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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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