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Allowance for Loan Losses - Loans by Credit Quality Indicators - Performing and Non-Performing (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 835,804us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 820,384us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Consumer Finance    
Financing Receivable, Recorded Investment [Line Items]    
Loans 283,333us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cffi_ConsumerFinanceMember		 277,724us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cffi_ConsumerFinanceMember
Consumer Finance | Performing    
Financing Receivable, Recorded Investment [Line Items]    
Loans 282,293us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cffi_ConsumerFinanceMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 276,537us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cffi_ConsumerFinanceMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Consumer Finance | Nonperforming    
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 1,040us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cffi_ConsumerFinanceMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 $ 1,187us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cffi_ConsumerFinanceMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember