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Securities - Restricted Stocks and others (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Securities
Investment in restricted stock	$ 1,030,000.00
Investment in restricted stocks	1,027,000	$ 1,636,000
Restricted stocks, other-than-temporary impairment	$ 0

X

- Definition

The amount of restricted stocks which include Federal Home Loan Bank (FHLB) stock and Community Bankers Bank (CBB) stock owned.

+ References

No definition available.

+ Details

Name:	cffi_RestrictedStocks
Namespace Prefix:	cffi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents an other than temporary decline in value of restricted stocks.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions.

+ References

No definition available.

+ Details

Name:	us-gaap_RestrictedInvestmentsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant