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Summary of Significant Accounting Policies - Nature of Operations and Significant Group Concentration of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2020 subsidiary
Individual State Concentration Risk | Investment concentration risk | Obligations of states and political subdivisions
Concentration risk
Concentration risk, percentage	16.80%
Individual State Concentration Risk | Investment concentration risk | Obligations of states and political subdivisions | Minimum
Concentration risk
Concentration risk, threshold percentage	10.00%
Category of loan concentration risk | Loan Portfolio Concentration Risk | Commercial, financial and agricultural
Concentration risk
Concentration risk, percentage	51.80%
Category of loan concentration risk | Loan Portfolio Concentration Risk | Non-prime consumer finance loans
Concentration risk
Concentration risk, percentage	19.80%
C&F Bank
Concentration risk
Number of wholly owned subsidiaries	5
C&F Mortgage | C&F Select LLC
Concentration risk
Interest owned (as a percent)	51.00%

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The threshold used to measure concentration risk for disclosure in the financial statements.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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