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Document and Entity Information - shares
9 Months Ended
Sep. 30, 2015
Nov. 09, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q3  
Trading Symbol HBNC  
Entity Registrant Name HORIZON BANCORP /IN/  
Entity Central Index Key 0000706129  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   11,932,887