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Business Combination - Narrative (Details) $ in Thousands	Mar. 01, 2024 USD ($) shares	Mar. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($) shares
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares) | shares	64,000,000	81,405,391		64,736,916
Goodwill		$ 411,401	$ 305,125	$ 304,750
Luther Burbank
Business Acquisition [Line Items]
Conversion ratio	0.3353
Number of WaFd shares issued to LBC shareholders | shares	17,089,000
Goodwill	$ 105,836
Loans held for investment acquired	3,200,000
Luther Burbank | PCD
Business Acquisition [Line Items]
Loans held for investment acquired	$ 293,204

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