XML 79 R1.htm IDEA: XBRL DOCUMENT v3.19.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Nov. 07, 2019
Document And Entity Information [Line Items]    
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 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   15,479,257
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-36192  
Entity Tax Identification Number 34-1558688  
Entity Incorporation, State or Country Code OH  
Entity Address, Address Line One 100 East Water Street  
Entity Address, City or Town Sandusky  
Entity Address, State or Province OH  
Entity Address, Postal Zip Code 44870  
City Area Code 419  
Local Phone Number 625-4121  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Common [Member]    
Document And Entity Information [Line Items]    
Title of each class Common  
Trading Symbol CIVB  
Name of each exchange on which registered NASDAQ  
Preferred [Member]    
Document And Entity Information [Line Items]    
Title of each class Preferred  
Trading Symbol CIVBP  
Name of each exchange on which registered NASDAQ