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Shareholders' Equity, Other Comprehensive Income and Earnings Per Common Share - Share Repurchase Program (Details) (Common, USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Common stock    
Shares repurchased 41,204us-gaap_StockRepurchasedDuringPeriodShares  
Repurchase Program    
Common stock    
Shares repurchased 38,759us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cffi_ShareRepurchaseProgramExpiringMay2015Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		  
Share repurchase program, maximum amount authorized to be repurchased 5.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= cffi_ShareRepurchaseProgramExpiringMay2015Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		  
Restricted Stock Tax Withholding Repurchases    
Common stock    
Shares repurchased 2,445us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cffi_ShareRepurchaseTaxWithholdingMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 225us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= cffi_ShareRepurchaseTaxWithholdingMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember