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Condensed Statements of Income- Parent Company Only (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Operating Expenses [Abstract]      
Interest on subordinated notes $ 4,425 $ 4,431 $ 4,442
Interest on long-term debt 1,967 2,428 2,810
Income before income taxes 41,418 27,443 29,786
Income tax benefits (8,858) (3,393) (5,649)
Net income 32,560 24,050 24,137
Parent Company [Member]      
Operating Income      
Equity in net income of West Bank 37,811 29,614 30,055
Equity in net income of West Bancorporation Capital Trust I 47 53 52
Total operating income 37,858 29,667 30,107
Operating Expenses [Abstract]      
Interest on subordinated notes 4,425 4,431 4,442
Interest on long-term debt 1,853 2,313 2,695
Other expenses 625 613 657
Total operating expenses 6,903 7,357 7,794
Income before income taxes 30,955 22,310 22,313
Income tax benefits 1,605 1,740 1,824
Net income $ 32,560 $ 24,050 $ 24,137