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Significant Accounting Policies - Additional Information (Detail) - Maximum [Member] | 9 Months Ended
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Sep. 30, 2017
Significant Accounting Policies [Line Items] |
Percentage of increase on assets due to new accounting standard updates | 1.00%
Percentage of increase on liabilities due to new accounting standard updates | 1.00%

X
- Definition Percentage of impact on assets due to new accounting standard updates. + References No definition available. + Details
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Namespace Prefix: | civb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of impact on liabilities due to new accounting standard updates. + References No definition available. + Details
Name: | civb_PercentageOfImpactOnLiabilitiesDueToNewAccountingStandardUpdates
Namespace Prefix: | civb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | civb_SignificantAccountingPoliciesLineItems
Namespace Prefix: | civb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |