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Commitments and Contingent Liabilities - Corporation's Reserve for Unfunded Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Commitments and Contingent Liabilities |  |  |  |
Balance at the beginning of period | $ 1,750 | $ 1,700 | $ 1,800 | $ 1,650
Provision charged to operations | (100) |  | (150) | 50
Total | $ 1,650 | $ 1,700 | $ 1,650 | $ 1,700

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- Definition The amount of provision for unfunded commitments. + References No definition available. + Details
Name: | cffi_ProvisionForUnfundedCommitments
Namespace Prefix: | cffi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of reserve for credit losses on unfunded commitments. + References No definition available. + Details
Name: | cffi_ReserveForCreditLossesOnUnfundedCommitments
Namespace Prefix: | cffi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration