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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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