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Equity Incentive Plan - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 28, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expected future compensation expense |  | $ 992 |  | $ 992 |  |
Weighted average remaining life of grants related to unvested awards not yet recognized |  |  |  | 2 years 6 months 18 days |  |
Civista Director [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted common shares granted | 8,792 |  |  |  |  |
Share based compensation - Civista BOD | $ 196 |  |  |  |  |
Restricted Stock [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares vesting service period |  |  |  | 3 years |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares vesting service period |  |  |  | 5 years |  |
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 |  | 151,892 |  | 151,892 |  |
Options granted |  |  |  | 0 | 0 |
Share based compensation expense |  | $ 132 | $ 99 | $ 392 | $ 322 |
Expected future compensation expense |  | $ 922 |  | $ 922 |  |
Weighted average remaining life of grants related to unvested awards not yet recognized |  |  |  | 2 years 6 months 18 days |  |
2014 Incentive Plan [Member] | Civista Director [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation - Civista BOD |  |  |  | $ 196 |  |

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