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Goodwill and Core Deposits and Other Intangibles | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Core Deposits and Other Intangibles | 6. Goodwill and Core Deposits and Other Intangibles Changes in the carrying amount and accumulated amortization of the Company’s goodwill and core deposits and other intangibles at March 31, 2024 and December 31, 2023, were as follows:
| March 31, 2024 |  | December 31, 2023
| (In thousands)
Goodwill |  |  |
Balance, beginning of period | $ | 1,398,253 |  |  | $ | 1,398,253 |
Acquisitions | — |  |  | — |
Balance, end of period | $ | 1,398,253 |  |  | $ | 1,398,253 |
| March 31, 2024 |  | December 31, 2023
| (In thousands)
Core Deposit Intangibles |  |  |
Balance, beginning of period | $ | 48,770 |  |  | $ | 58,455 |
Amortization expense | (2,140) |  |  | (2,477) |
Balance, March 31 | $ | 46,630 |  |  | 55,978 |
Amortization expense |  |  | (7,208) |
Balance, end of year |  |  | $ | 48,770 |
The carrying basis and accumulated amortization of core deposit intangibles at March 31, 2024 and December 31, 2023 were:
| March 31, 2024 |  | December 31, 2023
| (In thousands)
Gross carrying basis | $ | 128,888 |  |  | $ | 128,888 |
Accumulated amortization | (82,258) |  |  | (80,118) |
Net carrying amount | $ | 46,630 |  |  | $ | 48,770 |
Core deposit intangible amortization expense was approximately $2.1 million and $2.5 million for the three months ended March 31, 2024 and 2023, respectively. The Company’s estimated amortization expense of core deposits intangibles for each of the years 2024 through 2028 is approximately: 2024 – $8.4 million; 2025 – $8.0 million; 2026 – $7.8 million; 2027– $6.6 million; 2028 – $4.2 million. The carrying amount of the Company’s goodwill was $1.40 billion at both March 31, 2024 and December 31, 2023. Goodwill is tested annually for impairment during the fourth quarter or more often if events and circumstances indicate there may be an impairment. During the 2023 review, no impairment was found. If the implied fair value of goodwill is lower than its carrying amount, goodwill impairment is indicated, and goodwill is written down to its implied fair value. Subsequent increases in goodwill value are not recognized in the consolidated financial statements.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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