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Commitments and Contingent Liabilities - Other (Details) - C&F Mortgage | 12 Months Ended
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Dec. 31, 2019
Commitments and Contingent Liabilities |
Recourse period for early payment default, minimum | 90 days
Recourse period for early payment default, maximum | 1 year

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- 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

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- 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

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- 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_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=cffi_CFMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |