XML 131 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Feb. 27, 2020
Jun. 28, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name HORIZON BANCORP INC /IN/    
Entity Central Index Key 0000706129    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Trading Symbol HBNC    
Entity Common Stock, Shares Outstanding   44,882,894  
Entity Public Float     $ 633.4
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Document Transition Report false    
Title of 12(b) Security Common stock    
Security Exchange Name NASDAQ    
Entity File Number 000-10792    
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    
Document Annual Report true