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Securities - Restricted Stocks (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Securities
Investment in restricted stock	$ 3,260
Restricted stocks, other-than-temporary impairment	$ 0

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