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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2018
Mar. 22, 2019
Jun. 30, 2018
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2018    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2018    
Entity Registrant Name BANK OF THE JAMES FINANCIAL GROUP INC    
Entity Central Index Key 0001275101    
Entity Small Business true    
Entity Emerging Growth Company false    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   4,378,436  
Entity Public Float     $ 64,727,398
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer No    
Entity Shell Company false