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Capital Requirements and Restriction on Retained Earnings - Actual Capital Levels and Minimum Required Capital Levels (Detail)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Consolidated [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Risk Based Capital, Actual, Amount $ 307,504,000 $ 285,268,000
Tier I Risk Based Capital, Actual, Amount 283,459,000 270,501,000
CET1 Risk Based Capital, Actual, Amount 254,032,000 241,074,000
Leverage, Actual, Amount $ 283,459,000 $ 270,501,000
Total Risk Based Capital, Actual, Ratio 16.0 16.1
Tier I Risk Based Capital, Actual, Ratio 14.7 15.3
CET1 Risk Based Capital, Actual, Ratio 13.2 13.6
Leverage, Actual, Ratio 10.8 12.3
Total Risk Based Capital , For Capital Adequacy Purposes, Amount $ 153,810,000 $ 141,506,000
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount 115,358,000 106,129,000
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount 86,518,000 79,597,000
Leverage, For Capital Adequacy Purposes, Amount $ 105,279,000 $ 87,652,000
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 $ 277,429,000 $ 250,920,000
Tier I Risk Based Capital, Actual, Amount 252,304,000 235,094,000
CET1 Risk Based Capital, Actual, Amount 241,891,000 224,653,000
Leverage, Actual, Amount $ 252,304,000 $ 235,094,000
Total Risk Based Capital, Actual, Ratio 14.4 14.2
Tier I Risk Based Capital, Actual, Ratio 13.1 13.3
CET1 Risk Based Capital, Actual, Ratio 12.6 12.7
Leverage, Actual, Ratio 9.6 10.8
Total Risk Based Capital , For Capital Adequacy Purposes, Amount $ 153,765,000 $ 141,445,000
Tier I Risk Based Capital, For Capital Adequacy Purposes, Amount 115,323,000 106,084,000
CET1 Risk Based Capital, For Capital Adequacy Purposes, Amount 86,493,000 79,563,000
Leverage, For Capital Adequacy Purposes, Amount $ 105,029,000 $ 87,362,000
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 $ 192,206,000 $ 176,807,000
Tier I Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount 153,765,000 141,445,000
CET1 Risk Based Capital, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount 124,934,000 114,924,000
Leverage, To Be Well Capitalized Under Prompt Corrective Action Purposes, Amount $ 131,286,000 $ 109,203,000
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