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Business Combination - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Mar. 01, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | --- | ---
Fair value of liabilities assumed |  |  |  |
Goodwill | $ 411,360 |  | $ 304,750 | $ 303,457
Luther Burbank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total merger consideration |  | $ 465,504 |  |
Fair value of assets acquired |  |  |  |
Cash and cash equivalents |  | 627,403 |  |
Investment securities |  | 518,878 |  |
Loans receivable |  | 3,189,887 |  |
Loans held for sale |  | 3,017,506 |  |
Interest receivable |  | 25,697 |  |
Premises and equipment |  | 6,436 |  |
FHLB stock |  | 35,831 |  |
Bank owned life insurance |  | 17,781 |  |
Intangible assets |  | 37,022 |  |
Deferred tax asset, net |  | 125,151 |  |
Other assets |  | 75,585 |  |
Total assets acquired |  | 7,677,177 |  |
Fair value of liabilities assumed |  |  |  |
Customer accounts |  | 5,640,440 |  |
Accrued expenses and other liabilities |  | 100,113 |  |
Total liabilities assumed |  | 7,316,380 |  |
Net Assets Acquired |  | 360,797 |  |
Goodwill |  | 104,707 |  |
Luther Burbank | Borrowings |  |  |  |
Fair value of liabilities assumed |  |  |  |
Junior subordinated deferrable interest debentures |  | 1,432,138 |  |
Luther Burbank | Junior subordinated deferrable interest debentures |  |  |  |
Fair value of liabilities assumed |  |  |  |
Junior subordinated deferrable interest debentures |  | 50,175 |  |
Luther Burbank | Senior Debt |  |  |  |
Fair value of liabilities assumed |  |  |  |
Junior subordinated deferrable interest debentures |  | $ 93,514 |  |

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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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