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Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 25, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 317,424,991
Entity Common Stock, Shares Outstanding   16,940,785  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE

The definitive proxy statement of West Bancorporation, Inc., which will be filed on or before March 3, 2026, is incorporated by reference into Part III hereof to the extent indicated in such Part.
    
Current Fiscal Year End Date --12-31    
Entity Central Index Key 0001166928    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Firm ID 49    
Auditor Name RSM US LLP    
Auditor Location Des Moines, Iowa    
Document Financial Statement Error Correction [Flag] false    
NoInsiderTradingFlag true