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Merger - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 06, 2015 | Dec. 31, 2014 | Mar. 05, 2015
Net assets acquired: |  |  |  |
Goodwill | $ 26,841 us-gaap_Goodwill |  | $ 21,720 us-gaap_Goodwill |
Cash acquired in acquisition | 926 us-gaap_CashAcquiredFromAcquisition |  |  |
TCNB Financial Corp [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total purchase price |  | 17,226 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Net assets acquired: |  |  |  |
Cash and short-term investments |  | 18,152 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Loans, net |  | 76,830 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  | 76,771 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember
Other securities |  | 716 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Premises and equipment |  | 1,739 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Accrued interest receivable |  | 194 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Goodwill |  | 5,121 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  | 5,121 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember
Core deposit intangible |  | 1,009 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Other assets |  | 1,265 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Noninterest-bearing deposits |  | (18,263)civb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonInterestBearingDeposits / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Interest-bearing deposits |  | (68,606)civb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDeposits / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Other liabilities |  | (5)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Net assets acquired |  | 18,152 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |
Cash acquired in acquisition |  | $ 926 us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of financial assets (as defined) recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -Glossary Financial Asset -URI http://asc.fasb.org/extlink&oid=6512957 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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