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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2024
Accounting Policies [Abstract] |
Schedule of Intangible Assets and Goodwill | The table below provides detail regarding the Company's intangible assets.
| Goodwill |  | Core Deposit and Other Intangibles |  | Total
| (In thousands)
Balance at September 30, 2022 | $ | 303,457 |  |  | $ | 5,552 |  |  | $ | 309,009 |
Additions | 1,293 |  |  | 1,297 |  |  | 2,590 |
Amortization | — |  |  | (980) |  |  | (980) |
Balance at September 30, 2023 | 304,750 |  |  | 5,869 |  |  | 310,619 |
Additions | 106,610 |  |  | 38,939 |  |  | 145,549 |
Amortization | — |  |  | (7,743) |  |  | (7,743) |
Balance at September 30, 2024 | $ | 411,360 |  |  | $ | 37,065 |  |  | $ | 448,425 |
Schedule of Future Amortization Expense | The table below presents the estimated future amortization expense of other intangibles for the next five years.
Fiscal Year |  | Expense
|  | (In thousands)
2025 |  | $ | 9,862 |
2026 |  | 7,317 |
2027 |  | 5,567 |
2028 |  | 5,205 |
2029 |  | 5,112 |

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