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Commitments and Contingent Liabilities - Other (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Commitments and Contingent Liabilities
Provision for indemnifications		$ (583)
Indemnification reserve for recourse provisions
Commitments and Contingent Liabilities
Provision for indemnifications	$ 0	(583)
Indemnification payments paid	0	$ 0
Loss Contingency Accrual	$ 2,390		$ 2,390
C&F Mortgage
Commitments and Contingent Liabilities
Recourse period for early payment default, minimum	90 days
Recourse period for early payment default, maximum	1 year

X

- Definition

The amount of cash outflow for indemnification.

+ References

No definition available.

+ Details

Name:	cffi_IndemnificationPayments
Namespace Prefix:	cffi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of expense related to estimated loss for indemnifications.

+ References

No definition available.

+ Details

Name:	cffi_ProvisionForLossOnIndemnification
Namespace Prefix:	cffi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The maximum recourse period for residential mortgage loans sold to third parties.

+ References

No definition available.

+ Details

Name:	cffi_RecoursePeriodForEarlyPaymentDefaultMaximum
Namespace Prefix:	cffi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The minimum recourse period for early payment default on residential loans sold to third parties.

+ References

No definition available.

+ Details

Name:	cffi_RecoursePeriodForEarlyPaymentDefaultMinimum
Namespace Prefix:	cffi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14615-108349

+ Details

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

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=cffi_CFMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: