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Goodwill and Core Deposits and Other Intangibles - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |
Core deposit and other intangible amortization | $ 2,095 | $ 2,253 | $ 2,477 | $ 6,375 | $ 7,432 |
Amortization expense for this year | 8,400 |  |  | 8,400 |  |
Amortization expense for year 1 | 8,000 |  |  | 8,000 |  |
Amortization expense for year 2 | 7,800 |  |  | 7,800 |  |
Amortization expense for year 3 | 6,600 |  |  | 6,600 |  |
Amortization expense for year 4 | 4,200 |  |  | 4,200 |  |
Carrying amount of Company's goodwill | $ 1,398,253 | $ 1,398,253 |  | $ 1,398,253 |  | $ 1,398,253

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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