XML 150 R121.htm IDEA: XBRL DOCUMENT v3.20.4

Commitments, Contingencies and Off-Balance-Sheet Risk - Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	$ 39,095,000	$ 15,784,000
Variable Rate	470,557,000	434,578,000
Lines of Credit and Construction Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	38,474,000	15,155,000
Variable Rate	427,864,000	396,516,000
Overdraft Protection [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	6,000	5,000
Variable Rate	41,707,000	37,286,000
Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	615,000	624,000
Variable Rate	$ 986,000	$ 776,000

X

- Definition

Concentration risk credit risk financial instruments off balance sheet risk asset at fixed rate.

+ References

No definition available.

+ Details

Name:	civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate
Namespace Prefix:	civb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Concentration risk credit risk financial instruments off balance sheet risk asset at variable rate.

+ References

No definition available.

+ Details

Name:	civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate
Namespace Prefix:	civb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_CreditFacilityAxis=civb_LinesOfCreditAndConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=civb_OverdraftProtectionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: