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Document and Entity Information
Nov. 04, 2021
Cover [Abstract]  
Entity Registrant Name FIRST MERCHANTS CORP
Entity Incorporation State Country Code IN
Amendment Flag false
Entity Central Index Key 0000712534
Document Type 8-K
Document Period End Date Nov. 04, 2021
Entity Tax Identification Number 35-1544218
Entity Address, Address Line One 200 East Jackson Street
Entity Address, Address Line Two P.O. Box 792
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
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.125 stated value per share
Trading Symbol FRME
Security Exchange Name NASDAQ
Entity Emerging Growth Company false