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Business Segments - Merger Related Expenses and Segment Debt (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Segments |  |  |
Merger related expenses | $ 709,000 | $ 0 | $ 0
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) | 50.00% |  |
Mortgage Banking | FHLB Advances | Maximum |  |  |
Business Segments |  |  |
Variable rate, spread (as a percent) | 175.00% |  |
Consumer Finance | Minimum |  |  |
Business Segments |  |  |
Variable rate, spread (as a percent) | 2.00% |  |
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 expenses | $ 709,000 |  |
Merger related expenses, after income taxes | 653,000 |  |
Peoples Bankshares, Incorporated (Peoples) | Retail Banking |  |  |
Business Segments |  |  |
Merger related expenses | 236,000 |  |
Merger related expenses, after income taxes | $ 196,000 |  |

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- 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
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Namespace Prefix: | cffi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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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- 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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- Details
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- Details
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