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Commitments and Contingent Liabilities - Changes in Allowance for Indemnifications Losses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in the allowance for indemnification losses |  |  |
Net reversal of provision for indemnification losses | $ (585,000) | $ (858,000) | $ (104,000)
Indemnification reserve for recourse provisions |  |  |
Change in the allowance for indemnification losses |  |  |
Allowance, beginning of period | 2,394,000 | 3,252,000 |
Net reversal of provision for indemnification losses | (585,000) | (858,000) |
Allowance, end of period | $ 1,809,000 | $ 2,394,000 | $ 3,252,000

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- Definition Amount of expense related to estimated loss for indemnifications. + References No definition available. + Details
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Namespace Prefix: | cffi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-10 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |