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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets (Detail) (Core Deposit and Other Intangibles [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Core Deposit and Other Intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 7,697 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = civb_CoreDepositsAndOtherIntangibleAssetsMember | $ 9,378 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = civb_CoreDepositsAndOtherIntangibleAssetsMember
Accumulated Amortization | $ 5,306 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = civb_CoreDepositsAndOtherIntangibleAssetsMember | $ 7,287 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = civb_CoreDepositsAndOtherIntangibleAssetsMember

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- Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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