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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net income | $ 162,935,000 | $ 131,244,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation, amortization, accretion and other, net | 47,398,000 | 26,329,000
Stock-based compensation expense | 5,316,000 | 4,916,000
Provision (release) for credit losses | 1,500,000 | 1,000,000
Loss (gain) on sale of investment securities | (81,000) | 0
Net realized (gain) loss on sales of premises, equipment, and real estate owned | (516,000) | (104,000)
Impairment loss on premises and equipment | 0 | 574,000
Prepayment penalty from repayment of borrowings | 0 | 13,788,000
Gain on early termination of long term borrowing hedge | 0 | (14,110,000)
Decrease (increase) in accrued interest receivable | (5,349,000) | 2,255,000
Decrease (increase) in federal and state income tax receivable | 3,877,000 | 5,708,000
Decrease (increase) in cash surrender value of bank owned life insurance | (4,144,000) | (4,133,000)
Decrease (increase) in other assets | (60,525,000) | 153,610,000
Increase (decrease) in federal and state income tax liabilities | 8,950,000 | (13,470,000)
Increase (decrease) in accrued expenses and other liabilities | 12,046,000 | (57,910,000)
Net cash provided by (used in) operating activities | 171,407,000 | 249,697,000
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Origination of loans and principal repayments, net | (1,186,189,000) | (266,566,000)
Loans purchased | (576,697,000) | (412,423,000)
FHLB & FRB stock purchased | (170,000,000) | (244,035,000)
FHLB & FRB stock redeemed | 194,790,000 | 274,000,000
Available-for-sale securities purchased | (516,163,000) | (528,937,000)
Principal payments and maturities of available-for-sale securities | 384,111,000 | 493,520,000
Proceeds from sales of available-for-sale securities | 4,510,000 | 0
Held-to-maturity securities purchased | (195,358,000) | 0
Principal payments and maturities of held-to-maturity securities | 81,497,000 | 283,458,000
Proceeds from sales of real estate owned | 5,280,000 | 2,089,000
Proceeds from sales of premises and equipment | 41,000 | 3,376,000
Premises and equipment purchased and REO improvements | (8,712,000) | (24,758,000)
Net cash provided by (used in) investing activities | (1,982,890,000) | (420,276,000)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Net increase (decrease) in customer accounts | 423,508,000 | 1,458,734,000
Proceeds from borrowings | 4,250,000,000 | 6,100,000,000
Repayments of borrowings | (4,270,000,000) | (6,863,788,000)
Proceeds from the early termination of long term borrowing hedge | 0 | 14,110,000
Proceeds from stock-based awards | 1,548,000 | 339,000
Proceeds from issuance of preferred stock, net | 0 | 293,325,000
Dividends paid on common stock | (46,015,000) | (50,431,000)
Dividends paid on preferred stock | (10,969,000) | (2,722,000)
Treasury stock purchased | (3,212,000) | (208,075,000)
Increase (decrease) in advances payments by borrowers for taxes and insurance | (16,765,000) | (21,932,000)
Net cash provided by (used in) financing activities | 328,095,000 | 719,560,000
Increase (decrease) in cash and cash equivalents | (1,483,388,000) | 548,981,000
Cash, cash equivalents and restricted cash at beginning of period | 2,090,809,000 | 1,702,977,000
Cash, cash equivalents and restricted cash at end of period | 607,421,000 | 2,251,958,000
Non-cash investing activities |  |
Real estate acquired through foreclosure | 73,000 | 175,000
Other personal property acquired through foreclosure | 422,000 | 0
Non-cash financing activities |  |
Preferred stock dividend payable | 3,656,000 | 3,656,000
Cash paid (received) during the period for |  |
Interest | 40,196,000 | 57,189,000
Income taxes | $ 19,257,000 | $ 31,154,000

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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans Originated Net of Principal Collections + References No definition available. + Details
Name: | wfsl_LoansOriginatedNetOfPrincipalCollections
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of non-covered real estate investments acquired through foreclosure during the period. Title through foreclosure occurs in a legal proceeding in which a secured creditor obtains title typically be bidding the amount of debt owed to it after the borrower has defaulted on the debt instrument. + References No definition available. + Details
Name: | wfsl_NonCoveredRealEstateAcquiredThroughForeclosure
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Noncash Financing Items [Abstract] + References No definition available. + Details
Name: | wfsl_NoncashFinancingItemsAbstract
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Noncash​ Investing Items​ [Abstract] + References No definition available. + Details
Name: | wfsl_NoncashInvestingItemsAbstract
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Premises and Equipment Purchased and REO Improvements + References No definition available. + Details
Name: | wfsl_PremisesAndEquipmentPurchasedAndReoImprovements
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration