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Securities - Additional Information (Detail) $ in Thousands	Sep. 30, 2016 USD ($) Security	Dec. 31, 2015 USD ($)
Investments, Debt and Equity Securities [Abstract]
Carrying value of pledged securities | $	$ 156,087	$ 142,888
Number of securities in portfolio with unrealized losses | Security	19

X

- Definition

Total number of securities in the portfolio with unrealized losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	civb_
Data Type:	xbrli:integerItemType
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X

- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5086-111524

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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