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Commitments and Contingent Liabilities - Other (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Commitments and Contingent Liabilities
Provision for indemnification losses	$ (583)	$ 17
Mortgage Banking
Commitments and Contingent Liabilities
Recourse period for early payment default, minimum	90 days
Recourse period for early payment default, maximum	1 year
Indemnification reserve for recourse provisions | Mortgage Banking
Commitments and Contingent Liabilities
Provision for indemnification losses	$ 583	17
Indemnification payments paid	0	$ 0
Allowance for indemnifications	$ 2,670		$ 3,250

X

- Definition

The amount of cash outflow for indemnification.

+ References

No definition available.

+ Details

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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

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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

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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://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

- Details

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

X

- Details

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Namespace Prefix:
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