755000	USD
CY2019Q3	wfsl	Number Of Reportable Business Segments NumberOfReportableBusinessSegments	1	segment
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1458071000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	30461000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2790000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1485742000	USD
CY2019Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1443480000	USD
CY2018Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	76983000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1326471000	USD
CY2018Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1548770000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	4685000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	16199000	USD
CY2018Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1314957000	USD
CY2018Q3	wfsl	Available For Sale Securities Yield AvailableForSaleSecuritiesYield	0.0330
CY2018Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1625420000	USD
CY2018Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	333000	USD
CY2019Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	19952000	USD
CY2019Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	337000	USD
CY2019Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1463095000	USD
CY2019Q3	wfsl	Held To Maturity Securities Yield HeldToMaturitySecuritiesYield	0.0315
CY2019Q3	us-gaap	Investments Investments	2901551000	USD
CY2019Q3	wfsl	Gross Unrealized Gains On Investments GrossUnrealizedGainsOnInvestments	50413000	USD
CY2019Q3	wfsl	Gross Unrealized Losses On Investments GrossUnrealizedLossesOnInvestments	3127000	USD
CY2019Q3	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	2948837000	USD
CY2019Q3	wfsl	Yield Yield	0.0321
CY2018Q3	us-gaap	Investments Investments	2951891000	USD
CY2018Q3	wfsl	Gross Unrealized Gains On Investments GrossUnrealizedGainsOnInvestments	5018000	USD
CY2018Q3	wfsl	Gross Unrealized Losses On Investments GrossUnrealizedLossesOnInvestments	93182000	USD
CY2018Q3	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	2863727000	USD
CY2018Q3	wfsl	Yield Yield	0.0322
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	358709000	USD
CY2019	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	0	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	491000	USD
CY2019	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	0	USD
CY2019	wfsl	Term Of Contractual Due Dates Of Substantially All Mortgage Backed Securities TermOfContractualDueDatesOfSubstantiallyAllMortgageBackedSecurities	P25Y
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	804000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	240610000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	2323000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	373143000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	3127000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	613753000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	29854000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1124253000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	63328000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	1284504000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	93182000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	2408757000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	13312388000	USD
CY2019Q3	wfsl	Loans And Leases Receivable Ratio Of Loan Type To All Loans LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans	1
CY2018Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	12853678000	USD
CY2018Q3	wfsl	Loans And Leases Receivable Ratio Of Loan Type To All Loans LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans	1
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	131534000	USD
CY2018Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	129257000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Loans In Process LoansAndLeasesReceivableLoansInProcess	1201341000	USD
CY2018Q3	us-gaap	Loans And Leases Receivable Loans In Process LoansAndLeasesReceivableLoansInProcess	1195506000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	48938000	USD
CY2018Q3	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	51834000	USD
CY2019Q3	wfsl	Loans And Leases Receivable Charges To Allowance Loans In Process And Deferred Fees LoansAndLeasesReceivableChargesToAllowanceLoansInProcessAndDeferredFees	1381813000	USD
CY2018Q3	wfsl	Loans And Leases Receivable Charges To Allowance Loans In Process And Deferred Fees LoansAndLeasesReceivableChargesToAllowanceLoansInProcessAndDeferredFees	1376597000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	11930575000	USD
CY2018Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	11477081000	USD
CY2019Q3	us-gaap	Loans Receivable With Fixed Rates Of Interest1 LoansReceivableWithFixedRatesOfInterest1	8047602000	USD
CY2019Q3	wfsl	Loans Receivablewith Fixed Ratesof Interest Percentof Gross LoansReceivablewithFixedRatesofInterestPercentofGross	0.605
CY2019Q3	us-gaap	Loans Receivable With Variable Rates Of Interest1 LoansReceivableWithVariableRatesOfInterest1	5264786000	USD
CY2019Q3	wfsl	Loans Receivablewith Variable Ratesof Interest Percentof Gross LoansReceivablewithVariableRatesofInterestPercentofGross	0.395
CY2019Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	13312388000	USD
CY2019Q3	wfsl	Ratio Of Loans By Geographic Location To Total Loans RatioOfLoansByGeographicLocationToTotalLoans	1
CY2019Q3	wfsl	Recorded Investment In Impaired Loans RecordedInvestmentInImpairedLoans	149546000	USD
CY2018Q3	wfsl	Recorded Investment In Impaired Loans RecordedInvestmentInImpairedLoans	199545000	USD
CY2019	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	121677000	USD
CY2018	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	156858000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	439000	USD
CY2018Q3	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	517000	USD
CY2019	wfsl	Financing Receivable Average Balance Of Impaired Loans FinancingReceivableAverageBalanceOfImpairedLoans	175187000	USD
CY2018	wfsl	Financing Receivable Average Balance Of Impaired Loans FinancingReceivableAverageBalanceOfImpairedLoans	228398000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	7918000	USD
CY2018	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	10232000	USD
CY2019Q3	wfsl	Loans And Leases Receivable Loan Origination Commitments Outstanding LoansAndLeasesReceivableLoanOriginationCommitmentsOutstanding	357247000	USD
CY2018Q3	wfsl	Loans And Leases Receivable Loan Origination Commitments Outstanding LoansAndLeasesReceivableLoanOriginationCommitmentsOutstanding	400426000	USD
CY2019Q3	wfsl	Loans Serviced For Others LoansServicedForOthers	102282000	USD
CY2018Q3	wfsl	Loans Serviced For Others LoansServicedForOthers	77958000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	33731000	USD
CY2019Q3	wfsl	Loans And Leases Receivable Ratio Of Type Of Nonperforming Loans To All Nonperforming Loans LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans	1
CY2018Q3	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	55686000	USD
CY2018Q3	wfsl	Loans And Leases Receivable Ratio Of Type Of Nonperforming Loans To All Nonperforming Loans LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans	1
CY2019Q3	wfsl	Loansand Leases Receivable Nonperforming Nonaccrualof Interest Percentof Total Loans LoansandLeasesReceivableNonperformingNonaccrualofInterestPercentofTotalLoans	0.0028
CY2018Q3	wfsl	Loansand Leases Receivable Nonperforming Nonaccrualof Interest Percentof Total Loans LoansandLeasesReceivableNonperformingNonaccrualofInterestPercentofTotalLoans	0.0049
CY2019Q3	wfsl	Loans Receivable Netof Charge Offsand Loansin Process LoansReceivableNetofChargeOffsandLoansinProcess	12111047000	USD
CY2019Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	12075677000	USD
CY2019Q3	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	35370000	USD
CY2019Q3	wfsl	Loans And Leases Receivable Ratio Of Total Past Due Loans To Total Loans Receivable Net Of Charge Offs And Loans In Process LoansAndLeasesReceivableRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess	0.0029
CY2019Q3	wfsl	Financing Receivable Ratioof Total Past Due Loansto Total Loans Receivable Netof Charge Offsand Loansin Process Current FinancingReceivableRatioofTotalPastDueLoanstoTotalLoansReceivableNetofChargeOffsandLoansinProcessCurrent	0.9971
CY2019Q3	wfsl	Financing Receivable Ratioof Total Past Due Loansto Total Loans Receivable Netof Charge Offsand Loansin Process Past Due FinancingReceivableRatioofTotalPastDueLoanstoTotalLoansReceivableNetofChargeOffsandLoansinProcessPastDue	0.0029
CY2018Q3	wfsl	Loans Receivable Netof Charge Offsand Loansin Process LoansReceivableNetofChargeOffsandLoansinProcess	11658172000	USD
CY2018Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	11608959000	USD
CY2018Q3	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	49213000	USD
CY2018Q3	wfsl	Loans And Leases Receivable Ratio Of Total Past Due Loans To Total Loans Receivable Net Of Charge Offs And Loans In Process LoansAndLeasesReceivableRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess	0.0042
CY2018Q3	wfsl	Financing Receivable Ratioof Total Past Due Loansto Total Loans Receivable Netof Charge Offsand Loansin Process Current FinancingReceivableRatioofTotalPastDueLoanstoTotalLoansReceivableNetofChargeOffsandLoansinProcessCurrent	0.9958
CY2018Q3	wfsl	Financing Receivable Ratioof Total Past Due Loansto Total Loans Receivable Netof Charge Offsand Loansin Process Past Due FinancingReceivableRatioofTotalPastDueLoanstoTotalLoansReceivableNetofChargeOffsandLoansinProcessPastDue	0.0042
CY2019	wfsl	Loan Modification Basis Point Reduction Minimum LoanModificationBasisPointReductionMinimum	0.0100
CY2019	wfsl	Loan Modification Basis Point Reduction Maximum LoanModificationBasisPointReductionMaximum	0.0200
CY2019	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	121677000	USD
CY2018	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	156858000	USD
CY2019Q3	wfsl	Financing Receivable Impaired Troubled Debt Restructuring Percentof Restructured Loans Performing FinancingReceivableImpairedTroubledDebtRestructuringPercentofRestructuredLoansPerforming	0.959
CY2019Q3	wfsl	Single Family Residential Loans As Percentage Of Restructured Loans SingleFamilyResidentialLoansAsPercentageOfRestructuredLoans	0.920
CY2019	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	9	contract
CY2019	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1265000	USD
CY2019	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1265000	USD
CY2018	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	36	contract
CY2018	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	13131000	USD
CY2018	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	13131000	USD
CY2019	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	7	contract
CY2019Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	1546000	USD
CY2018	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	5	contract
CY2018Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	510000	USD
CY2018Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	129257000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	11476000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	15053000	USD
CY2019	wfsl	Financing Receivable Allowance For Credit Losses Provision And Transfers FinancingReceivableAllowanceForCreditLossesProvisionAndTransfers	-1300000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	131534000	USD
CY2017Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	123073000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	5932000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	16982000	USD
CY2018	wfsl	Financing Receivable Allowance For Credit Losses Provision And Transfers FinancingReceivableAllowanceForCreditLossesProvisionAndTransfers	-4866000	USD
CY2018Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	129257000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-1650000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-5450000	USD
CY2019	wfsl	Financing Receivable Allowance For Credit Losses Charge Offs Net Of Recoveries FinancingReceivableAllowanceForCreditLossesChargeOffsNetOfRecoveries	-3577000	USD
CY2018	wfsl	Financing Receivable Allowance For Credit Losses Charge Offs Net Of Recoveries FinancingReceivableAllowanceForCreditLossesChargeOffsNetOfRecoveries	-11050000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	13312388000	USD
CY2018Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	12853678000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	149546000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	164561000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2647000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	175187000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	439000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	2208000	USD
CY2018Q3	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	199545000	USD
CY2018Q3	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	214712000	USD
CY2018Q3	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	3388000	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	228398000	USD
CY2018Q3	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	517000	USD
CY2018Q3	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	2871000	USD
CY2019Q3	us-gaap	Hedged Liability Fair Value Hedge HedgedLiabilityFairValueHedge	1612208000	USD
CY2019Q3	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	-2680000	USD
CY2019	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	568096000	USD
CY2019	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	68190000	USD
CY2019	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
CY2019	wfsl	Revenue From Contract With Customer Percentage RevenueFromContractWithCustomerPercentage	0.050
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	4698000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4302000	USD
CY2019Q3	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	48857000	USD
CY2018Q3	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	47295000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	443837000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	416920000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	169822000	USD
CY2018Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	148925000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	274015000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	267995000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	5838000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5246000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3596000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	10531000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	6455000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	6477000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5500000	USD
CY2019Q3	us-gaap	Noninterest Bearing Domestic Deposit Checking NoninterestBearingDomesticDepositChecking	1621343000	USD
CY2019Q3	wfsl	Percentage Of Non Interest Bearing Domestic Deposits To Deposits Checking PercentageOfNonInterestBearingDomesticDepositsToDepositsChecking	0.135
CY2018Q3	us-gaap	Noninterest Bearing Domestic Deposit Checking NoninterestBearingDomesticDepositChecking	1401226000	USD
CY2018Q3	wfsl	Percentage Of Non Interest Bearing Domestic Deposits To Deposits Checking PercentageOfNonInterestBearingDomesticDepositsToDepositsChecking	0.124
CY2019Q3	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	1984576000	USD
CY2019Q3	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Checking PercentageOfInterestBearingDomesticDepositsToDepositsChecking	0.166
CY2018Q3	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	296238000	USD
CY2019Q3	us-gaap	Weighted Average Rate Domestic Deposit Checking WeightedAverageRateDomesticDepositChecking	0.0061
CY2018Q3	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	836501000	USD
CY2018Q3	us-gaap	Weighted Average Rate Domestic Deposit Checking WeightedAverageRateDomesticDepositChecking	0.0050
CY2019Q3	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	753574000	USD
CY2018Q3	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Savings PercentageOfInterestBearingDomesticDepositsToDepositsSavings	0.073
CY2019Q3	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Savings PercentageOfInterestBearingDomesticDepositsToDepositsSavings	0.063
CY2019Q3	us-gaap	Weighted Average Rate Domestic Deposit Savings WeightedAverageRateDomesticDepositSavings	0.0013
CY2018Q3	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	1778520000	USD
CY2018Q3	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Checking PercentageOfInterestBearingDomesticDepositsToDepositsChecking	0.156
CY2018Q3	us-gaap	Weighted Average Rate Domestic Deposit Savings WeightedAverageRateDomesticDepositSavings	0.0011
CY2019Q3	us-gaap	Deposits Deposits	11990764000	USD
CY2018Q3	wfsl	Time Deposits From Three Percentto Lessthan Four Percent TimeDepositsFromThreePercenttoLessthanFourPercent	0	USD
CY2018Q3	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	4804803000	USD
CY2018Q3	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Time Deposits PercentageOfInterestBearingDomesticDepositsToDepositsTimeDeposits	0.422
CY2018Q3	us-gaap	Weighted Average Rate Domestic Deposit Time Deposits WeightedAverageRateDomesticDepositTimeDeposits	0.0150
CY2019Q3	wfsl	Percentage Of Domestic Deposits To Deposits PercentageOfDomesticDepositsToDeposits	1
CY2019Q3	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0108
CY2018Q3	us-gaap	Deposits Deposits	11387146000	USD
CY2018Q3	wfsl	Percentage Of Domestic Deposits To Deposits PercentageOfDomesticDepositsToDeposits	1
CY2018Q3	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0087
CY2018Q3	wfsl	Time Deposits From Two Percentto Lessthan Three Percent TimeDepositsFromTwoPercenttoLessthanThreePercent	413671000	USD
CY2019Q3	wfsl	Time Deposits From Three Percentto Lessthan Four Percent TimeDepositsFromThreePercenttoLessthanFourPercent	2104000	USD
CY2019Q3	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	2724308000	USD
CY2019Q3	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Money Market PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket	0.227
CY2019Q3	us-gaap	Weighted Average Rate Domestic Deposit Money Market WeightedAverageRateDomesticDepositMoneyMarket	0.0082
CY2018Q3	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	2566096000	USD
CY2018Q3	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Money Market PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket	0.225
CY2018Q3	us-gaap	Weighted Average Rate Domestic Deposit Money Market WeightedAverageRateDomesticDepositMoneyMarket	0.0065
CY2019Q3	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	4906963000	USD
CY2019Q3	us-gaap	Percentage Of Interest Bearing Domestic Deposits To Deposits Time Deposits PercentageOfInterestBearingDomesticDepositsToDepositsTimeDeposits	0.409
CY2019Q3	us-gaap	Weighted Average Rate Domestic Deposit Time Deposits WeightedAverageRateDomesticDepositTimeDeposits	0.0191
CY2019Q3	wfsl	Time Deposits Lessthan One Percent TimeDepositsLessthanOnePercent	21281000	USD
CY2018Q3	wfsl	Time Deposits Lessthan One Percent TimeDepositsLessthanOnePercent	629589000	USD
CY2019Q3	wfsl	Time Deposits From One Percentto Lessthan Two Percent TimeDepositsFromOnePercenttoLessthanTwoPercent	3588689000	USD
CY2018Q3	wfsl	Time Deposits From One Percentto Lessthan Two Percent TimeDepositsFromOnePercenttoLessthanTwoPercent	3761543000	USD
CY2019Q3	wfsl	Time Deposits From Two Percentto Lessthan Three Percent TimeDepositsFromTwoPercenttoLessthanThreePercent	1294889000	USD
CY2019Q3	us-gaap	Time Deposits TimeDeposits	4906963000	USD
CY2018Q3	us-gaap	Time Deposits TimeDeposits	4804803000	USD
CY2019Q3	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	3489839000	USD
CY2018Q3	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	2800978000	USD
CY2019Q3	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	925170000	USD
CY2018Q3	wfsl	Time Deposit Maturities After Year3 TimeDepositMaturitiesAfterYear3	372345000	USD
CY2019Q3	us-gaap	Time Deposits TimeDeposits	4906963000	USD
CY2018Q3	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	1335242000	USD
CY2019Q3	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	294990000	USD
CY2019Q3	wfsl	Time Deposit Maturities After Year3 TimeDepositMaturitiesAfterYear3	196964000	USD
CY2019	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	980000	USD
CY2018	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	920000	USD
CY2017	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	978000	USD
CY2019	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	21967000	USD
CY2017	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	2721000	USD
CY2017Q3	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0054
CY2019	us-gaap	Weighted Average Rate Interest Bearing Domestic Deposits Over Time WeightedAverageRateInterestBearingDomesticDepositsOverTime	0.0105
CY2018	us-gaap	Weighted Average Rate Interest Bearing Domestic Deposits Over Time WeightedAverageRateInterestBearingDomesticDepositsOverTime	0.0065
CY2017	us-gaap	Weighted Average Rate Interest Bearing Domestic Deposits Over Time WeightedAverageRateInterestBearingDomesticDepositsOverTime	0.0049
CY2018Q3	us-gaap	Time Deposits TimeDeposits	4804803000	USD
CY2019Q3	wfsl	Customer Accounts Greater Than250000 CustomerAccountsGreaterThan250000	3609961000	USD
CY2018Q3	wfsl	Customer Accounts Greater Than250000 CustomerAccountsGreaterThan250000	3088231000	USD
CY2019	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	12499000	USD
CY2018	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	6072000	USD
CY2018	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	7788000	USD
CY2017	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	3592000	USD
CY2019	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	87665000	USD
CY2018	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	58468000	USD
CY2017	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	45256000	USD
CY2019	us-gaap	Interest Expense Deposits InterestExpenseDeposits	123111000	USD
CY2018	us-gaap	Interest Expense Deposits InterestExpenseDeposits	73248000	USD
CY2017	us-gaap	Interest Expense Deposits InterestExpenseDeposits	52547000	USD
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities Withdrawal Penalties InterestExpenseDomesticDepositLiabilitiesWithdrawalPenalties	895000	USD
CY2018	us-gaap	Interest Expense Domestic Deposit Liabilities Withdrawal Penalties InterestExpenseDomesticDepositLiabilitiesWithdrawalPenalties	756000	USD
CY2017	us-gaap	Interest Expense Domestic Deposit Liabilities Withdrawal Penalties InterestExpenseDomesticDepositLiabilitiesWithdrawalPenalties	524000	USD
CY2019	us-gaap	Interest Expense Customer Deposits InterestExpenseCustomerDeposits	122216000	USD
CY2018	us-gaap	Interest Expense Customer Deposits InterestExpenseCustomerDeposits	72492000	USD
CY2017	us-gaap	Interest Expense Customer Deposits InterestExpenseCustomerDeposits	52023000	USD
CY2019Q3	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0108
CY2018Q3	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0087
CY2019Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	950000000	USD
CY2018Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	1680000000	USD
CY2019Q3	wfsl	Federal Home Loan Bank Advances Maturities Summary Due From One Year To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneYearToThreeYearsOfBalanceSheetDate	750000000	USD
CY2018Q3	wfsl	Federal Home Loan Bank Advances Maturities Summary Due From One Year To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneYearToThreeYearsOfBalanceSheetDate	300000000	USD
CY2019Q3	wfsl	Federal Home Loan Bank Advances Maturities Summary Duefrom Three Yearsto Five Yearsof Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDuefromThreeYearstoFiveYearsofBalanceSheetDate	400000000	USD
CY2018Q3	wfsl	Federal Home Loan Bank Advances Maturities Summary Duefrom Three Yearsto Five Yearsof Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDuefromThreeYearstoFiveYearsofBalanceSheetDate	200000000	USD
CY2019Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due After Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate	150000000	USD
CY2018Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due After Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate	150000000	USD
CY2019Q3	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	2250000000	USD
CY2018Q3	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	2330000000	USD
CY2019Q3	us-gaap	Federal Home Loan Bank Advances Earlier Of Contractual Maturity Or Next Call Date In Next Rolling Twelve Months FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextCallDateInNextRollingTwelveMonths	100000000	USD
CY2019Q3	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0249
CY2018Q3	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0266
CY2017Q3	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0280
CY2019	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.0269
CY2018	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.0262
CY2017	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.0300
CY2019	wfsl	Federal Home Loan Bank Advances Activity For Year Daily Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearDailyAverageBalanceOfAgreementsOutstanding	2533890000	USD
CY2018	wfsl	Federal Home Loan Bank Advances Activity For Year Daily Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearDailyAverageBalanceOfAgreementsOutstanding	2384795000	USD
CY2017	wfsl	Federal Home Loan Bank Advances Activity For Year Daily Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearDailyAverageBalanceOfAgreementsOutstanding	2167986000	USD
CY2019Q3	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	2665000000	USD
CY2018Q3	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	2620000000	USD
CY2017Q3	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	2350000000	USD
CY2019	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	68190000	USD
CY2018	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	62452000	USD
CY2017	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	64969000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2453
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	50933000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	31494000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	31055000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	255000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	518000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	891000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	877000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	537000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1074000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	3022000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	3165000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1876000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1677000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2081000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1747000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	40156000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	40113000	USD
CY2019Q3	wfsl	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	14478000	USD
CY2018Q3	wfsl	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	14941000	USD
CY2019Q3	wfsl	Deferred Tax Liabilities Investmentsand Derivative Instruments DeferredTaxLiabilitiesInvestmentsandDerivativeInstruments	4503000	USD
CY2018Q3	wfsl	Deferred Tax Liabilities Investmentsand Derivative Instruments DeferredTaxLiabilitiesInvestmentsandDerivativeInstruments	2442000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	8385000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	9285000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	25399000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	23429000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2851000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1828000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	55616000	USD
CY2018Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	51925000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	15460000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	11812000	USD
CY2019Q3	wfsl	Current Tax Asset Liability CurrentTaxAssetLiability	10356000	USD
CY2018Q3	wfsl	Current Tax Asset Liability CurrentTaxAssetLiability	13616000	USD
CY2019Q3	wfsl	Income Tax Asset Liability Net IncomeTaxAssetLiabilityNet	-5104000	USD
CY2018Q3	wfsl	Income Tax Asset Liability Net IncomeTaxAssetLiabilityNet	1804000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	44557000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1586000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.02
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.03
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.04
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-116000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8836000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.01
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.25
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.02
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.02
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.04
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.20
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.21
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.32
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	46376000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-10111000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	92795000	USD
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	48292000	USD
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	49266000	USD
CY2017	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	77662000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4557000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4243000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4991000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-330000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	40314000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	87804000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1916000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	8952000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-10142000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	31000	USD
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	4227000	USD
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	4127000	USD
CY2017	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	5022000	USD
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	855000	USD
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CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	52519000	USD
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CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53393000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	82684000	USD
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	5000000	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2856502	shares
CY2018Q3	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	2679000	USD
CY2019	wfsl	Income Tax Examination Returns Opento Examination Maximum IncomeTaxExaminationReturnsOpentoExaminationMaximum	P5Y
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CY2019	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Amount DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount	55000	USD
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CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
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CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5910000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	6433000	USD
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CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	3136000	USD
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	27620	shares
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CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	17.17
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P1Y4M24D
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CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	27.21
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	27.96
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	320287	shares
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	521000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	0	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	0	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	5.21
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.15
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.06
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	414000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	908000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	2605000	USD
CY2019	wfsl	Share Based Compensation Arrangement By Share Based Payment Award Options Exercised Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedGrantDateFairValue	51000	USD
CY2018	wfsl	Share Based Compensation Arrangement By Share Based Payment Award Options Exercised Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedGrantDateFairValue	285000	USD
CY2017	wfsl	Share Based Compensation Arrangement By Share Based Payment Award Options Exercised Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedGrantDateFairValue	1328000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	298000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1338000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	7238000	USD
CY2018Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	0	shares
CY2018Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	0
CY2017Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	0	shares
CY2017Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	0
CY2016Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	0	shares
CY2016Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	0
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	0	shares
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	0
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	0	shares
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	0
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	0	shares
CY2018	us-gaap	Net Income Loss NetIncomeLoss	203850000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	173532000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80471316	shares
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	0
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	63176	shares
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue	5.33
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	0	shares
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue	0
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	0	shares
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue	0
CY2019Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	293167	shares
CY2019Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	5.33
CY2018Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	0	shares
CY2018Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	0
CY2017Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	0	shares
CY2017Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	0
CY2019	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	4065837	shares
CY2018	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	4868357	shares
CY2019Q3	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	7966761	shares
CY2019Q3	wfsl	Classof Warrantor Right Issued ClassofWarrantorRightIssued	1707456	shares
CY2019Q3	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	17.36
CY2019	wfsl	Classof Warrantor Right Repurchased During Period ClassofWarrantorRightRepurchasedDuringPeriod	102936	shares
CY2019	wfsl	Classof Warrantor Right Valueof Stock Issued Upon Exerciseof Warrants ClassofWarrantorRightValueofStockIssuedUponExerciseofWarrants	1081704	USD
CY2019Q3	us-gaap	Class Of Warrant Or Right Outstanding ClassOfWarrantOrRightOutstanding	0	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85008040	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	88905457	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80495163	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	85109843	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	89224207	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	210256000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.61
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.40
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.61
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.40
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.94
CY2018Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	162622000	USD
CY2019Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	167582000	USD
CY2019Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	171826000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	169436000	USD
CY2018Q4	us-gaap	Interest Expense InterestExpense	43470000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	47512000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	50160000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	49264000	USD
CY2018Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	119152000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	120070000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	121666000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	120172000	USD
CY2018Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-500000	USD
CY2019Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	750000	USD
CY2019Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
CY2019Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-1900000	USD
CY2018Q4	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	19329000	USD
CY2019Q1	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	13618000	USD
CY2019Q2	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	14395000	USD
CY2019Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	15786000	USD
CY2018Q4	us-gaap	Noninterest Expense NoninterestExpense	71672000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	67967000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	70898000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	72526000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	67309000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	64971000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	65163000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	65332000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14367000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	51098000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	53854000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13873000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11309000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12970000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	52942000	USD
CY2018Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.18
CY2019Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.20
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	52362000	USD
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.66
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.63
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.67
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2019Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.20
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.21
CY2017Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	145780000	USD
CY2018Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	149079000	USD
CY2018Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	155072000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	157152000	USD
CY2017Q4	us-gaap	Interest Expense InterestExpense	30045000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	31778000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	35220000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	37901000	USD
CY2017Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	115735000	USD
CY2018Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	117301000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	119852000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	119251000	USD
CY2017Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
CY2018Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-950000	USD
CY2018Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1000000	USD
CY2018Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-5500000	USD
CY2017Q4	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	6841000	USD
CY2018Q1	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	12309000	USD
CY2018Q2	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	12619000	USD
CY2018Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	12207000	USD
CY2017Q4	us-gaap	Noninterest Expense NoninterestExpense	61941000	USD
CY2018Q1	us-gaap	Noninterest Expense NoninterestExpense	65787000	USD
CY2018Q2	us-gaap	Noninterest Expense NoninterestExpense	66977000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	69617000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	60635000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	64773000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	64494000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	67341000	USD
CY2017Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8965000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15502000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13100000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15826000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	51670000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	49271000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	51394000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	51515000	USD
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.59
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.58
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.59
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.61
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2017Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.15
CY2018Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.17
CY2018Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.17
CY2018Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.18

Files In Submission

Name	View Source	Status
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$WAFD
WAFD INC Stock $wafd

2018 Q3 Form 10-K Financial Statement

#000093652819000052 Filed on November 20, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WAFD WAFD INC Stock $wafd

2018 Q3 Form 10-K Financial Statement

#000093652819000052 Filed on November 20, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WAFD
WAFD INC Stock $wafd