Condensed Consolidated Statements of Equity $ in Thousands	USD ($)
Balance at beginning of period at Dec. 31, 2017	$ 857,207
Common Stock
Allocated Share-based Compensation Expense	5,411
Treasury Stock Issued	(3,007)
Other common stock changes	41
Balance at end of period at Jun. 30, 2018	859,652
Balance at beginning of period at Dec. 31, 2017	1,426,528
Retained Earnings
Net Income Attributable to IDACORP, Inc.	98,430
Common stock dividends	(59,949)
Balance at end of period at Jun. 30, 2018	1,465,009
AOCI - Beginning Balance at Dec. 31, 2017	(30,964)
Accumulated Other Comprehensive (Loss) Income
Unfunded pension liability adjustment, net of tax	1,443
AOCI - Ending Balance at Jun. 30, 2018	(29,521)
Balance at beginning of period at Dec. 31, 2017	(1,386)
Treasury Stock
Issued	3,007
Acquired	(3,557)
Balance at end of period at Jun. 30, 2018	(1,936)
Balance at beginning of period at Dec. 31, 2017	4,729
Noncontrolling Interests
Adjustment for loss attributable to noncontrolling interests	274
Balance at end of period at Jun. 30, 2018	5,003
Balance at beginning of period at Mar. 31, 2018	857,533
Common Stock
Allocated Share-based Compensation Expense	2,870
Treasury Stock Issued	(770)
Other common stock changes	19
Balance at end of period at Jun. 30, 2018	859,652
Balance at beginning of period at Mar. 31, 2018	1,432,584
Retained Earnings
Net Income Attributable to IDACORP, Inc.	62,288
Common stock dividends	(29,863)
Balance at end of period at Jun. 30, 2018	1,465,009
AOCI - Beginning Balance at Mar. 31, 2018	(30,243)
Accumulated Other Comprehensive (Loss) Income
Unfunded pension liability adjustment, net of tax	722
AOCI - Ending Balance at Jun. 30, 2018	(29,521)
Balance at beginning of period at Mar. 31, 2018	(2,706)
Treasury Stock
Issued	770
Acquired	0
Balance at end of period at Jun. 30, 2018	(1,936)
Balance at beginning of period at Mar. 31, 2018	4,698
Noncontrolling Interests
Adjustment for loss attributable to noncontrolling interests	305
Balance at end of period at Jun. 30, 2018	5,003
Treasury Stock
Total IDACORP, Inc. shareholders’ equity at end of period	2,293,204
Noncontrolling Interests
Total equity at end of period	2,298,207
Total IDACORP, Inc. shareholders’ equity at end of period	2,370,360
Total equity at end of period	2,375,811
Balance at beginning of period at Dec. 31, 2018	863,593
Common Stock
Allocated Share-based Compensation Expense	4,667
Treasury Stock Issued	(4,047)
Other common stock changes	53
Balance at end of period at Jun. 30, 2019	864,266
Balance at beginning of period at Dec. 31, 2018	1,531,543
Retained Earnings
Net Income Attributable to IDACORP, Inc.	95,842
Common stock dividends	(63,986)
Balance at end of period at Jun. 30, 2019	1,563,399
AOCI - Beginning Balance at Dec. 31, 2018	(22,844)
Accumulated Other Comprehensive (Loss) Income
Unfunded pension liability adjustment, net of tax	976
AOCI - Ending Balance at Jun. 30, 2019	(21,868)
Balance at beginning of period at Dec. 31, 2018	(1,932)
Treasury Stock
Issued	4,047
Acquired	(4,107)
Balance at end of period at Jun. 30, 2019	(1,992)
Balance at beginning of period at Dec. 31, 2018	5,451
Noncontrolling Interests
Adjustment for loss attributable to noncontrolling interests	195
Balance at end of period at Jun. 30, 2019	5,646
Balance at beginning of period at Mar. 31, 2019	863,425
Common Stock
Allocated Share-based Compensation Expense	1,830
Treasury Stock Issued	(1,016)
Other common stock changes	27
Balance at end of period at Jun. 30, 2019	864,266
Balance at beginning of period at Mar. 31, 2019	1,542,175
Retained Earnings
Net Income Attributable to IDACORP, Inc.	53,156
Common stock dividends	(31,932)
Balance at end of period at Jun. 30, 2019	1,563,399
AOCI - Beginning Balance at Mar. 31, 2019	(22,356)
Accumulated Other Comprehensive (Loss) Income
Unfunded pension liability adjustment, net of tax	488
AOCI - Ending Balance at Jun. 30, 2019	(21,868)
Balance at beginning of period at Mar. 31, 2019	(3,008)
Treasury Stock
Issued	1,016
Acquired	0
Balance at end of period at Jun. 30, 2019	(1,992)
Balance at beginning of period at Mar. 31, 2019	5,402
Noncontrolling Interests
Adjustment for loss attributable to noncontrolling interests	244
Balance at end of period at Jun. 30, 2019	5,646
Treasury Stock
Total IDACORP, Inc. shareholders’ equity at end of period	2,403,805
Noncontrolling Interests
Total equity at end of period	$ 2,409,451