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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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