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Allowance for Credit Losses - Provision for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Allowance for Credit Losses |  |  |  |
Provision for loans | $ 1,401 | $ 530 | $ 3,351 | $ 202
Provision for unfunded commitments | 299 |  | 399 |
Total | $ 1,700 | $ 530 | $ 3,750 | $ 202

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

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

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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration