SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 1,270,289	$ 1,282,524	$ 1,246,214
Operating income	282,097	253,696	291,742
Other income	25,905	21,554	29,440
Interest income	3,039	2,705	2,431
Earnings Losses of Unconsolidated Equity-Method Investments	11,128	12,372	11,939
Interest expense	81,934	79,801	81,032
Income before income taxes	240,235	210,526	254,520
Income tax expense (benefit)	45,760	16,772	72,226
Income attributable to IDACORP, Inc.	194,475	193,754	182,294
Income attributable to IDACORP, Inc.	194,679	193,480	182,417
Total assets	6,023,314	5,701,037	5,347,380
Expenditures for long-lived assets	294,021	274,094	246,674
PaymentsToAcquirePropertyPlantAndEquipment,Net	278,957		235,310
Idaho Power Company
Segment Reporting Information [Line Items]
Revenues	1,267,505	1,278,651	1,243,098
Operating income	282,252	253,437	291,691
Other income	25,868	21,517	29,288
Interest income	3,037	2,705	2,426
Earnings Losses of Unconsolidated Equity-Method Investments	9,773	10,814	10,242
Interest expense	81,718	79,570	80,646
Income before income taxes	239,211	208,903	253,001
Income tax expense (benefit)	48,228	19,516	76,260
Income attributable to IDACORP, Inc.	190,983	189,387	176,741
Total assets	5,968,835	5,604,506	5,249,228
Expenditures for long-lived assets	278,905	273,911	235,306
All Other Segments [Member]
Segment Reporting Information [Line Items]
Revenues	2,784	3,873	3,116
Operating income	(155)	259	51
Other income	37	37	152
Interest income	64	34	44
Earnings Losses of Unconsolidated Equity-Method Investments	1,355	1,558	1,697
Interest expense	278	265	425
Income before income taxes	1,024	1,623	1,519
Income tax expense (benefit)	(2,468)	(2,744)	(4,034)
Income attributable to IDACORP, Inc.	3,696	4,093	5,676
Total assets	71,704	109,044	109,541
Expenditures for long-lived assets	52	183	4
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0
Operating income	0	0	0
Other income	0	0	0
Interest income	(62)	(34)	(39)
Earnings Losses of Unconsolidated Equity-Method Investments	0	0	0
Interest expense	(62)	(34)	(39)
Income before income taxes	0	0	0
Income tax expense (benefit)	0	0	0
Income attributable to IDACORP, Inc.	0	0	0
Total assets	(17,225)	(12,513)	(11,389)
Expenditures for long-lived assets	$ 0	$ 0	$ 0