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Business Combination - Narrative (Details) $ in Thousands	Mar. 01, 2024 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares) | shares	64,311,764	81,220,269	64,736,916
Goodwill		$ 411,360	$ 304,750	$ 303,457
Luther Burbank
Business Acquisition [Line Items]
Conversion ratio	0.3353
Number of WaFd shares issued to LBC shareholders | shares	17,088,886
Equity interest issued, percent of outstanding stock	21.00%
Goodwill	$ 104,707
Loans held for investment acquired	$ 3,200,000
Acquired intangible assets, useful life	6 years
Luther Burbank | PCD
Business Acquisition [Line Items]
Loans held for investment acquired	$ 293,204

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