| Document And Entity Information | Jul. 25, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 25, 2023 |
| Entity Registrant Name | Premier Financial Corp. |
| Entity Central Index Key | 0000946647 |
| Entity Emerging Growth Company | false |
| Securities Act File Number | 0-26850 |
| Entity Incorporation, State or Country Code | OH |
| Entity Tax Identification Number | 34-1803915 |
| Entity Address, Address Line One | 601 Clinton Street |
| Entity Address, City or Town | Defiance |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 43512 |
| City Area Code | 419 |
| Local Phone Number | 785-8700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, Par Value $0.01 Per Share |
| Trading Symbol | PFC |
| Security Exchange Name | NASDAQ |
