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SHARE-BASED COMPENSATION Share-based Compensation Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award      
Percent of target award, minimum 0.00%    
Shares awarded to directors 9,594 12,950 12,050
Equity compensation costs capitalized $ 0    
Restricted stock plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period of restricted stock awards 3 years    
Percent of target award, minimum 0.00% 0.00% 0.00%
Percent of target award, maximum 200.00% 200.00% 200.00%
Total fair value of shares vested (in shares) $ 9,400 $ 8,300 $ 7,500
Period over which unrecognized compensation cost will be recognized (in years) 1 year 8 months 14 days 14 hours 24 minutes    
Restricted stock plan | Directors      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares awarded to directors 9,594    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 98.41    
Deferred shares (in shares) 3,198    
Restricted stock plan | IDACORP      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation cost $ 7,900    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 92.58    
Restricted stock plan | Idaho Power Company      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation cost $ 7,800    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 92.59    
Share-based Payment Arrangement [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Maximum shares outstanding (in shares) 613,394    
Vesting period of performance-based awards 3 years