Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 03, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	1-13006
Entity Registrant Name	PARK NATIONAL CORPORATION
Entity Address, State or Province	OH
Entity Tax Identification Number	31-1179518
Entity Address, Address Line One	50 North Third Street,
Entity Address, Address Line Two	P.O. Box 3500
Entity Address, City or Town	Newark,
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43058-3500
City Area Code	(740)
Local Phone Number	349-8451
Title of 12(b) Security	Common shares, without par value
Trading Symbol	PRK
Security Exchange Name	NYSEAMER
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		16,314,205
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000805676
Current Fiscal Year End Date	--12-31