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Summary of Significant Accounting Policies - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2024 USD ($) | Feb. 08, 2021 USD ($) $ / shares shares | Mar. 31, 2024 USD ($) branch | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) portfolioSegment classOfPortfolioSegment branch | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of bank branches | branch |  |  | 210 |  | 210 |  |  |
Dividend rate |  | 4.875% |  |  |  |  |  |
Proceeds from issuance of preferred stock, net |  | $ 293,325,000 |  |  |  |  |  |
Cash collateral |  |  | $ 282,700,000 |  | $ 282,700,000 |  |  | $ 326,750,000
Fair value of NAV |  |  | 36,703,000 |  | 36,703,000 |  |  |
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 |  |  | 1,303,978,000 |  | $ 1,303,978,000 |  |  | 1,895,940,000
Goodwill |  |  | 411,401,000 |  | 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 | $ 105,836,000 |  |  |  |  |  |  |
Intangible assets | $ 37,022,000 |  |  |  |  |  |  |
Acquired intangible assets, useful life | 6 years |  |  |  |  |  |  |
Financing Receivable |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Loans in process |  |  | $ 3,859,416,000 |  | $ 3,859,416,000 |  |  | $ 3,625,333,000
Public Offering |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of depositary shares | shares |  | 12,000,000 |  |  |  |  |  |
Percentage of preferred stock |  | 2.50% |  |  |  |  |  |
Public offering price (in usd per share) | $ / shares |  | $ 25.00 |  |  |  |  |  |
Series A Preferred Stock | Public Offering |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of depositary shares | shares |  | 300,000 |  |  |  |  |  |

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