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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, 2017
Dec. 31, 2016
Consolidated [Member]    
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]    
Total Risk Based Capital, Actual, Amount $ 200,772 $ 155,145
Tier I Risk Based Capital, Actual, Amount 187,638 141,840
CET1 Risk Based Capital, Actual, Amount 140,853 93,463
Leverage, Actual, Amount $ 187,638 $ 141,840
Total Risk Based Capital, Actual, Ratio 16.60% 14.20%
Tier I Risk Based Capital, Actual, Ratio 15.50% 13.00%
CET1 Risk Based Capital, Actual, Ratio 11.60% 8.60%
Leverage, Actual, Ratio 12.70% 10.60%
Total Risk Based Capital , For Capital Adequacy Purposes, Amount $ 97,025 $ 87,436
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount 72,769 65,577
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount 54,576 49,183
Leverage, For Capital Adequacy Purposes, Amount $ 59,089 $ 53,774
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 $ 161,394 $ 145,270
Tier I Risk Based Capital, Actual, Amount 147,473 131,391
CET1 Risk Based Capital, Actual, Amount 136,760 120,465
Leverage, Actual, Amount $ 147,473 $ 131,391
Total Risk Based Capital, Actual, Ratio 13.30% 13.30%
Tier I Risk Based Capital, Actual, Ratio 12.20% 12.00%
CET1 Risk Based Capital, Actual, Ratio 11.30% 11.00%
Leverage, Actual, Ratio 10.00% 9.80%
Total Risk Based Capital , For Capital Adequacy Purposes, Amount $ 96,880 $ 87,334
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount 72,660 65,501
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount 54,495 49,126
Leverage, For Capital Adequacy Purposes, Amount $ 59,031 $ 53,717
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 $ 121,100 $ 109,168
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount 96,880 87,334
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount 78,715 70,959
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount $ 73,788 $ 67,146
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%