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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 and December 31, 2022 were as follows:
| September 30, |  | December 31,
(In thousands) | 2023 |  | 2022
Core deposit premiums: |  |  |
Balance, beginning of year | $ | 116,016 |  |  | $ | 93,862 |
Acquisitions(1) | — |  |  | 36,500 |
Amortization | (11,066) |  |  | (14,346) |
Balance, end of period | 104,950 |  |  | 116,016 |
Books of business and other intangibles: |  |  |
Balance, beginning of year | 12,935 |  |  | 12,373 |
Acquisitions(2) | — |  |  | 2,131 |
Amortization | (1,225) |  |  | (1,569) |
Balance, end of period | 11,710 |  |  | 12,935 |
Total other intangible assets, net | $ | 116,660 |  |  | $ | 128,951 |
_________________________ (1) A core deposit premium of $36.5 million was recorded during 2022 as part of the Spirit acquisition. See Note 2, Acquisitions, for additional information. (2) The Company recorded $2.1 million during 2022 related to servicing assets acquired as part of the Spirit acquisition. See Note 2, Acquisitions, for additional information. The carrying basis and accumulated amortization of the Company’s other intangible assets at September 30, 2023 and December 31, 2022 were as follows:
| September 30, |  | December 31,
(In thousands) | 2023 |  | 2022
Core deposit premiums: |  |  |
Gross carrying amount | $ | 187,467 |  |  | $ | 189,996 |
Accumulated amortization | (82,517) |  |  | (73,980) |
Core deposit premiums, net | 104,950 |  |  | 116,016 |
Books of business and other intangibles: |  |  |
Gross carrying amount | 22,068 |  |  | 22,068 |
Accumulated amortization | (10,358) |  |  | (9,133) |
Books of business and other intangibles, net | 11,710 |  |  | 12,935 |
Total other intangible assets, net | $ | 116,660 |  |  | $ | 128,951 |
Estimated Remaining Amortization Expense | The Company’s estimated remaining amortization expense on other intangible assets as of September 30, 2023 is as follows:
(In thousands) | Year |  | Amortization Expense
| Remainder of 2023 |  | $ | 4,015 |
| 2024 |  | 15,403 |
| 2025 |  | 12,819 |
| 2026 |  | 12,346 |
| 2027 |  | 12,218 |
| Thereafter |  | 59,859 |
| Total |  | $ | 116,660 |

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