Earnings Per Common Share - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended
	Feb. 28, 2025	Feb. 27, 2025	Aug. 01, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 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						24,000	0
Issuance of common stock						$ 104
Common stock, shares outstanding				95,986,023		95,986,023		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				426,586	634,751	426,586	634,751
Restricted Stock [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan						46,407	104,594