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Summary of Significant Accounting Policies - Nature of Operations and Subordinated Notes (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 06, 2025
USD ($)
Sep. 30, 2025
Jun. 30, 2025
USD ($)
subsidiary
Nature of Operations and Subordinated Notes      
Repayments of long-term borrowings     $ 20,000
Subordinated Notes | The Notes      
Nature of Operations and Subordinated Notes      
Aggregate principal amount $ 40,000    
Fixed rate (as a percent) 7.50%    
Term year 5 years    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] cffi:ThreeMonthSecuredOvernightFinancingRateMember    
Variable rate, basis spread (as a percent) 3.885%    
Subordinated Notes | 2030 Subordinated Notes      
Nature of Operations and Subordinated Notes      
Fixed rate (as a percent) 4.875%    
Repayments of long-term borrowings $ 20,000    
Repurchased price of outstanding principal amount 100.00%    
Subordinated Notes | 2030 Subordinated Notes | Subsequent event      
Nature of Operations and Subordinated Notes      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   cffi:ThreeMonthSecuredOvernightFinancingRateMember  
Variable rate, basis spread (as a percent)   4.755%  
C&F Bank      
Nature of Operations and Subordinated Notes      
Number of wholly owned subsidiaries | subsidiary     5
C&F Mortgage | C&F Select LLC      
Nature of Operations and Subordinated Notes      
Interest owned (as a percent)     51.00%