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Cover Page - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Feb. 23, 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 0-17071    
Entity Registrant Name FIRST MERCHANTS CORPORATION    
Entity Incorporation, State or Country Code IN    
Entity Tax Identification Number 35-1544218    
Entity Address, Address Line One 200 East Jackson Street,    
Entity Address, City or Town Muncie    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 47305-2814    
City Area Code 765    
Local Phone Number 747-1500    
Title of 12(b) Security Common Stock, $0.125 stated value per share    
Trading Symbol FRME    
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     $ 2,249,029
Entity Common Stock, Shares Outstanding   53,820,946  
Documents Incorporated by Reference
DocumentsPart of Form 10-K into which incorporated
Portions of the Registrant’s DefinitivePart III (Items 10 through 14)
Proxy Statement for Annual Meeting of
Shareholders to be held May 10, 2022
    
Entity Central Index Key 0000712534    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY