Schedule I - Condensed Financial Information of Parent - Income Statement Schedule I Level 4 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income:
Equity in income of subsidiaries	$ (328)	$ 798	$ 3,008
Operating Income	242,602	155,352	191,811
Expenses:
Operating expenses	838,060	871,404	844,218
Interest Expense	73,869	71,526	75,114
Other expenses	(4,209)	(4,621)	(5,473)
Income Before Income Taxes	195,047	114,729	141,729
Income Tax Benefit	26,113	(52,133)	(731)
Net income attributable to IDACORP, Inc.	168,761	166,693	142,798
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	163,440	164,808	141,159
Comprehensive Income Attributable to IDACORP, Inc.	163,267	164,639	141,497
IDACORP
Income:
Equity in income of subsidiaries	168,591	166,716	143,414
Investment income (losses)	295	161	602
Operating Income	168,886	166,877	144,016
Expenses:
Operating expenses	473	1,011	1,130
Interest Expense	511	534	1,023
Other expenses	45	0	57
Total expenses	1,029	1,545	2,210
Income Before Income Taxes	167,857	165,332	141,806
Income Tax Benefit	(904)	(1,361)	(992)
Net income attributable to IDACORP, Inc.	168,761	166,693	142,798
Other comprehensive income	(5,494)	(2,054)	(1,301)
Comprehensive Income Attributable to IDACORP, Inc.	$ 163,267	$ 164,639	$ 141,497