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SHARE-BASED COMPENSATION Share-based Compensation Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award      
Percent of target award, minimum 0.00%    
Shares awarded to directors 10,296 9,594 12,950
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) $ 10,500,000 $ 9,400,000 $ 8,300,000
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 10,296    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 95.23    
Deferred shares (in shares) 2,276    
Restricted stock plan | IDACORP      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation cost $ 5,900,000    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 107.16    
Restricted stock plan | Idaho Power Company      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation cost $ 5,800,000    
Shares granted - weighted average grant-date fair value (in dollars per share) $ 107.17    
Share-based Payment Arrangement [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Maximum shares outstanding (in shares) 552,913    
Vesting period of performance-based awards 3 years