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Adoption of New Accounting Standards (Details) (ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, Qualified Affordable Housing Projects, USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Adoption of New Accounting Standards    
Carrying value of aggregate investment $ 2,750,000us-gaap_EquityMethodInvestments  
Aggregate commitment 1,260,000cffi_QualifiedAffordableHousingProjectInvestmentsCommitment  
Income tax expense (benefit)
   
Adoption of New Accounting Standards    
Amortization recogized $ 138,000cffi_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= cffi_AccountingStandardsUpdate201401Member
/ us-gaap_IncomeStatementLocationAxis
= cffi_IncomeTaxExpenseBenefitMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= cffi_QualifiedAffordableHousingProjectsMember
$ 104,000cffi_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= cffi_AccountingStandardsUpdate201401Member
/ us-gaap_IncomeStatementLocationAxis
= cffi_IncomeTaxExpenseBenefitMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= cffi_QualifiedAffordableHousingProjectsMember