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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 18, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
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 Proxy Statement for the registrant’s 2025 Annual Meeting of Shareholders to be held on April 15, 2025 (the “2025 Proxy Statement”) are incorporated by reference into Part III of this Form 10-K.

    
Entity Common Stock, Shares Outstanding   15,479,485  
Entity Public Float     $ 237,601,946
Auditor Name Plante & Moran, PLLC    
Auditor Firm ID 166    
Auditor Location Auburn Hills, Michigan    
Document Financial Statement Error Correction [Flag] true    
Document Financial Statement Restatement Recovery Analysis [Flag] false    
Auditor Opinion

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheet of Civista Bancshares, Inc. (the “Company”) as of December 31, 2024, the related consolidated statements of operations, comprehensive income (loss), changes in shareholders' equity, and cash flows for the year ended December 31, 2024, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024, and the results of its operations and its cash flows for the year ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”), and our report dated March 10, 2025 expressed an unqualified opinion thereon.