CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance				$ (12,922)
Reclassifications		$ 147	$ 837	293	$ 1,674
AOCI - Ending Balance		(12,629)		(12,629)
Reclassification out of Accumulated Other Comprehensive Income
Amortization of prior service cost	[1]	55	69	110	139
Amortization of net loss	[1]	143	1,058	285	2,115
Total reclassification, before tax - pension and postretirement benefits		198	1,127	395	2,254
Tax benefit	[2]	(51)	(290)	(102)	(580)
Reclassifications		147	837	293	1,674
Accumulated Defined Benefit Pension Items
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance		(12,776)	(39,203)	(12,922)	(40,040)
Reclassifications		147	837	293	1,674
AOCI - Ending Balance		(12,629)	(38,366)	(12,629)	(38,366)
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications		$ 147	$ 837	$ 293	$ 1,674

[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.