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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2022
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 March 31, 2022 and December 31, 2021 were as follows:
| March 31, |  | December 31,
(In thousands) | 2022 |  | 2021
Core deposit premiums: |  |  |
Balance, beginning of year | $ | 93,862 |  |  | $ | 97,363 |
Acquisitions(1) | — |  |  | 9,295 |
Disposition of intangible asset(2) | — |  |  | (674) |
Amortization | (3,144) |  |  | (12,122) |
Balance, end of period | 90,718 |  |  | 93,862 |
Books of business and other intangibles: |  |  |
Balance, beginning of year | 12,373 |  |  | 13,747 |
Amortization | (343) |  |  | (1,374) |
Balance, end of period | 12,030 |  |  | 12,373 |
Total other intangible assets, net | $ | 102,748 |  |  | $ | 106,235 |
_________________________ (1) Core deposit premiums of $5.1 million and $4.2 million were recorded during 2021 as part of the Triumph and Landmark acquisitions, respectively. See Note 2, Acquisitions, for additional information on acquisitions completed in 2021. (2) 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 March 31, 2022 and December 31, 2021 were as follows:
| March 31, |  | December 31,
(In thousands) | 2022 |  | 2021
Core deposit premiums: |  |  |
Gross carrying amount | $ | 153,496 |  |  | $ | 153,496 |
Accumulated amortization | (62,778) |  |  | (59,634) |
Core deposit premiums, net | 90,718 |  |  | 93,862 |
Books of business and other intangibles: |  |  |
Gross carrying amount | 19,937 |  |  | 19,937 |
Accumulated amortization | (7,907) |  |  | (7,564) |
Books of business and other intangibles, net | 12,030 |  |  | 12,373 |
Total other intangible assets, net | $ | 102,748 |  |  | $ | 106,235 |
Estimated Remaining Amortization Expense | The Company’s estimated remaining amortization expense on other intangible assets as of March 31, 2022 is as follows:
(In thousands) | Year |  | Amortization Expense
| Remainder of 2022 |  | $ | 10,408 |
| 2023 |  | 13,612 |
| 2024 |  | 12,709 |
| 2025 |  | 10,125 |
| 2026 |  | 9,652 |
| Thereafter |  | 46,242 |
| Total |  | $ | 102,748 |

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