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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 2020 and December 31, 2019 were as follows:
| September 30, |  | December 31,
(In thousands) | 2020 |  | 2019
Core deposit premiums: |  |  |
Balance, beginning of year | $ | 111,808 |  |  | $ | 79,807 |
Acquisitions(1) | — |  |  | 42,695 |
Disposition of intangible asset(2) | (2,324) |  |  | — |
Amortization | (9,114) |  |  | (10,694) |
Balance, end of period | 100,370 |  |  | 111,808 |
Books of business and other intangibles: |  |  |
Balance, beginning of year | 15,532 |  |  | 11,527 |
Acquisitions(3) | — |  |  | 5,116 |
Disposition of intangible asset | (413) |  |  | — |
Amortization | (1,029) |  |  | (1,111) |
Balance, end of period | 14,090 |  |  | 15,532 |
Total other intangible assets, net | $ | 114,460 |  |  | $ | 127,340 |
_________________________ (1) Core deposit premiums of $24.3 million and $18.4 million were recorded during 2019 as part of the Landrum and Reliance acquisitions, respectively. See Note 2, Acquisitions, for additional information on acquisitions completed in 2019. (2) Adjustments recorded for the premiums on certain deposit liabilities associated with the sale of the Texas Branches and Colorado Branches. (3) The Company recorded $5.1 million during 2019 primarily related to the wealth management operations acquired from Landrum. See Note 2, Acquisitions, for additional information on acquisitions completed in 2019. The carrying basis and accumulated amortization of the Company’s other intangible assets at September 30, 2020 and December 31, 2019 were as follows:
| September 30, |  | December 31,
(In thousands) | 2020 |  | 2019
Core deposit premiums: |  |  |
Gross carrying amount | $ | 146,355 |  |  | $ | 148,679 |
Accumulated amortization | (45,985) |  |  | (36,871) |
Core deposit premiums, net | 100,370 |  |  | 111,808 |
Books of business and other intangibles: |  |  |
Gross carrying amount | 19,938 |  |  | 20,350 |
Accumulated amortization | (5,848) |  |  | (4,818) |
Books of business and other intangibles, net | 14,090 |  |  | 15,532 |
Total other intangible assets, net | $ | 114,460 |  |  | $ | 127,340 |
Estimated Remaining Amortization Expense | The Company’s estimated remaining amortization expense on other intangible assets as of September 30, 2020 is as follows:
(In thousands) | Year |  | Amortization Expense
| Remainder of 2020 |  | $ | 3,351 |
| 2021 |  | 13,379 |
| 2022 |  | 13,327 |
| 2023 |  | 13,044 |
| 2024 |  | 12,141 |
| Thereafter |  | 59,218 |
| Total |  | $ | 114,460 |

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