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Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 Security | Dec. 31, 2014
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Amortized Cost and Fair Value Debt Securities [Abstract] |  |
Carrying value of pledged securities | $ 142,329 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | $ 137,898 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Number of securities in portfolio with unrealized losses | 27 civb_NumberOfSecuritiesInPortfolioWithUnrealizedLosses |

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- Details
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Namespace Prefix: | civb_
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Balance Type: | na
Period Type: | duration

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- Definition Total number of securities in the portfolio with unrealized losses. + References No definition available. + Details
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Namespace Prefix: | civb_
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- 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=35738203&loc=d3e5086-111524 + Details
Name: | us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
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Balance Type: | debit
Period Type: | instant