CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance		$ (40,040)
Reclassifications		837	$ 836
AOCI - Ending Balance		(39,203)
Reclassification out of Accumulated Other Comprehensive Income
Amortization of prior service cost	[1]	70	74
Amortization of net loss	[1]	1,057	1,051
Total reclassification, before tax - pension and postretirement benefits		1,127	1,125
Tax benefit	[2]	(290)	(289)
Reclassifications		837	836
Accumulated Defined Benefit Pension Items
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance		(40,040)	(43,358)
Reclassifications		837	836
AOCI - Ending Balance		(39,203)	(42,522)
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications		$ 837	$ 836

[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.