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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2018
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, 2016 | $ | 291,503 |  |  | $ | 5,486 |  |  | $ | 296,989 |
Additions | 1,650 |  |  | 1,720 |  |  | 3,370 |
Amortization | — |  |  | (1,677 | ) |  | (1,677 | )
Balance at September 30, 2017 | 293,153 |  |  | 5,529 |  |  | 298,682 |
Additions (1) | 8,215 |  |  | 6,595 |  |  | 14,810 |
Amortization (2) | — |  |  | (2,206 | ) |  | (2,206 | )
Balance at September 30, 2018 | $ | 301,368 |  |  | $ | 9,918 |  |  | $ | 311,286 |
(1) During 2018, an immaterial correction was recorded related to acquisitions of insurance agency businesses in prior years. The balance sheet classification correction resulted in an increase in goodwill of $7,135,000 and finite-lived intangible assets of $5,106,000 and a corresponding decrease in other assets of $12,241,000. (2) During 2018, an immaterial correction of $1,500,000 was recorded to amortization expense for intangible assets stemming from acquisitions of insurance agency businesses in prior years.
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)
2019 |  | $ | 2,033 |
2020 |  | 1,990 |
2021 |  | 1,140 |
2022 |  | 804 |
2023 |  | 775 |

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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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