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Capital Requirements and Restriction on Retained Earnings - Actual Capital Levels and Minimum Required Capital Levels (Detail) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Consolidated [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 429,080 | $ 395,125
Tier I Risk Based Capital, Actual, Amount | 318,322 | 293,164
CET1 Risk Based Capital, Actual, Amount | 288,895 | 263,736
Leverage, Actual, Amount | $ 318,322 | $ 293,164
Total Risk Based Capital, Actual, Ratio | 0.144 | 0.141
Tier I Risk Based Capital, Actual, Ratio | 0.107 | 0.104
CET1 Risk Based Capital, Actual, Ratio | 0.097 | 0.094
Leverage, Actual, Ratio | 0.088 | 0.087
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 237,604 | $ 217,681
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 178,203 | 163,261
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 133,652 | 122,446
Leverage, For Capital Adequacy Purposes, Amount | $ 145,489 | $ 131,479
Total Risk Based Capital , For Capital Adequacy Purposes, Ratio | 0.080 | 0.080
Tier I Risk Based Capital, For Capital Adequacy Purposes, Ratio | 0.060 | 0.060
CET1 Risk Based Capital, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, For Capital Adequacy Purposes, Ratio | 0.04 | 0.040
Civista [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 400,047 | $ 366,377
Tier I Risk Based Capital, Actual, Amount | 363,033 | 337,866
CET1 Risk Based Capital, Actual, Amount | 363,033 | 337,866
Leverage, Actual, Amount | $ 363,033 | $ 337,866
Total Risk Based Capital, Actual, Ratio | 0.135 | 0.129
Tier I Risk Based Capital, Actual, Ratio | 0.123 | 0.119
CET1 Risk Based Capital, Actual, Ratio | 0.123 | 0.119
Leverage, Actual, Ratio | 0.100 | 0.100
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 236,568 | $ 219,357
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 177,426 | 164,517
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 133,069 | 123,388
Leverage, For Capital Adequacy Purposes, Amount | $ 145,245 | $ 131,240
Total Risk Based Capital , For Capital Adequacy Purposes, Ratio | 0.080 | 0.080
Tier I Risk Based Capital, For Capital Adequacy Purposes, Ratio | 0.06 | 0.060
CET1 Risk Based Capital, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, For Capital Adequacy Purposes, Ratio | 0.040 | 0.040
Total Risk Based Capital , To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 295,710 | $ 274,196
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 236,568 | 219,357
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 192,211 | 178,227
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 181,556 | $ 164,050
Total Risk Based Capital , To Be Well Capitalized Under Prompt Corrective Action Purposes, Ratio | 0.100 | 0.100
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Ratio | 0.08 | 0.080
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Ratio | 6.50% | 6.50%
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Ratio | 0.050 | 0.050

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