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Goodwill and Core Deposit Intangible (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Changes in Carrying Amount and Accumulated Amortization of Company's Goodwill and Core Deposits and Other Intangibles | Changes in the carrying amount and accumulated amortization of the Company’s goodwill and core deposit intangible at December 31, 2023 and 2022, were as follows:
|  | December 31, 2023 |  | December 31, 2022
Goodwill |  | (In thousands)
Balance, beginning of period |  | $ | 1,398,253 |  |  | $ | 973,025 |
Acquisitions |  | — |  |  | 425,228 |
Balance, end of period |  | $ | 1,398,253 |  |  | $ | 1,398,253 |
|  | December 31, 2023 |  | December 31, 2022
Core Deposit Intangible |  | (In thousands)
Balance, beginning of period |  | $ | 58,455 |  |  | $ | 25,045 |
Acquisitions |  | — |  |  | 42,263 |
Amortization expense |  | (9,685) |  |  | (8,853) |
Balance, end of year |  | $ | 48,770 |  |  | $ | 58,455 |
Summary of Carrying Amount and Accumulated Amortization of Core Deposits and Other Intangibles | The carrying basis and accumulated amortization of core deposits intangibles at December 31, 2023 and 2022 were:
| December 31, 2023 |  | December 31, 2022
| (In thousands)
Gross carrying amount | $ | 128,888 |  |  | $ | 128,888 |
Accumulated amortization | (80,118) |  |  | (70,433) |
Net carrying amount | $ | 48,770 |  |  | $ | 58,455 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 + Details
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