CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance		$ (12,922)
Reclassifications		146	$ 837
AOCI - Ending Balance		(12,776)
Reclassification out of Accumulated Other Comprehensive Income
Amortization of prior service cost	[1]	55	70
Amortization of net loss	[1]	142	1,057
Total reclassification, before tax - pension and postretirement benefits		197	1,127
Tax benefit	[2]	(51)	(290)
Reclassifications		146	837
Accumulated Defined Benefit Pension Items
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance		(12,922)	(40,040)
Reclassifications		146	837
AOCI - Ending Balance		(12,776)	(39,203)
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications		$ 146	$ 837

[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.