XML 52 R41.htm IDEA: XBRL DOCUMENT v3.8.0.1

Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Maximum [Member]
Significant Accounting Policies [Line Items]
Percentage of increase on assets due to new accounting standard updates	1.00%
Percentage of increase on liabilities due to new accounting standard updates	1.00%
Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle for adoption of ASU 2016-01	$ 278
Accumulated Other Comprehensive Loss [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle for adoption of ASU 2016-01	$ (278)

X

- Definition

Percentage of impact on assets due to new accounting standard updates.

+ References

No definition available.

+ Details

Name:	civb_PercentageOfImpactOnAssetsDueToNewAccountingStandardUpdates
Namespace Prefix:	civb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of impact on liabilities due to new accounting standard updates.

+ References

No definition available.

+ Details

Name:	civb_PercentageOfImpactOnLiabilitiesDueToNewAccountingStandardUpdates
Namespace Prefix:	civb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

Name:	civb_SignificantAccountingPoliciesLineItems
Namespace Prefix:	civb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

No definition available.

+ Details

Name:	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: