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Summary of Significant Accounting Policies - Business Combination and Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
C&F Bank
Cash and cash equivalents
Minimum cash requirement	$ 0	$ 1,030

X

- Definition

The minimum average cash balance which the entity is required to maintain on hand or with the Federal Reserve Bank.

+ References

No definition available.

+ Details

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

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

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

X

- Details

Name:	dei_LegalEntityAxis=cffi_CAndFBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: