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Capital Requirements and Restriction on Retained Earnings - Actual Capital Levels and Minimum Required Capital Levels (Detail) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Consolidated [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 456,499 | $ 429,080
Tier I Risk Based Capital, Actual, Amount | 341,811 | 318,322
CET1 Risk Based Capital, Actual, Amount | 312,384 | 288,895
Leverage, Actual, Amount | $ 341,811 | $ 318,322
Total Risk Based Capital, Actual, Ratio | 0.139 | 0.144
Tier I Risk Based Capital, Actual, Ratio | 0.104 | 0.107
CET1 Risk Based Capital, Actual, Ratio | 0.095 | 0.097
Leverage, Actual, Ratio | 0.086 | 0.088
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 261,904 | $ 237,604
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 196,428 | 178,203
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 147,321 | 133,652
Leverage, For Capital Adequacy Purposes, Amount | $ 158,679 | $ 145,489
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 | 0.040 | 0.04
Civista [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 420,363 | $ 400,047
Tier I Risk Based Capital, Actual, Amount | 379,447 | 363,033
CET1 Risk Based Capital, Actual, Amount | 379,447 | 363,033
Leverage, Actual, Amount | $ 379,447 | $ 363,033
Total Risk Based Capital, Actual, Ratio | 0.129 | 0.135
Tier I Risk Based Capital, Actual, Ratio | 0.116 | 0.123
CET1 Risk Based Capital, Actual, Ratio | 0.116 | 0.123
Leverage, Actual, Ratio | 0.096 | 0.100
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 261,693 | $ 236,568
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 196,270 | 177,426
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 147,202 | 133,069
Leverage, For Capital Adequacy Purposes, Amount | $ 157,823 | $ 145,245
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 | 0.06
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 | $ 327,116 | $ 295,710
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 261,693 | 236,568
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 212,626 | 192,211
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 197,278 | $ 181,556
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 | 0.080 | 0.08
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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