CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance				$ (12,922)
AOCI - Ending Balance		$ (12,483)		(12,483)
Senior Management Security Plan
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Reclassifications		146	$ 837	439	$ 2,511
Reclassification out of Accumulated Other Comprehensive Income
Amortization of prior service cost	[1]	54	70	164	209
Amortization of net loss	[1]	143	1,057	428	3,172
Total reclassification, before tax - pension and postretirement benefits		197	1,127	592	3,381
Tax benefit	[2]	(51)	(290)	(153)	(870)
Reclassifications		146	837	439	2,511
Accumulated Defined Benefit Pension Items
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance		(12,629)	(38,366)	(12,922)	(40,040)
Reclassifications		146	837	439	2,511
AOCI - Ending Balance		(12,483)	(37,529)	(12,483)	(37,529)
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications		$ 146	$ 837	$ 439	$ 2,511

[1] Amortization of these items is included in IDACORP's condensed consolidated income statements in other operating expenses and in Idaho Power's condensed consolidated statements of income in other expense, net.

[2] The tax benefit is included in income tax expense in the condensed consolidated statements of income of both IDACORP and Idaho Power.