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Cover Page - shares
 9 Months Ended
Sep. 30, 2019
Nov. 06, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Entity Registrant Name HORIZON BANCORP INC /IN/  
Entity Central Index Key 0000706129  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Trading Symbol HBNC  
Entity Common Stock, Shares Outstanding   44,969,771
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Document Quarterly Report true  
Document Transition Report false  
Title of 12(b) Security Common stock  
Security Exchange Name NASDAQ  
Entity File Number 0-10792  
Entity Incorporation, State or Country Code IN  
Entity Tax Identification Number 35-1562417  
Entity Address, Address Line One 515 Franklin Street  
Entity Address, City or Town Michigan City  
Entity Address, State or Province IN  
Entity Address, Postal Zip Code 46360  
City Area Code 219  
Local Phone Number 879-0211