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Significant Accounting Policies - Additional Information (Detail) - Maximum [Member]	6 Months Ended
	Jun. 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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X

- Definition

Percentage of impact on liabilities due to new accounting standard updates.

+ References

No definition available.

+ Details

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X

- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	civb_
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X

- Details

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