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Equity Incentive Plan - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based compensation - Civista BOD | $ 531 | $ 428 | $ 426 |
Expected future compensation expense | $ 498 |  |  |
Weighted average remaining life of grants related to unvested awards not yet recognized | 2 years 3 months |  |  |
Civista Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted common shares granted | 8,946 | 7,071 | 7,171 |
Share based compensation - Civista BOD | $ 196 | $ 165 | $ 152 |
Restricted Stock [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares vesting service period | 3 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 | 240,001 |  |  |
Options granted | 0 | 0 |  |
Share based compensation expense | $ 335 | $ 263 | 274 |
Director retainer fees | 196 | $ 165 | $ 152 |
Expected future compensation expense | $ 498 |  |  |
Weighted average remaining life of grants related to unvested awards not yet recognized | 2 years 3 months |  |  |

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