Consolidated Financial Statements	9 Months Ended
Consolidated Financial Statements	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidated Financial Statements	(1) Consolidated Financial Statements Nature of Operations and Principles of Consolidation: Civista Bancshares, Inc. ("CBI") is an Ohio corporation and a registered financial holding company. The Consolidated Financial Statements include the accounts of CBI and its wholly-owned direct and indirect subsidiaries: Civista Bank ("Civista"), First Citizens Insurance Agency, Inc. ("FCIA"), Water Street Properties, Inc. ("WSP"), CIVB Risk Management, Inc. ("CRMI") and First Citizens Investments, Inc. ("FCI"). The above companies together are sometimes referred to as the "Company". Intercompany balances and transactions are eliminated in consolidation. Management considers the Company to operate primarily in one reportable segment, banking. Civista provides financial services through its offices in the Ohio counties of Erie, Crawford, Champaign, Cuyahoga, Franklin, Logan, Summit, Huron, Ottawa, Madison, Montgomery, Henry, Wood, and Richland, in the Indiana counties of Dearborn and Ripley, and in the Kentucky county of Kenton. Its primary deposit products are checking, savings, and term certificate accounts, and its primary lending products are residential mortgage, commercial, and installment loans. Substantially all loans are secured by specific items of collateral including business assets, consumer assets and commercial and residential real estate. Commercial loans are expected to be repaid from cash flow from operations of businesses. There are no significant concentrations of loans to any one industry or customer. However, our customers’ ability to repay their loans is dependent on the real estate and general economic conditions in the area. Other financial instruments that potentially represent concentrations of credit risk include deposit accounts in other financial institutions. Civista Leasing and Finance ("CLF"), formerly known as Vision Financial Group, Inc. ("VFG"), was acquired in the fourth quarter of 2022 as a wholly-owned subsidiary of Civista. As of August 31, 2023, VFG was merged into Civista and now operates as a full-service equipment leasing and financing division of Civista. The operations of CLF are headquartered in Pittsburgh, Pennsylvania. FCIA is wholly-owned by CBI and was formed to allow CBI and its subsidiaries to participate in commission revenue generated through CBI's third-party insurance agreement. FCIA revenue was less than 1% of total revenue for each of the quarters ended September 30, 2025 and 2024. WSP is wholly-owned by CBI and was formed to hold properties repossessed by CBI subsidiaries. WSP revenue was less than 1% of total revenue for each of the quarters ended September 30, 2025 and 2024. CRMI is a captive insurance company that is wholly-owned by CBI and was formed in 2017 to provide property and casualty insurance coverage to CBI and its subsidiaries for which insurance may not be currently available or economically feasible in the insurance marketplace. CRMI revenue was less than 1% of total revenue for each of the quarters ended September 30, 2025 and 2024. FCI is wholly-owned by Civista and holds and manages its securities portfolio. The operations of FCI are located in Wilmington, Delaware. Agreement and Plan of Merger with The Farmers Savings Bank On July 10, 2025, CBI and Civista entered into an Agreement and Plan of Merger (the “Merger Agreement”) with The Farmers Savings Bank, an Ohio-chartered bank headquartered in Spencer, Ohio (“Farmers”). Upon the terms and subject to the conditions of the Merger Agreement, at the effective time of the merger (the “Effective Time”), Farmers will merge with and into Civista, with Civista being the surviving bank in the merger (the “FSB Merger”). The acquisition of Farmers will add two branches in Medina and Lorain Counties in Northeast Ohio. As of September 30, 2025, Farmers reported total assets of $293 million, net loans of $106 million, and total deposits of $236 million. Under the terms and subject to the conditions of the Merger Agreement, which has been unanimously approved by the Boards of Directors of both companies, CBI agreed to pay $34.925 million in cash and issue 1,434,491 common shares, in aggregate, for all of the outstanding Farmers shares, subject to potential adjustment based on Farmers’ equity prior to closing being $56.0 million. This implies an aggregate deal value of approximately $66.7 million based on the closing price of CBI’s common shares on October 24, 2025 of $22.18. Civista has received all required regulatory approvals for the FSB merger, which is expected to close in November 2025, pending approval by Farmer's shareholders and satisfaction of other customary closing conditions. Offering of Common Shares On July 10, 2025, CBI announced an underwritten public offering of up to a maximum of 3,788,238 of its common shares. CBI subsequently closed on the sale of 3,294,120 common shares on July 14, 2025, and the sale of an additional 494,118 common shares on July 16, 2025 pursuant to the underwriters’ exercise of their overallotment option, at the public offering price of $21.25 per share. The aggregate net proceeds from the Offering to CBI were approximately $75.7 million, after deducting $608 of direct expenses and the underwriting discount of $4.2 million. As of September 30, 2025, the net proceeds from the offering was used to pay-down short-term FHLB advances, but the long-term strategic plan is to use the net proceeds for general corporate purposes, which may include supporting organic growth opportunities and future strategic transactions. The accompanying Unaudited Consolidated Financial Statements have been prepared by the Company without audit. In the opinion of management, all adjustments (which include only normal recurring adjustments) necessary to present fairly the Company’s financial position as of September 30, 2025 and its results of operations and changes in cash flows for the periods ended September 30, 2025 and 2024 have been made. The results of operations for the three and nine months ended September 30, 2025 are not necessarily indicative of the operating results for the full year. Reference is made to the accounting policies of the Company described in the notes to the Audited Consolidated Financial Statements contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024. The Company has consistently followed these policies in preparing this Quarterly Report on Form 10-Q, with the additions made to the accounting policy for derivatives to address derivatives designated as hedges, as described in Note 14.