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v3.21.2

Securities - Restricted Stocks and others (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Securities |  |
Investment in restricted stock | $ 1,030,000.00 |
Investment in restricted stocks | 1,027,000 | $ 1,636,000
Restricted stocks, other-than-temporary impairment | $ 0 |

X
- Definition The amount of restricted stocks which include Federal Home Loan Bank (FHLB) stock and Community Bankers Bank (CBB) stock owned. + References No definition available. + Details
Name: | cffi_RestrictedStocks
Namespace Prefix: | cffi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents an other than temporary decline in value of restricted stocks. + References No definition available. + Details
Name: | cffi_RestrictedStocksOtherThanTemporaryImpairment
Namespace Prefix: | cffi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
Name: | us-gaap_RestrictedInvestmentsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant