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Commitments and Contingent Liabilities - Corporation's Reserve for Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Commitments and Contingent Liabilities
Balance at the beginning of period	$ 1,750	$ 1,550	$ 1,800	$ 1,650
Provision charged to operations		150	(50)	50
Total	$ 1,750	$ 1,700	$ 1,750	$ 1,700

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

- References

No definition available.

+ Details

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