Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 18, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-13253
Entity Registrant Name	RENASANT CORP
Entity Incorporation, State or Country Code	MS
Entity Tax Identification Number	64-0676974
Entity Address, Address Line One	209 Troy Street,
Entity Address, City or Town	Tupelo,
Entity Address, State or Province	MS
Entity Address, Postal Zip Code	38804-4827
City Area Code	662
Local Phone Number	680-1001
Title of 12(b) Security	Common stock, $5.00 par value per share
Trading Symbol	RNST
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,196,590,080
Entity Common Stock, Shares Outstanding		55,815,152
Documents Incorporated by Reference	Portions of the Proxy Statement for the 2022 Annual Meeting of Shareholders of Renasant Corporation are incorporated by reference into Part III of this Form 10-K.
Entity Central Index Key	0000715072
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY