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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol Civb  
Entity Registrant Name CIVISTA BANCSHARES, INC.  
Entity Central Index Key 0000944745  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   15,650,082
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-36192  
Entity Tax Identification Number 341558688  
Entity Address, Address Line One 100 East Water Street  
Entity Address, City or Town Sandusky  
Entity Address, State or Province Ohio  
Entity Address, Postal Zip Code 44870  
City Area Code 419  
Local Phone Number 625-4121