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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income | $ 257,426,000 | $ 236,330,000 | $ 183,615,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation, amortization, accretion and other, net | 22,970,000 | 64,050,000 | 33,914,000
Stock-based compensation expense | 7,914,000 | 6,808,000 | 6,381,000
Provision (release) for credit losses | 41,500,000 | 3,000,000 | 500,000
Loss (gain) on sale of investment securities | (33,000) | (99,000) | (14,000)
Prepayment penalty on early extinguishment of debt | 0 | 0 | 13,788,000
Gain on early termination of long term borrowing hedge | 0 | 0 | (14,110,000)
Gain on settlements of bank owned life insurance | (821,000) | (1,385,000) | 0
Impairment loss on premises and equipment | 6,000 | 0 | 944,000
Net realized (gain) loss on sales of premises, equipment and real estate owned | (1,153,000) | 655,000 | (593,000)
Decrease (increase) in accrued interest receivable | (23,131,000) | (13,236,000) | 3,163,000
Decrease (increase) in federal and state income tax receivable | (6,650,000) | 3,877,000 | 1,831,000
Decrease (increase) in cash surrender value of bank owned life insurance | (5,976,000) | (5,549,000) | (5,514,000)
Decrease (increase) in other assets | (67,342,000) | (100,146,000) | 155,599,000
Increase (decrease) in federal and state income tax liabilities | (3,306,000) | 8,386,000 | (15,781,000)
Increase (decrease) in accrued expenses and other liabilities | (7,447,000) | 65,774,000 | (49,269,000)
Net cash provided (used) by operating activities | 213,957,000 | 268,465,000 | 314,454,000
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Origination of loans and principal repayments, net | (1,330,399,000) | (1,748,955,000) | (556,274,000)
Loans purchased | (79,965,000) | (576,697,000) | (488,147,000)
FHLB & FRB stock purchase | (654,805,000) | (293,800,000) | (296,073,000)
FHLB & FRB stock redeemed | 623,058,000 | 301,590,000 | 335,200,000
Available-for-sale securities purchased | (376,481,000) | (587,942,000) | (530,227,000)
Principal payments and maturities of available-for-sale securities | 420,154,000 | 510,156,000 | 646,532,000
Proceeds from sales of available-for-sale investment securities | 1,169,000 | 5,020,000 | 1,499,000
Held-to-maturity securities purchased | 0 | (195,357,000) | 0
Principal payments and maturities of held-to-maturity securities | 39,414,000 | 95,326,000 | 332,001,000
Proceeds from sales of real estate owned | 7,192,000 | 6,978,000 | 3,340,000
Proceeds from settlements of bank owned life insurance | 1,809,000 | 2,266,000 | 0
Purchase of strategic investments | (12,500,000) | 0 | 0
Net cash received (paid) in business combinations | (2,590,000) | 0 | (1,500,000)
Proceeds from sales of premises and equipment | 1,090,000 | 41,000 | 3,376,000
Premises and equipment purchased and REO improvements | (15,063,000) | (11,790,000) | (29,472,000)
Net cash provided (used) by investing activities | (1,377,917,000) | (2,493,164,000) | (579,745,000)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Net increase (decrease) in customer accounts | 40,759,000 | 487,458,000 | 1,762,488,000
Proceeds from borrowings | 17,175,000,000 | 7,345,000,000 | 7,400,000,000
Repayments of borrowings | (15,650,000,000) | (6,940,000,000) | (8,393,788,000)
Proceeds from the early termination of long term borrowing hedge | 0 | 0 | 14,110,000
Proceeds from stock-based awards | 1,089,000 | 1,823,000 | 339,000
Proceeds from issuance of preferred stock, net | 0 | 0 | 293,325,000
Dividends paid on common stock | (63,792,000) | (61,576,000) | (65,876,000)
Dividends paid on preferred stock | (14,625,000) | (14,625,000) | (6,378,000)
Proceeds from employee stock purchase | 177,000 | 0 | 0
Treasury stock purchased | (30,463,000) | (3,260,000) | (348,651,000)
Increase (decrease) in advance payments by borrowers for taxes and insurance | 2,499,000 | 3,035,000 | (2,446,000)
Net cash provided (used) by financing activities | 1,460,644,000 | 817,855,000 | 653,123,000
Increase (decrease) in cash and cash equivalents | 296,684,000 | (1,406,844,000) | 387,832,000
Cash and cash equivalents at beginning of year | 683,965,000 | 2,090,809,000 | 1,702,977,000
Cash and cash equivalents at end of year | 980,649,000 | 683,965,000 | 2,090,809,000
Non-cash investing activities |  |  |
Real estate acquired through foreclosure | 121,000 | 73,000 | 221,000
Other personal property acquired through foreclosure | 0 | 577,000 | 0
Non-cash financing activities |  |  |
Preferred stock dividend payable | 3,656,000 | 3,656,000 | 3,656,000
Cash paid during the year for |  |  |
Interest | 364,386,000 | 65,175,000 | 71,845,000
Income taxes | $ 61,245,000 | $ 35,098,000 | $ 47,854,000

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- Definition The aggregate amount of recurring non-cash expense charged against earnings in the period for net deferred loan fees, discounts/premiums of investments and to allocate the cost of intangible assets over their estimated remaining economic lives. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cash Flow, Noncash Investing Disclosure [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Cash Paid During Period For [Abstract] + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Covered Real Estate Owned Purchased + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain (Loss) on Settlements of Bank Owned Life Insurance + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gain on Termination of Long Term Borrowing Hedge + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- 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
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Non-cash Financing Activities [Abstract] + References No definition available. + Details
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Namespace Prefix: | wfsl_
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Balance Type: | na
Period Type: | duration

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- Definition Payments To Acquire Equity Securities + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payments To Acquire Federal Home Loan Bank And Federal Reserve Bank Stock + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Proceeds From Sale Of Federal Home Loan Bank And Federal Reserve Bank Stock + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Proceeds from Termination of Hedge, Financing Activities + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration