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Document And Entity Information - shares
 3 Months Ended
Mar. 31, 2020
May 13, 2020
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2020  
Document Fiscal Period Focus Q1  
Entity Registrant Name BANK OF THE JAMES FINANCIAL GROUP INC  
Entity File Number 001-35402  
Entity Incorporation, State or Country Code VA  
Entity Tax Identification Number 20-0500300  
Entity Address, Address Line One 828 Main Street  
Entity Address, City or Town Lynchburg  
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 24504  
City Area Code 434  
Local Phone Number 846-2000  
Document Fiscal Year Focus 2020  
Entity Central Index Key 0001275101  
Title of 12(b) Security Common Stock, 2.14 per share par value  
Trading Symbol BOTJ  
Security Exchange Name NASDAQ  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   4,339,436