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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 10 Months Ended | 11 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Nov. 30, 2024 | Jun. 30, 2025 | Feb. 28, 2025
Intangible Assets Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill | $ 1,100,000,000 | $ 1,600,000,000 |  | $ 1,600,000,000 |  | $ 1,600,000,000 |  |  |
Other intangible assets | 27,255,000 | 157,890,000 |  | 157,890,000 |  | 157,890,000 |  |  |
Amortization of core deposit and customer list intangible assets |  | 8,400,000 | $ 2,100,000 | 21,900,000 | $ 6,200,000 |  |  |  |
Goodwill, impairment loss | $ 0 |  |  |  |  | 0 | $ 0 |  |
Premier Financial Corporation [Member] |  |  |  |  |  |  |  |  |
Intangible Assets Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  | 481,422,000 |  | 481,422,000 |  | 481,422,000 |  | $ 476,175,000 | $ 481,422,000
Community Banking [Member] | Premier Financial Corporation [Member] |  |  |  |  |  |  |  |  |
Intangible Assets Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  | 481,400,000 |  | 481,400,000 |  | 481,400,000 |  |  |
Other intangible assets |  | 145,600,000 |  | 145,600,000 |  | 145,600,000 |  |  |
Trust and Investment Services [Member] | Premier Financial Corporation [Member] |  |  |  |  |  |  |  |  |
Intangible Assets Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Customer list intangibles |  | $ 6,900,000 |  | $ 6,900,000 |  | $ 6,900,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Intangible Assets Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible asset, useful life |  | 10 years |  | 10 years |  | 10 years |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Intangible Assets Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible asset, useful life |  | 16 years |  | 16 years |  | 16 years |  |  |

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483154/926-20-50-5 + Details
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