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Commitments and Contingent Liabilities - Corporation's Reserve for Unfunded Commitments for the Periods Indicated (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Commitments and Contingent Liabilities
Beginning balance	$ 1,650
Provision charged to operations	150	$ 149
Ending balance	1,800	1,650
Impact of ASC 326
Commitments and Contingent Liabilities
Beginning balance	$ 1,501
Ending balance		$ 1,501

X

- Definition

The amount of provision for unfunded commitments.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of reserve for credit losses on unfunded commitments.

+ References

No definition available.

+ Details

Name:	cffi_ReserveForCreditLossesOnUnfundedCommitments
Namespace Prefix:	cffi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: