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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Assets Measured at Fair Value on a Nonrecurring Basis [Member] - Impaired Loans [Member] - (Level 3) [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$ 1,803	$ 29
Valuation Technique [Extensible List]	civb:AppraisalOfCollateralMember	civb:AppraisalOfCollateralMember
Minimum [Member] | Measurement Input, Appraised Value
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Unobservable Input	0	10
Minimum [Member] | Measurement Input Liquidation Expense [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Unobservable Input	0
Minimum [Member] | Measurement Input Holding Period
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Term	0 months
Maximum [Member] | Measurement Input, Appraised Value
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Unobservable Input	30	30
Maximum [Member] | Measurement Input Liquidation Expense [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Unobservable Input	10
Maximum [Member] | Measurement Input Holding Period
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Term	30 months
Weighted Average [Member] | Measurement Input, Appraised Value
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Unobservable Input	26	26
Weighted Average [Member] | Measurement Input Liquidation Expense [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Unobservable Input	8
Weighted Average [Member] | Measurement Input Holding Period
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans, Term	21 months

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+ References

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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- Definition

Value of input used to measure servicing asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-SubTopic 10
-Section 50
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