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Commitments, Contingencies and Off-Balance-Sheet Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Maximum period of commitments to make loans	1 year
Maximum time period of maturities	30 years
Average reserve balance under Federal Reserve Board requirements	$ 21,019civb_AverageReserveBalanceUnderFederalReserveBoardRequirements	$ 3,259civb_AverageReserveBalanceUnderFederalReserveBoardRequirements
Minimum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Range of fixed interest rate loan commitments	3.05%civb_RangeOfFixedInterestRateLoanCommitments / us-gaap_RangeAxis = us-gaap_MinimumMember	3.05%civb_RangeOfFixedInterestRateLoanCommitments / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Range of fixed interest rate loan commitments	8.75%civb_RangeOfFixedInterestRateLoanCommitments / us-gaap_RangeAxis = us-gaap_MaximumMember	8.75%civb_RangeOfFixedInterestRateLoanCommitments / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Average reserve balance under federal reserve board requirements.

+ References

No definition available.

+ Details

Name:	civb_AverageReserveBalanceUnderFederalReserveBoardRequirements
Namespace Prefix:	civb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Maximum credit commitments maturities period description.

+ References

No definition available.

+ Details

Name:	civb_CreditCommitmentsMaturitiesPeriod
Namespace Prefix:	civb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum period to commit loan description.

+ References

No definition available.

+ Details

Name:	civb_MaximumPeriodToCommitLoan
Namespace Prefix:	civb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Range of fixed interest rate loan commitments.

+ References

No definition available.

+ Details

Name:	civb_RangeOfFixedInterestRateLoanCommitments
Namespace Prefix:	civb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: