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Business Combination - Narrative (Details) $ in Thousands |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 01, 2024 USD ($) shares | Jun. 30, 2024 USD ($) shares | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) | shares | 64,000,000 | 81,157,173 |  |  | 64,736,916
Goodwill |  | $ 412,213 | $ 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 |  |  |  |
Equity interest issued, percent of outstanding stock | 21.00% |  |  |  |
Goodwill | $ 105,560 |  |  |  |
Goodwill adjustment, decrease |  | $ 276 |  |  |
Loans held for investment acquired | $ 3,100,000 |  |  |  |
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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