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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 21, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description This Amendment No. 1 to the Annual Report on Form 10-K (this “Amendment”) amends the Annual Report on Form 10-K for the year ended December 31, 2022 (the “Original Form 10-K”), originally filed with the Securities and Exchange Commission on March 15, 2023, by Civista Bancshares, Inc. (the “Company”). The Company is filing this Amendment solely to correct an administrative error in the Report of Independent Registered Public Accounting Firm (the “Report”) included in Item 8, that resulted in the inadvertent omission of the Statement of Comprehensive Income (Loss) from the list of audited financial statements referred to in the Report. Except as described above, no other changes have been made to the Company’s financial statements or any other disclosure contained in the Original Form 10-K. The Original Form 10-K continues to speak as of the date of the Original Form 10-K, and the Company has not modified or updated the disclosures contained therein to reflect any events occurring after the filing of the Original Form 10-K. The Company has attached to this Amendment updated certifications executed as of the date of this Amendment as required by Rule 12b-15 of the Securities Exchange Act of 1934, as amended. The updated certifications are attached as Exhibits 31.1, 31.2, 32.1 and 32.2 to this Amendment. In addition, the Company has attached to this Amendment an updated Consent of FORVIS, LLP as Exhibit 23.1.    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Trading Symbol CIVB    
Entity Registrant Name Civista Bancshares, Inc.    
Entity Central Index Key 0000944745    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Incorporation, State or Country Code OH    
Entity File Number 001-36192    
Entity Tax Identification Number 34-1558688    
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 Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common shares, no par value    
Security Exchange Name NASDAQ    
Documents Incorporated by Reference

Portions of the registrant’s Annual Report to Shareholders for the fiscal year ended December 31, 2022 (the “2022 Annual Report”) are incorporated by reference into Parts I and II of this Form 10-K. Portions of the registrant’s Proxy Statement for the registrant’s 2023 Annual Meeting of Shareholders to be held on April 18, 2023 (the “2023 Proxy Statement”) are incorporated by reference into Part III of this Form 10-K.

    
Entity Common Stock, Shares Outstanding   15,722,614  
Entity Public Float     $ 296,180,043
Auditor Name FORVIS, LLP    
Auditor Firm ID 686    
Auditor Location Cincinnati, Ohio