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Commitments and Financial Instruments with Off-Balance-Sheet Risk - IRLC and Other Derivatives (Details) (USD $)
3 Months Ended
Mar. 31, 2015
C&F Mortgage  
Commitments and Financial Instruments with Off-Balance Sheet Risk  
Recourse period for early payment default, minimum 90 days
Recourse period for early payment default, maximum 1 year
Forward sales commitments  
Commitments and Financial Instruments with Off-Balance Sheet Risk  
Notional amount 104,380,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cffi_ForwardSalesCommitmentsMember
Derivative asset 723,000us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= cffi_ForwardSalesCommitmentsMember