Consolidated Financial Statements	6 Months Ended
Jun. 30, 2020
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 subsidiaries: Civista Bank (Civista), First Citizens Insurance Agency, Inc. (FCIA), Water Street Properties, Inc. (Water St.) and CIVB Risk Management, Inc. (CRMI). CRMI is a wholly-owned captive insurance company which allows the Company to insure against certain risks unique to the operations of CBI and its subsidiaries. The operations of CRMI are located in Wilmington, Delaware. First Citizens Capital LLC (FCC) is wholly-owned by Civista and holds inter-company debt. The operations of FCC are located in Wilmington, Delaware. First Citizens Investments, Inc. (FCI) is wholly-owned by Civista and holds and manages its securities portfolio. The operations of FCI are located in Wilmington, Delaware. FCIA was formed to allow the Company to participate in commission revenue generated through its third party insurance agreement. Insurance commission revenue was less than 1.0% of total revenue through June 30, 2020. Water Street Properties was formed to hold properties repossessed by CBI subsidiaries. Revenue from Water St. was less than 1.0% of total revenue through June 30, 2020. The above companies together are 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. The 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 June 30, 2020 and its results of operations and changes in cash flows for the periods ended June 30, 2020 and 2019 have been made. The accompanying Consolidated Financial Statements have been prepared in accordance with instructions of Form 10-Q, and therefore certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America have been omitted. The results of operations for the periods ended June 30, 2020 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 financial statements contained in the Company’s 2019 annual report. The Company has consistently followed these policies in preparing this Form 10-Q. The Company provides financial services through its offices in the Ohio counties of Erie, Crawford, Champaign, Franklin, Logan, Madison, Summit, Huron, Ottawa, Richland, Montgomery and Cuyahoga, 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. Civista has two loan concentrations, one is to Lessors of Non-Residential Buildings and Dwellings totaling $491,544, or 24.1% of total loans, as of June 30, 2020, and the other is to Lessors of Residential Buildings and Dwellings totaling $222,089, or 10.9% of total loans, as of June 30, 2020. These segments of the loan portfolio have been conservatively underwritten, monitored and managed by experienced commercial bankers. However, the customers’ ability to repay their loans is dependent on the real estate market and general economic conditions in the area. Other financial instruments that potentially represent concentrations of credit risk include deposit accounts in other financial institutions that are in excess of federally insured limits.

Consolidated Financial Statements

6 Months Ended

Jun. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

(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 subsidiaries: Civista Bank (Civista), First Citizens Insurance Agency, Inc. (FCIA), Water Street Properties, Inc. (Water St.) and CIVB Risk Management, Inc. (CRMI). CRMI is a wholly-owned captive insurance company which allows the Company to insure against certain risks unique to the operations of CBI and its subsidiaries. The operations of CRMI are located in Wilmington, Delaware. First Citizens Capital LLC (FCC) is wholly-owned by Civista and holds inter-company debt. The operations of FCC are located in Wilmington, Delaware. First Citizens Investments, Inc. (FCI) is wholly-owned by Civista and holds and manages its securities portfolio. The operations of FCI are located in Wilmington, Delaware. FCIA was formed to allow the Company to participate in commission revenue generated through its third party insurance agreement. Insurance commission revenue was less than 1.0% of total revenue through June 30, 2020. Water Street Properties was formed to hold properties repossessed by CBI subsidiaries. Revenue from Water St. was less than 1.0% of total revenue through June 30, 2020. The above companies together are 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.

The 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 June 30, 2020 and its results of operations and changes in cash flows for the periods ended June 30, 2020 and 2019 have been made. The accompanying Consolidated Financial Statements have been prepared in accordance with instructions of Form 10-Q, and therefore certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America have been omitted. The results of operations for the periods ended June 30, 2020 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 financial statements contained in the Company’s 2019 annual report. The Company has consistently followed these policies in preparing this Form 10-Q.

The Company provides financial services through its offices in the Ohio counties of Erie, Crawford, Champaign, Franklin, Logan, Madison, Summit, Huron, Ottawa, Richland, Montgomery and Cuyahoga, 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. Civista has two loan concentrations, one is to Lessors of Non-Residential Buildings and Dwellings totaling $491,544, or 24.1% of total loans, as of June 30, 2020, and the other is to Lessors of Residential Buildings and Dwellings totaling $222,089, or 10.9% of total loans, as of June 30, 2020. These segments of the loan portfolio have been conservatively underwritten, monitored and managed by experienced commercial bankers. However, the customers’ ability to repay their loans is dependent on the real estate market and general economic conditions in the area. Other financial instruments that potentially represent concentrations of credit risk include deposit accounts in other financial institutions that are in excess of federally insured limits.