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Goodwill and Core Deposits and Other Intangibles (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2024 and December 31, 2023, were as follows:
| September 30, 2024 |  | December 31, 2023
| (In thousands)
Goodwill |  |  |
Balance, beginning of period | $ | 1,398,253 |  |  | $ | 1,398,253 |
Balance, end of period | $ | 1,398,253 |  |  | $ | 1,398,253 |
| September 30, 2024 |  | December 31, 2023
| (In thousands)
Core Deposit Intangibles |  |  |
Balance, beginning of period | $ | 48,770 |  |  | $ | 58,455 |
Amortization expense | (6,375) |  |  | (7,432) |
Balance, September 30 | $ | 42,395 |  |  | 51,023 |
Amortization expense |  |  | (2,253) |
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 September 30, 2024 and December 31, 2023 were:
| September 30, 2024 |  | December 31, 2023
| (In thousands)
Gross carrying basis | $ | 128,888 |  |  | $ | 128,888 |
Accumulated amortization | (86,493) |  |  | (80,118) |
Net carrying amount | $ | 42,395 |  |  | $ | 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://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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