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Goodwill and Core Deposits and Other Intangibles (Tables) | 3 Months Ended
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Mar. 31, 2025
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, 2025 and December 31, 2024, were as follows:
| March 31, 2025 |  | December 31, 2024
| (In thousands)
Goodwill |  |  |
Balance, beginning of period | $ | 1,398,253 |  |  | $ | 1,398,253 |
Balance, end of period | $ | 1,398,253 |  |  | $ | 1,398,253 |
| March 31, 2025 |  | December 31, 2024
| (In thousands)
Core Deposit Intangibles |  |  |
Balance, beginning of period, January 1 | $ | 40,327 |  |  | $ | 48,770 |
Amortization expense | (2,047) |  |  | (2,140) |
Balance, March 31 | $ | 38,280 |  |  | 46,630 |
Amortization expense |  |  | (6,303) |
Balance, end of year |  |  | $ | 40,327 |
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, 2025 and December 31, 2024 were:
| March 31, 2025 |  | December 31, 2024
| (In thousands)
Gross carrying basis | $ | 128,888 |  |  | $ | 128,888 |
Accumulated amortization | (90,608) |  |  | (88,561) |
Net carrying amount | $ | 38,280 |  |  | $ | 40,327 |

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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://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -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://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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