SEGMENT INFORMATION: Level 4 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information
Revenues	$ 372,045	$ 369,165	$ 968,437	$ 984,889
Net Income Attributable to IDACORP, Inc.	83,017	73,267	164,934	162,802
Net Income Attributable to IDACORP, Inc.	83,100	73,336	165,075	162,847
Total assets	6,129,109		6,129,109		$ 6,023,314
Idaho Power Company
Segment Reporting Information
Revenues	371,474	368,517		982,612
Net Income Attributable to IDACORP, Inc.	80,029	71,727	160,370	159,528
Total assets	6,068,358		6,068,358
All Other
Segment Reporting Information
Revenues		648	1,986	2,277
Net Income Attributable to IDACORP, Inc.	3,071	1,609	4,705	3,319
Total assets	82,872		82,872
Eliminations
Segment Reporting Information
Revenues	0	0	0	0
Net Income Attributable to IDACORP, Inc.	0	0	0	0
Total assets	(22,121)		$ (22,121)
Idaho Power Company
Segment Reporting Information
IERCo's ownership percentage in Bridger Coal Company			33.00%
Net Income Attributable to IDACORP, Inc.	80,029	$ 71,727	$ 160,370	$ 159,528
Total assets	$ 6,068,358		$ 6,068,358		$ 5,968,835