Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	HANCOCK WHITNEY CORP
Entity Filer Category	Large Accelerated Filer
Entity Central Index Key	0000750577
Trading Symbol	HWC
Amendment Flag	false
Document Type	10-Q
Document Fiscal Period Focus	Q2
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity File Number	001-36872
Entity Tax Identification Number	640693170
Entity Address, Address Line One	Hancock Whitney Plaza
Entity Address, Address Line Two	2510 14th Street
Entity Address, City or Town	Gulfport
Entity Address, State or Province	Mississippi
Entity Address, Postal Zip Code	39501
City Area Code	(228)
Local Phone Number	868-4000
Entity Common Stock, Shares Outstanding		85,769,278