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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2021
Accounting Policies [Abstract] |
Schedule of goodwill and intangible assets | The table below provides detail regarding the Company's intangible assets.
| Goodwill |  | Core Deposit and Other Intangibles |  | Total
| (In thousands)
Balance at September 30, 2019 | $ | 301,368 |  |  | $ | 7,879 |  |  | $ | 309,247 |
Additions | 1,339 |  |  | 1,471 |  |  | 2,810 |
Amortization | — |  |  | (2,151) |  |  | (2,151) |
Balance at September 30, 2020 | 302,707 |  |  | 7,199 |  |  | 309,906 |
Additions | 750 |  |  | 750 |  |  | 1,500 |
Amortization | — |  |  | (1,387) |  |  | (1,387) |
Balance at September 30, 2021 | $ | 303,457 |  |  | $ | 6,562 |  |  | $ | 310,019 |
Schedule of future amortization expense | The table below presents the estimated future amortization expense of core deposit and other intangibles for the next five years.
Fiscal Year |  | Expense
|  | (In thousands)
2022 |  | $ | 1,012 |
2023 |  | 955 |
2024 |  | 921 |
2025 |  | 872 |
2026 |  | 829 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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