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Summary of Significant Accounting Policies - Narrative (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 01, 2024 USD ($) | Feb. 08, 2021 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) classOfPortfolioSegment portfolioSegment branch segment payment | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Oct. 27, 2020 USD ($) | Oct. 09, 2013 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of offices | branch |  |  | 210 |  |  |  |
Dividend rate |  | 4.875% |  |  |  |  |
Proceeds from issuance of preferred stock, net |  | $ 293,325,000 |  |  |  |  |
Cash collateral |  |  | $ 168,200,000 | $ 326,750,000 |  |  |
Fair value of NAV |  |  | 36,317,000 |  |  |  |
Remaining unfunded commitment |  |  | $ 3,280,000 |  |  |  |
Days past grace period to initiate contact to cure deficiency |  |  | 30 days |  |  |  |
Minimum days past due to begin foreclosure proceedings |  |  | 90 days |  |  |  |
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 |  |  |  |
Minimum days past due to stop accrual of interest |  |  | 90 days |  |  |  |
Number of payments required | payment |  |  | 6 |  |  |  |
Goodwill |  |  | $ 411,360,000 | 304,750,000 | $ 303,457,000 |  |
Intangible asset impairment |  |  | $ 0 | $ 0 | $ 0 |  |
Weighted average remaining contractual term, exercisable |  |  | 5 years |  |  |  |
Number of reportable business segments | segment |  |  | 1 |  |  |  |
Civil money penalty from consent order issued |  |  |  |  |  | $ 200,000 | $ 34,000
Luther Burbank |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Goodwill | $ 104,707,000 |  |  |  |  |  |
Intangible assets | $ 37,022,000 |  |  |  |  |  |
Acquired intangible assets, useful life | 6 years |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |  |  |
Minimum | Stock Options and Restricted Stock |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 2 years |  |  |  |
Maximum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 5 years |  |  |  |
Weighted average remaining contractual term, exercisable |  |  | 10 years |  |  |  |
Maximum | Stock Options and Restricted Stock |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  |  | 5 years |  |  |  |
Public Offering |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | shares |  | 12,000,000 |  |  |  |  |
Percentage of preferred stock |  | 2.50% |  |  |  |  |
Public offering price (in dollars per share) | $ / shares |  | $ 25.00 |  |  |  |  |
Series A Preferred Stock | Public Offering |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | shares |  | 300,000 |  |  |  |  |

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