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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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