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Capital Requirements and Restriction on Retained Earnings - Actual Capital Levels and Minimum Required Capital Levels (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Consolidated [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 260,531 | $ 200,772
Tier I Risk Based Capital, Actual, Amount | 246,852 | 187,638
CET1 Risk Based Capital, Actual, Amount | 208,061 | 140,853
Leverage, Actual, Amount | $ 246,852 | $ 187,638
Total Risk Based Capital, Actual, Ratio | 16.10% | 16.60%
Tier I Risk Based Capital, Actual, Ratio | 15.30% | 15.50%
CET1 Risk Based Capital, Actual, Ratio | 12.90% | 11.60%
Leverage, Actual, Ratio | 12.80% | 12.70%
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 129,080 | $ 97,025
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 96,810 | 72,769
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 72,608 | 54,576
Leverage, For Capital Adequacy Purposes, Amount | $ 80,788 | $ 59,089
Total Risk Based Capital , For Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier I Risk Based Capital, For Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
CET1 Risk Based Capital, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, For Capital Adequacy Purposes, Ratio | 4.00% | 4.00%
Civista [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 228,620 | $ 161,394
Tier I Risk Based Capital, Actual, Amount | 213,922 | 147,473
CET1 Risk Based Capital, Actual, Amount | 203,441 | 136,760
Leverage, Actual, Amount | $ 213,922 | $ 147,473
Total Risk Based Capital, Actual, Ratio | 14.20% | 13.30%
Tier I Risk Based Capital, Actual, Ratio | 13.30% | 12.20%
CET1 Risk Based Capital, Actual, Ratio | 12.60% | 11.30%
Leverage, Actual, Ratio | 10.60% | 10.00%
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 128,918 | $ 96,880
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 96,689 | 72,660
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 72,517 | 54,495
Leverage, For Capital Adequacy Purposes, Amount | $ 80,642 | $ 59,031
Total Risk Based Capital , For Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier I Risk Based Capital, For Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
CET1 Risk Based Capital, For Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, For Capital Adequacy Purposes, Ratio | 4.00% | 4.00%
Total Risk Based Capital , To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 161,407 | $ 121,100
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 129,125 | 96,880
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 104,914 | 78,715
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 100,802 | $ 73,788
Total Risk Based Capital , To Be Well Capitalized Under Prompt Corrective Action Purposes, Ratio | 10.00% | 10.00%
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Ratio | 8.00% | 8.00%
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 | 5.00% | 5.00%

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