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Equity Incentive Plan - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares vesting service period | 3 years |  |  |
Share based compensation - Civista BOD | $ 984 | $ 819 | $ 702 |
Expected future compensation expense | $ 1,104 |  |  |
Weighted average remaining life of grants related to unvested awards not yet recognized | 2 years 18 days |  |  |
Civista Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted common shares granted | 11,817 | 8,098 | 8,792 |
Share based compensation - Civista BOD | $ 189 | $ 196 | $ 196 |
2014 Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares under stock option plan authorized for issuance |  |  |  | 375,000
Number of shares available for grant under stock option plan | 60,049 |  |  |
Options granted | 0 | 0 |  |
Share based compensation expense | $ 801 | $ 630 | 506 |
Expected future compensation expense | $ 1,104 |  |  |
Weighted average remaining life of grants related to unvested awards not yet recognized | 2 years 18 days |  |  |
2014 Incentive Plan [Member] | Civista Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Director retainer fees | $ 182 | $ 189 | $ 196 |

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