XML 64 R1.htm IDEA: XBRL DOCUMENT v2.4.1.9
Document and Entity Information
 3 Months Ended
Mar. 31, 2015
May 07, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Trading Symbol civb  
Entity Registrant Name CIVISTA BANCSHARES, INC.  
Entity Central Index Key 0000944745  
Current Fiscal Year End Date --12-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   7,826,595dei_EntityCommonStockSharesOutstanding