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Stock Compensation Plans Restricted Stock Unit Activity (Details) - West Bancorporation, Inc. 2012 Equity Incentive Plan [Member] - Restricted stock units (RSUs) [Member] - Common stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock compensation plan [Line Items]        
Stock compensation plan, restricted stock, nonvested (number of shares) 261,833 179,699 130,337 66,793
Stock compensation plan, restricted stock, nonvested, weighted average grant date fair value ($ per share) $ 16.67 $ 13.39 $ 10.50 $ 9.74
Stock compensation plan, restricted stock, grants in period (number of shares) 139,500 104,750 77,500  
Stock compensation plan, restricted stock, grants in period, weighted average grant date fair value ($ per share) $ 19.59 $ 15.30 $ 11.10  
Stock compensation plan, restricted stock, vested in period (number of shares) (57,366) (55,388) (13,956)  
Stock compensation plan, restricted stock, vested in period, weighted average grant date fair value ($ per share) $ 13.23 $ 10.20 $ 10.17  
Stock compensation plan, restricted stock, forfeited in period (number of shares) 0 0 0  
Stock compensation plan, restricted stock, forfeitures, weighted average grant date fair value ($ per share) $ 0.00 $ 0.00 $ 0.00