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Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Maximum [Member] |
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%
Retained Earnings [Member] |
Significant Accounting Policies [Line Items] |
Change in accounting principle for adoption of ASU 2016-01 | $ 278
Accumulated Other Comprehensive Loss [Member] |
Significant Accounting Policies [Line Items] |
Change in accounting principle for adoption of ASU 2016-01 | $ (278)

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

X
- Definition Percentage of impact on liabilities 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

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

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |