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Cover Page - shares
3 Months Ended
Mar. 31, 2020
May 04, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2020  
Document Transition Report false  
Entity File Number 0-17071  
Entity Registrant Name FIRST MERCHANTS CORP  
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 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   54,115,879
Entity Central Index Key 0000712534  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false