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Capital Requirements and Restriction on Retained Earnings - Actual Capital Levels and Minimum Required Capital Levels (Detail) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Consolidated [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 394,164 | $ 307,504
Tier I Risk Based Capital, Actual, Amount | 295,064 | 283,459
CET1 Risk Based Capital, Actual, Amount | 265,637 | 254,032
Leverage, Actual, Amount | $ 295,064 | $ 283,459
Total Risk Based Capital, Actual, Ratio | 19.2 | 16.0
Tier I Risk Based Capital, Actual, Ratio | 14.3 | 14.7
CET1 Risk Based Capital, Actual, Ratio | 12.9 | 13.2
Leverage, Actual, Ratio | 10.2 | 10.8
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 164,498 | $ 153,810
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 123,373 | 115,358
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 92,530 | 86,518
Leverage, For Capital Adequacy Purposes, Amount | $ 115,543 | $ 105,279
Total Risk Based Capital , For Capital Adequacy Purposes, Ratio | 8.0 | 8.0
Tier I Risk Based Capital, For Capital Adequacy Purposes, Ratio | 6.0 | 6.0
CET1 Risk Based Capital, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, For Capital Adequacy Purposes, Ratio | 4.0 | 4.0
Civista [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 338,383 | $ 277,429
Tier I Risk Based Capital, Actual, Amount | 312,671 | 252,304
CET1 Risk Based Capital, Actual, Amount | 312,671 | 241,891
Leverage, Actual, Amount | $ 312,671 | $ 252,304
Total Risk Based Capital, Actual, Ratio | 16.5 | 14.4
Tier I Risk Based Capital, Actual, Ratio | 15.2 | 13.1
CET1 Risk Based Capital, Actual, Ratio | 15.2 | 12.6
Leverage, Actual, Ratio | 10.8 | 9.6
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 164,483 | $ 153,765
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 123,362 | 115,323
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 92,522 | 86,493
Leverage, For Capital Adequacy Purposes, Amount | $ 115,408 | $ 105,029
Total Risk Based Capital , For Capital Adequacy Purposes, Ratio | 8.0 | 8.0
Tier I Risk Based Capital, For Capital Adequacy Purposes, Ratio | 6.0 | 6.0
CET1 Risk Based Capital, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, For Capital Adequacy Purposes, Ratio | 4.0 | 4.0
Total Risk Based Capital , To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 205,604 | $ 192,206
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 164,483 | 153,765
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 133,642 | 124,934
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 144,260 | $ 131,286
Total Risk Based Capital , To Be Well Capitalized Under Prompt Corrective Action Purposes, Ratio | 10.0 | 10.0
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Ratio | 8.0 | 8.0
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 | 5.0 | 5.0

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