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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, 2016 | Dec. 31, 2015
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Consolidated [Member] |  |
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 155,145 | $ 140,088
Tier I Risk Based Capital, Actual, Amount | 141,840 | 127,519
CET1 Risk Based Capital, Actual, Amount | 93,463 | 75,819
Leverage, Actual, Amount | $ 141,840 | $ 127,519
Total Risk Based Capital, Actual, Ratio | 14.20% | 14.00%
Tier I Risk Based Capital, Actual, Ratio | 13.00% | 12.70%
CET1 Risk Based Capital, Actual, Ratio | 8.60% | 7.60%
Leverage, Actual, Ratio | 10.60% | 10.00%
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 87,436 | $ 80,050
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 65,577 | 60,245
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 49,183 | 44,893
Leverage, For Capital Adequacy Purposes, Amount | $ 53,774 | $ 51,008
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 for Mortgage Companies [Line Items] |  |
Total Risk Based Capital, Actual, Amount | $ 145,270 | $ 126,795
Tier I Risk Based Capital, Actual, Amount | 131,391 | 113,883
CET1 Risk Based Capital, Actual, Amount | 120,465 | 102,755
Leverage, Actual, Amount | $ 131,391 | $ 113,883
Total Risk Based Capital, Actual, Ratio | 13.30% | 12.70%
Tier I Risk Based Capital, Actual, Ratio | 12.00% | 11.40%
CET1 Risk Based Capital, Actual, Ratio | 11.00% | 10.10%
Leverage, Actual, Ratio | 9.80% | 8.90%
Total Risk Based Capital , For Capital Adequacy Purposes, Amount | $ 87,334 | $ 79,871
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount | 65,501 | 59,938
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount | 49,126 | 45,782
Leverage, For Capital Adequacy Purposes, Amount | $ 53,717 | $ 51,183
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 | $ 109,168 | $ 99,839
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 87,334 | 79,918
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | 70,959 | 66,129
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount | $ 67,146 | $ 63,979
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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