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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangibles | Changes in the carrying amount and accumulated amortization of the Company’s core deposit premiums and other intangible assets at September 30, 2021 and December 31, 2020 were as follows:
| September 30, |  | December 31,
(In thousands) | 2021 |  | 2020
Core deposit premiums: |  |  |
Balance, beginning of year | $ | 97,363 |  |  | $ | 111,808 |
Disposition of intangible asset(1) | (674) |  |  | (2,324) |
Amortization | (8,978) |  |  | (12,121) |
Balance, end of period | 87,711 |  |  | 97,363 |
Books of business and other intangibles: |  |  |
Balance, beginning of year | 13,747 |  |  | 15,532 |
Disposition of intangible asset | — |  |  | (413) |
Amortization | (1,030) |  |  | (1,372) |
Balance, end of period | 12,717 |  |  | 13,747 |
Total other intangible assets, net | $ | 100,428 |  |  | $ | 111,110 |
_________________________ (1) Adjustments recorded for the premiums on certain deposit liabilities associated with the sale of banking operations. The carrying basis and accumulated amortization of the Company’s other intangible assets at September 30, 2021 and December 31, 2020 were as follows:
| September 30, |  | December 31,
(In thousands) | 2021 |  | 2020
Core deposit premiums: |  |  |
Gross carrying amount | $ | 144,202 |  |  | $ | 146,355 |
Accumulated amortization | (56,491) |  |  | (48,992) |
Core deposit premiums, net | 87,711 |  |  | 97,363 |
Books of business and other intangibles: |  |  |
Gross carrying amount | 19,937 |  |  | 19,937 |
Accumulated amortization | (7,220) |  |  | (6,190) |
Books of business and other intangibles, net | 12,717 |  |  | 13,747 |
Total other intangible assets, net | $ | 100,428 |  |  | $ | 111,110 |
Estimated Remaining Amortization Expense | The Company’s estimated remaining amortization expense on other intangible assets as of September 30, 2021 is as follows:
(In thousands) | Year |  | Amortization Expense
| Remainder of 2021 |  | $ | 3,332 |
| 2022 |  | 13,275 |
| 2023 |  | 12,992 |
| 2024 |  | 12,090 |
| 2025 |  | 9,505 |
| Thereafter |  | 49,234 |
| Total |  | $ | 100,428 |

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