Commitments and Contingent Liabilities - Loan Commitments and Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
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
Standby Letters of Credit | The Bank
Commitments and Financial Instruments with Off-Balance Sheet Risk
Face amount of asset	$ 19,340	$ 15,460
Loan Commitments | The Bank
Commitments and Financial Instruments with Off-Balance Sheet Risk
Face amount of asset	$ 244,170	$ 224,500