XML 72 R61.htm IDEA: XBRL DOCUMENT
v3.22.4

Adoption of New Accounting Standards (Details) - ASU 2022-03 $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2022 USD ($)
Adoption of New Accounting Standards |
Other income | $ 2.7
Other income net of tax | $ 2.2

X
- Definition Amount of other income net of tax. + References No definition available. + Details
Name: | cffi_OtherIncomeNetOfTax
Namespace Prefix: | cffi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue and income classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
Name: | us-gaap_OtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=cffi_AccountingStandardsUpdate202203Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |