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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		4 Months Ended	11 Months Ended
	Dec. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Nov. 30, 2024	Feb. 28, 2025
Intangible Assets Goodwill And Other Assets [Line Items]
Goodwill	$ 1,100,000,000	$ 1,600,000,000		$ 1,600,000,000
Other intangible assets	27,255,000	174,545,000		174,545,000
Amortization of core deposit and customer list intangible assets		4,200,000	$ 2,100,000
Goodwill, impairment loss	$ 0			0	$ 0
Premier Financial Corporation [Member]
Intangible Assets Goodwill And Other Assets [Line Items]
Goodwill		483,400,000		483,400,000		$ 483,397,000
Other intangible assets		$ 151,500,000		$ 151,500,000
Minimum [Member]
Intangible Assets Goodwill And Other Assets [Line Items]
Intangible asset, useful life		10 years		10 years
Maximum [Member]
Intangible Assets Goodwill And Other Assets [Line Items]
Intangible asset, useful life		16 years		16 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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The aggregate expense charged against earnings to allocate the cost of intangible core deposits and customer lists 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.

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Intangible assets goodwill and other assets.

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