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Capital Requirements and Restriction on Retained Earnings - Actual Capital Levels and Minimum Required Capital Levels (Detail) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Consolidated [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 395,125 | $ 394,164
Tier I Risk Based Capital, Actual, Amount | 293,164 | 295,064
CET1 Risk Based Capital, Actual, Amount | 263,736 | 265,637
Leverage, Actual, Amount | $ 293,164 | $ 295,064
Total Risk Based Capital, Actual, Ratio | 0.145 | 0.192
Tier I Risk Based Capital, Actual, Ratio | 0.108 | 0.143
CET1 Risk Based Capital, Actual, Ratio | 0.097 | 0.129
Leverage, Actual, Ratio | 0.089 | 0.102
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 217,681 | $ 164,498
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 163,261 | 123,373
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 122,446 | 92,530
Leverage, For Capital Adequacy Purposes, Amount | $ 131,479 | $ 115,543
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 | 0.040
Civista [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 366,377 | $ 338,383
Tier I Risk Based Capital, Actual, Amount | 337,866 | 312,671
CET1 Risk Based Capital, Actual, Amount | 337,866 | 312,671
Leverage, Actual, Amount | $ 337,866 | $ 312,671
Total Risk Based Capital, Actual, Ratio | 0.134 | 0.165
Tier I Risk Based Capital, Actual, Ratio | 0.123 | 0.152
CET1 Risk Based Capital, Actual, Ratio | 0.123 | 0.152
Leverage, Actual, Ratio | 0.103 | 0.108
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 219,357 | $ 164,483
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 164,517 | 123,362
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 123,388 | 92,522
Leverage, For Capital Adequacy Purposes, Amount | $ 131,240 | $ 115,408
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 | 0.040
Total Risk Based Capital , To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 274,196 | $ 205,604
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 219,357 | 164,483
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 178,227 | 133,642
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 164,050 | $ 144,260
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 | 0.080
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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