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, 2014	Dec. 31, 2013	Dec. 31, 2012
Income:
Equity in income of subsidiaries	$ 12,372	$ 11,939	$ 11,617
Operating income	253,696	291,742	242,602
Expenses:
Operating expenses	1,028,828	954,472	838,060
Interest expense	79,801	81,032	73,869
Other expenses	(6,328)	(17,013)	(4,209)
Income Before Income Taxes	210,526	254,520	206,992
Income Tax Expense (Benefit)	16,772	72,226	33,805
Net income attributable to IDACORP, Inc.	193,480	182,417	173,014
Other comprehensive income (loss)	(7,605)	563	(5,494)
Comprehensive Income Attributable to IDACORP, Inc.	185,875	182,980	167,520
IDACORP
Income:
Equity in income of subsidiaries	193,707	182,463	172,844
Investment income (losses)	0	3	295
Operating income	193,707	182,466	173,139
Expenses:
Operating expenses	1,376	940	473
Interest expense	261	416	511
Other expenses	45	71	45
Total expenses	1,682	1,427	1,029
Income Before Income Taxes	192,025	181,039	172,110
Income Tax Expense (Benefit)	(1,455)	(1,378)	(904)
Net income attributable to IDACORP, Inc.	193,480	182,417	173,014
Other comprehensive income (loss)	(7,605)	563	(5,494)
Comprehensive Income Attributable to IDACORP, Inc.	$ 185,875	$ 182,980	$ 167,520