Schedule I - Condensed Financial Information of Parent - Income Statement Schedule I Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income:
Equity in income of subsidiaries	$ 12,370	$ 12,449	$ 11,374
Operating Income	298,326	296,922	315,545
Expenses:
Operating expenses	1,048,057	1,073,830	1,033,941
Interest expense	86,475	85,948	83,746
Other expenses	(6,502)	2,867	2,109
Income Before Income Taxes	257,835	244,909	261,848
Income Tax Expense	24,507	17,386	48,660
Net Income Attributable to IDACORP, Inc.	232,854	226,801	212,419
Comprehensive Income Attributable to IDACORP, Inc.	219,414	234,921	206,429
IDACORP
Income:
Equity in income of subsidiaries	231,534	226,567	211,974
Investment income	2,214	865	26
Operating Income	233,748	227,432	212,000
Expenses:
Operating expenses	816	668	708
Interest expense	831	713	294
Other expenses	30	0	30
Total expenses	1,677	1,381	1,032
Income Before Income Taxes	232,071	226,051	210,968
Income Tax Expense	(783)	(750)	(1,451)
Net Income Attributable to IDACORP, Inc.	232,854	226,801	212,419
Other comprehensive (loss) income	(13,440)	8,120	(5,990)
Comprehensive Income Attributable to IDACORP, Inc.	$ 219,414	$ 234,921	$ 206,429