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Earnings Per Common Share - Additional Information (Detail) - USD ($) $ in Thousands				9 Months Ended
	Feb. 28, 2025	Feb. 27, 2025	Aug. 01, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan				16,000	0
Issuance of common stock				$ 159	$ 190,967
Common stock, shares outstanding				96,044,222		66,919,805
Premier Financial Corporation [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Issuance of common stock, net of issuance costs, shares	28,738,104	20,316,670	7,272,728
Issuance of common stock			$ 200,000
Common stock, shares outstanding	20,316,670
Premier Financial Corporation [Member] | Treasury stock [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Issuance of common stock, net of issuance costs, shares	8,421,434
Stock Option [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Securities excluded from computation of net income per diluted shares				422,836	472,401
Restricted Stock [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan				54,314	87,992

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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