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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Mar. 31, 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, 2023 | $ | 304,750 |  |  | $ | 5,869 |  |  | $ | 310,619 |
Additions | 375 |  |  | 375 |  |  | 750 |
Amortization | — |  |  | (266) |  |  | (266) |
Balance at December 31, 2023 | 305,125 |  |  | 5,978 |  |  | 311,103 |
Additions | 106,276 |  |  | 37,462 |  |  | 143,738 |
Amortization | — |  |  | (1,302) |  |  | (1,302) |
Balance at March 31, 2024 | $ | 411,401 |  |  | $ | 42,138 |  |  | $ | 453,539 |
Schedule of Future Amortization Expense | The table below presents the estimated future amortization expense of other intangibles for the next five years as of March 31, 2024.
Fiscal Year |  | Expected Expense
|  | (In thousands)
2024 |  | $ | 6,155 |
2025 |  | 9,768 |
2026 |  | 7,217 |
2027 |  | 5,473 |
2028 |  | 5,111 |
Thereafter |  | 8,414 |
Total Intangibles Assets |  | $ | 42,138 |

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