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Summary of Significant Accounting Policies - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2024 USD ($) | Jun. 30, 2024 USD ($) branch | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) branch portfolioSegment classOfPortfolioSegment | Jun. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of bank branches | branch |  | 210 |  | 210 |  |  |  |
Cash collateral |  | $ 276,450,000 |  | $ 276,450,000 |  |  |  | $ 326,750,000
Fair value of NAV |  | 37,057,000 |  | 37,057,000 |  |  |  |
Remaining unfunded commitment |  | 3,280,000 |  | $ 3,280,000 |  |  |  |
Number of portfolio segments for loans held for investment | portfolioSegment |  |  |  | 2 |  |  |  |
Number of classes disaggregating the commercial loan portfolio | classOfPortfolioSegment |  |  |  | 5 |  |  |  |
Number of classes disaggregating the consumer loan portfolio | classOfPortfolioSegment |  |  |  | 5 |  |  |  |
Loans in process |  | 1,094,956,000 |  | $ 1,094,956,000 |  |  |  | 1,895,940,000
Goodwill |  | 412,213,000 |  | 412,213,000 |  | $ 411,401,000 | $ 305,125,000 | $ 304,750,000
Goodwill and intangible asset impairment |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |
Luther Burbank |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 105,560,000 |  |  |  |  |  |  |
Intangible assets | $ 37,022,000 |  |  |  |  |  |  |
Acquired intangible assets, useful life | 6 years |  |  |  |  |  |  |

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