v2.3.0.9
DOCUMENT AND ENTITY INFORMATION
9 Months Ended
Sep. 30, 2011
Nov. 14, 2011
Entity Registrant Name POTOMAC BANCSHARES INC  
Entity Central Index Key 0000925173  
Current Fiscal Year End Date --12-31  
Entity Filer Category Smaller Reporting Company  
Trading Symbol ptbs  
Entity Common Stock, Shares Outstanding   3,390,178
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2011
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2011