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BUSINESS COMBINATION - Narrative (Details) $ in Thousands	Mar. 01, 2024 USD ($) shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)
Business Combination [Line Items]
Common stock, shares outstanding (in shares) | shares	64,311,764	78,186,520	81,220,269
Goodwill		$ 414,722	$ 411,360	$ 304,750
Luther Burbank
Business Combination [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	$ 107,890
Loans held for investment acquired	$ 3,200,000
Acquired intangible assets, useful life	6 years
Luther Burbank | PCD
Business Combination [Line Items]
Loans held for investment acquired	$ 293,204

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