Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Nov. 01, 2022
Cover [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2022
Entity Registrant Name	Premier Financial Corp.
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		35,566,382
Entity Central Index Key	0000946647
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false
Trading Symbol	PFC
City Area Code	419
Title of 12(b) Security	Common Stock, Par Value $0.01 Per Share
Security Exchange Name	NASDAQ
Document Quarterly Report	true
Document Transition Report	false
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
Entity File Number	0-26850
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	34-1803915
Local Phone Number	785-8700