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Employee Benefit Plans - Defined Contribution Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined contribution plans      
Vesting Threshold Age 65 years    
Profit-Sharing Plan | The Bank      
Defined contribution plans      
Minimum age 18 years    
Required service period 3 months    
Vested percentage after 2 years of service 20.00%    
Vested percentage after 3 years of service 40.00%    
Vested percentage after 4 years of service 60.00%    
Vested percentage after 5 years of service 80.00%    
Fully vested period 6 years    
Amounts charged to expense $ 799 $ 653 $ 633
Profit-Sharing Plan | C&F Finance      
Defined contribution plans      
Amounts charged to expense $ 223 239 211
401(k) Savings Plan | The Bank      
Defined contribution plans      
Maximum deferral as a percent of compensation 95.00%    
401(k) Savings Plan | C&F Mortgage      
Defined contribution plans      
Minimum age 18 years    
Vested percentage after 2 years of service 25.00%    
Vested percentage after 3 years of service 50.00%    
Vested percentage after 4 years of service 75.00%    
Fully vested period 5 years    
Amounts charged to expense $ 216 163 59
401(k) Savings Plan | C&F Mortgage | Minimum      
Defined contribution plans      
Maximum deferral as a percent of compensation 1.00%    
401(k) Savings Plan | C&F Mortgage | Maximum      
Defined contribution plans      
Maximum deferral as a percent of compensation 100.00%    
Postretirement benefit plan | Chief Executive Officer      
Defined contribution plans      
Amounts charged to expense $ 81 75 69
Management Incentive Plan      
Defined contribution plans      
Amounts charged to expense 1,700 1,440 1,500
Employment Agreements | C&F Mortgage      
Defined contribution plans      
Amounts charged to expense 759 780 338,000,000
Nonqualified Executive Plan | Profit-Sharing Plan      
Defined contribution plans      
Amounts charged to expense $ 253 $ 268 $ 226