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Goodwill and Core Deposits and Other Intangibles (Tables) | 3 Months Ended
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Mar. 31, 2024
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 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 |
Summary of Carrying Amount and Accumulated Amortization of Core Deposits and Other Intangibles | 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 |

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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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