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Business Segments - Merger Related Expenses and Segment Debt (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Segments |  |  |
Merger related costs | $ 898,000 | $ 709,000 | $ 0
Aggregated merger related costs | $ 2,100,000 |  |
Mortgage Banking |  |  |
Business Segments |  |  |
Number of intersegment lines of credit | item | 2 |  |
Mortgage Banking | FHLB Advances | Minimum |  |  |
Business Segments |  |  |
Variable rate, spread (as a percent) | 0.50% |  |
Mortgage Banking | FHLB Advances | Maximum |  |  |
Business Segments |  |  |
Variable rate, spread (as a percent) | 1.75% |  |
Consumer Finance |  |  |
Business Segments |  |  |
Floor variable rate (as a percent) | 3.50% |  |
Consumer Finance | Minimum |  |  |
Business Segments |  |  |
Variable rate, spread (as a percent) | 2.40% |  |
Consumer Finance | Maximum |  |  |
Business Segments |  |  |
Variable rate, spread (as a percent) | 8.00% |  |
Consumer Finance | London Interbank Offered Rate (LIBOR) | Minimum |  |  |
Business Segments |  |  |
Variable rate, spread (as a percent) | 2.00% |  |
Peoples Bankshares, Incorporated (Peoples) |  |  |
Business Segments |  |  |
Merger related costs | $ 1,400,000 | 709,000 |
Merger related costs, after income taxes | 1,130,000 | 653,000 |
Peoples Bankshares, Incorporated (Peoples) | Community Banking |  |  |
Business Segments |  |  |
Merger related costs | 1,300,000 | 236,000 |
Merger related costs, after income taxes | 1,030,000.00 | $ 196,000 |
Peoples Bankshares, Incorporated (Peoples) | Community Banking | Salaries and benefits expense |  |  |
Business Segments |  |  |
Merger related costs | 119,000 |  |
Peoples Bankshares, Incorporated (Peoples) | Community Banking | Other noninterest expense |  |  |
Business Segments |  |  |
Merger related costs | 879,000 |  |
Peoples Bankshares, Incorporated (Peoples) | Community Banking | Other noninterest income |  |  |
Business Segments |  |  |
Merger related costs | $ 298,000 |  |

X
- Definition This element represents acquisition-related costs, after income taxes, incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References No definition available. + Details
Name: | cffi_BusinessCombinationAcquisitionRelatedCostsAfterIncomeTaxes
Namespace Prefix: | cffi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on borrowing from another operating segment of the reporting entity. + References No definition available. + Details
Name: | cffi_IntersegmentInterestDebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix: | cffi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Floor variable rate of borrowing from another operating segment of the reporting entity. + References No definition available. + Details
Name: | cffi_IntersegmentInterestDebtInstrumentFloorVariableRate
Namespace Prefix: | cffi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of intersegment lines of credit. + References No definition available. + Details
Name: | cffi_NumberOfIntersegmentLinesOfCredit
Namespace Prefix: | cffi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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Balance Type: | debit
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
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- Details
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- Details
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- Details
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Data Type: | na
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- Details
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- Details
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- Details
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