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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Mar. 04, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol PFC    
Entity Registrant Name PREMIER FINANCIAL CORP.    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Central Index Key 0000946647    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Tax Identification Number 34-1803915    
Entity File Number 0-26850    
Entity Incorporation, State or Country Code OH    
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 782-5015    
Security Exchange Name NASDAQ    
Title of 12(b) Security Common Stock, Par Value $0.01 Per Share    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Entity Common Stock, Shares Outstanding   37,273,303  
Entity Public Float     $ 648.8
Documents Incorporated by Reference

Documents Incorporated by Reference

Part III of this Form 10-K incorporates by reference certain information from the registrant’s definitive Proxy Statement for the 2021 Annual Meeting of the registrant’s shareholders.