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Consolidated Financial Statements - Additional Information (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($) Dwelling Segment
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Number of loan concentration by bank to lessors and owners of Residential Buildings and Dwellings | Dwelling | 2
Number of reportable segment | Segment | 1
Non Residential Buildings and Dwellings [Member] |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Amount payable to lessors | $ 301,003
Amount payable to lessors in percentage | 25.40%
Residential Buildings and Dwellings [Member] |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Amount payable to lessors | $ 147,497
Amount payable to lessors in percentage | 12.50%
Maximum [Member] |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Percentage of insurance commission revenue of total revenue | 1.00%
Maximum [Member] | WSP [Member] |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Percentage of insurance commission revenue of total revenue | 1.00%

X
- Definition Amount payable to lessors in respect of default on rental obligation. + References No definition available. + Details
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Namespace Prefix: | civb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
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X
- Definition Number of concentration by bank to lessors and owners of residential buildings and dwellings. + References No definition available. + Details
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Namespace Prefix: | civb_
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Period Type: | duration

X
- Definition Percentage of amount payable to lessors. + References No definition available. + Details
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Period Type: | duration

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- Definition Percentage of insurance commission revenue of total revenue. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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X
- Details
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Balance Type: |
Period Type: |

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: |

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- Details
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Period Type: |