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Loans - Troubled Debt Restructurings (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) loan	Mar. 31, 2020 USD ($) loan
Loans
Number of Loans | loan	1	1
Recorded Investment	$ 4,000	$ 84,000
TDR payment default period	12 months
Period determining when a past due TDR becomes a subsequent default	90 days
Recorded Investment, TDR payment defaults	$ 0	$ 0

X

- Definition

The period of time after the original troubled debt modification within which a subsequent default is defined to occur if a full or partial charge-off occurs.

+ References

No definition available.

+ Details

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Namespace Prefix:	cffi_
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Balance Type:	na
Period Type:	duration

X

- Definition

The period of time after the restructured troubled debt becomes past due used to define a subsequent default.

+ References

No definition available.

+ Details

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Namespace Prefix:	cffi_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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X

- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration