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Commitments, Contingencies and Off-Balance-Sheet Risk - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Maximum period of commitments to make loans | 1 year |
Maximum time period of maturities | 30 years |
Average reserve balance under Federal Reserve Board requirements | $ 4,112 | $ 2,887
Minimum [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Range of fixed interest rate loan commitments | 2.88% | 3.25%
Maximum [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Range of fixed interest rate loan commitments | 10.25% | 8.50%

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- Definition Average reserve balance under federal reserve board requirements. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Maximum credit commitments maturities period description. + References No definition available. + Details
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Namespace Prefix: | civb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum period to commit loan description. + References No definition available. + Details
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Namespace Prefix: | civb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Range of fixed interest rate loan commitments. + References No definition available. + Details
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Namespace Prefix: | civb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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