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Commitments and Contingent Liabilities - Changes in Allowance for Indemnifications Losses (Details) - Indemnification reserve for recourse provisions - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Change in the allowance for indemnification losses |  |
Allowance, beginning of period | $ 3,356,000 | $ 2,475,000
Provision for indemnification losses | (104,000) | 881,000
Allowance, end of period | $ 3,252,000 | $ 3,356,000

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + 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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |