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Commitments and Contingent Liabilities - Changes in Allowance for Indemnifications Losses (Details) - Indemnification reserve for recourse provisions - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Change in the allowance for indemnification losses
Allowance, beginning of period	$ 3,356,000	$ 2,475,000
Provision for indemnification losses	(104,000)	881,000
Allowance, end of period	$ 3,252,000	$ 3,356,000

X

- Definition

Amount of expense related to estimated loss for indemnifications.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: