v3.25.3
Cover Page - shares
9 Months Ended
Sep. 30, 2025
Oct. 22, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 0-49677  
Entity Registrant Name WEST BANCORPORATION, INC.  
Entity Incorporation, State or Country Code IA  
Entity Tax Identification Number 42-1230603  
Entity Address, Address Line One 3330 Westown Parkway  
Entity Address, City or Town West Des Moines  
Entity Address, State or Province IA  
Entity Address, Postal Zip Code 50266  
City Area Code (515)  
Local Phone Number 222-2300  
Title of 12(b) Security Common stock, no par value  
Trading Symbol WTBA  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   16,940,785
Entity Central Index Key 0001166928  
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31