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Fair Value of Assets and Liabilities - Financial Assets Measured at Fair Value on Non-Recurring Basis (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Impaired loans, net    
Fair value assets and liabilities - Nonrecurring Basis    
Total assets measured at fair value $ 0 $ 0
Other real estate owned, net    
Fair value assets and liabilities - Nonrecurring Basis    
Total assets measured at fair value $ 0  
Nonrecurring    
Fair value assets and liabilities - Nonrecurring Basis    
Total assets measured at fair value   72
Nonrecurring | Other real estate owned, net    
Fair value assets and liabilities - Nonrecurring Basis    
Total assets measured at fair value   72
Level 3 | Nonrecurring    
Fair value assets and liabilities - Nonrecurring Basis    
Total assets measured at fair value   72
Level 3 | Nonrecurring | Other real estate owned, net    
Fair value assets and liabilities - Nonrecurring Basis    
Total assets measured at fair value   $ 72
Other real estate owned, net, valuation technique   cffi:ValuationTechniqueAppraisalsMember
Other real estate owned, net, measurement input   us-gaap:MeasurementInputDiscountRateMember
Level 3 | Nonrecurring | Other real estate owned, net | Minimum    
Fair value assets and liabilities - Nonrecurring Basis    
Other real estate owned, input   0.75
Level 3 | Nonrecurring | Other real estate owned, net | Maximum    
Fair value assets and liabilities - Nonrecurring Basis    
Other real estate owned, input   0.80
Level 3 | Nonrecurring | Other real estate owned, net | Weighted Average    
Fair value assets and liabilities - Nonrecurring Basis    
Other real estate owned, input   0.79