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NOTES PAYABLE: Level 4 (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Short-term borrowings:    
Commercial paper outstanding $ 5,400 $ 20,000
Weighted-average annual interest rate 0.86% 0.88%
IDACORP    
Short-term borrowings:    
Commercial paper outstanding $ 5,400 $ 20,000
Weighted-average annual interest rate 0.86% 0.88%
Credit facility:    
Amount outstanding on credit facility $ 0  
Idaho Power Company    
Short-term borrowings:    
Commercial paper outstanding $ 0 $ 0
Weighted-average annual interest rate 0.00% 0.00%
Credit facility:    
Amount outstanding on credit facility $ 0  
Regulatory authority to incur short-term indebtedness $ 450,000