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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
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 Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   56,562,634  
Entity Public Float     $ 2,019,319,054
Documents Incorporated by Reference
Portions of the Proxy Statement for the 2020 Annual Meeting of Shareholders of Renasant Corporation are incorporated by reference into Part III of this Form 10-K.
    
Document Annual Report true    
Document Transition Report false    
Entity Central Index Key 0000715072    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31