INCOME TAXES: Components of Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income taxes current:
Federal	$ 8,830	$ 5,390	$ 11,726
State	4,865	3,328	5,418
Total	13,695	8,718	17,144
Income taxes deferred:
Federal	9,486	1,649	24,018
State	1,159	30	(154)
Total	10,645	1,679	23,864
Investment tax credits:
Deferred	8,268	8,334	10,506
Restored	(6,252)	(2,929)	(3,081)
Total	2,016	5,405	7,425
Affordable housing investments	(1,849)	1,584	227
Total income tax expense	24,507	17,386	48,660
Idaho Power Company
Income taxes current:
Federal	25,338	24,919	51,575
State	(4,392)	(2,049)	10,562
Total	20,946	22,870	62,137
Income taxes deferred:
Federal	(4,599)	(15,388)	(13,002)
State	10,054	5,425	(5,298)
Total	5,455	(9,963)	(18,300)
Investment tax credits:
Deferred	8,268	8,334	10,506
Restored	(6,252)	(2,929)	(3,081)
Total	2,016	5,405	7,425
Affordable housing investments	0	0	0
Total income tax expense	$ 28,417	$ 18,312	$ 51,262